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Article

Unveiling Iso- and Aniso-Hydric Disparities in Grapevine—A Reanalysis by Transcriptome Portrayal Machine Learning

by
Tomas Konecny
1,2,*,†,
Armine Asatryan
1,3,†,
Maria Nikoghosyan
1,4 and
Hans Binder
1,2
1
Armenian Bioinformatics Institute, Yerevan 0014, Armenia
2
Interdisciplinary Centre for Bioinformatics, University of Leipzig, 04107 Leipzig, Germany
3
Group of Plant Genomics, Institute of Molecular Biology, National Academy of Sciences of Armenia, Yerevan 0014, Armenia
4
Bioinformatics Group, Institute of Molecular Biology, National Academy of Sciences of Armenia, Yerevan 0014, Armenia
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Plants 2024, 13(17), 2501; https://doi.org/10.3390/plants13172501
Submission received: 27 July 2024 / Revised: 2 September 2024 / Accepted: 4 September 2024 / Published: 6 September 2024

Abstract

:
Mechanisms underlying grapevine responses to water(-deficient) stress (WS) are crucial for viticulture amid escalating climate change challenges. Reanalysis of previous transcriptome data uncovered disparities among isohydric and anisohydric grapevine cultivars in managing water scarcity. By using a self-organizing map (SOM) transcriptome portrayal, we elucidate specific gene expression trajectories, shedding light on the dynamic interplay of transcriptional programs as stress duration progresses. Functional annotation reveals key pathways involved in drought response, pinpointing potential targets for enhancing drought resilience in grapevine cultivation. Our results indicate distinct gene expression responses, with the isohydric cultivar favoring plant growth and possibly stilbenoid synthesis, while the anisohydric cultivar engages more in stress response and water management mechanisms. Notably, prolonged WS leads to converging stress responses in both cultivars, particularly through the activation of chaperones for stress mitigation. These findings underscore the importance of understanding cultivar-specific WS responses to develop sustainable viticultural strategies in the face of changing climate.

Graphical Abstract

1. Introduction

Vitis vinifera, being a cornerstone in the global wine industry, faces unprecedented challenges in the era of climate change. Among these challenges, drought stands out as one of the pivotal factors causing water(-deficient) stress (WS), influencing grape ripening and overall fruit quality. As global temperatures rise and precipitation patterns become increasingly unpredictable, the study of WS in Vitis vinifera has become paramount for ensuring the resilience of vineyards and the sustainability of wine production.
Current climate change scenarios have brought about shifts in weather patterns, leading to prolonged periods of water scarcity and extreme climatic events. These changes pose a significant threat to viticulture, impacting grapevine physiology, grape quality, and wine production. WS, characterized by a deficiency in water availability relative to the plant’s demand, triggers a cascade of physiological responses in Vitis vinifera, affecting its growth, photosynthesis, and metabolic processes [1,2,3,4]. Notably, grapevines have evolved two distinct mechanisms, isohydric and anisohydric, to navigate the complex interplay between water availability and demand [5,6,7,8,9]. Isohydric cultivars regulate water potential by actively adjusting stomatal conductance, conserving water during limited availability, and prioritizing water status regulation over continuous carbon assimilation. Conversely, anisohydric cultivars maintain sustained carbon assimilation even under declining water availability, with a more permissive control over stomatal conductance [10,11,12]. While promoting growth and productivity, this strategy exposes grapevines to higher risks of hydraulic failure under severe water deficit situations [9,13,14].
The investigation of these isohydric and anisohydric mechanisms gains significance in deciphering the adaptive strategies of Vitis vinifera to varying water conditions [15,16,17]. The importance of such research is heightened by the need to develop resilient grape cultivars or drought-resistant rootstocks and implement sustainable viticultural practices in response to the changing climate.
Even though both isohydric and anisohydric mechanisms in different grapevine cultivars are well-known and studied at the transcriptomics level [15], current advancements in the field of artificial intelligence (AI) and machine learning (ML) and their applications in analyzing molecular biology data offer exciting possibilities. AI- and ML-powered analyses, particularly through techniques like self-organizing maps (SOM), have the potential to unlock a deeper understanding of the underlying mechanisms and biological pathways that occur at specific time points during stress treatments relevant to viticulture [18]. SOM is a type of artificial neural network that can visualize high-dimensional data like gene expression profiles. By analyzing transcriptomic data using SOM, hidden patterns and relationships between genes can be identified and visualized, enhancing understanding of the underlying mechanisms governing grapevine responses to abiotic stress conditions caused, for instance, by cold temperatures or by water limitation.
A previous study [15] delved into how grapevine transcriptomes respond to WS at the molecular level. The studied isohydric cultivar (‘Montepulciano’) exhibited a faster transcriptome response after WS imposition, with rapid modulation of genes related to abscisic acid (ABA), a stress response hormone, and quicker expression of heat-shock protein (HSP) genes. On the other hand, an anisohydric cultivar (‘Sangiovese’) displayed early and robust induction of reactive oxygen species (ROS)-scavenging enzymes, molecular chaperones, and abiotic-stress-related genes in response to deficiency of water. While this research provides valuable insights, it is important to recognize that the genes identified by significance analysis of microarrays (SAM) represent a portion of the grapevine’s response to WS [19]. Here, we apply SOM omics portrayal to these data to analyze the transcriptomic response of isohydric or anisohydric grapevines under water deficit conditions. SOM transcriptomics portrayal was developed to extract and interpret complex patterns from multidimensional transcriptomic data [20], and it has been applied recently to cold stress acting on Vitis vinifera and, particularly, to describe the transcriptomics trajectories of the grapevine plant under changing environmental conditions [18]. Our aim is to compare trajectories associated with drought response in the isohydric and anisohydric grapevine categories. We show that isohydric MP initially maintains a muted transcriptional response, prioritizing transcripts for normal growth (phloem development) before potentially shifting towards activation of stress response processes for survival. Conversely, anisohydric SG displays a rapid transcriptional response, initially focusing on stress alleviation (ketoreductase, arogenate) and water management (lignin catabolism, chitinase activity) before upregulating thiamin biosynthesis, a pathway potentially linked to broader abiotic stress tolerance. Despite their distinct genetic backgrounds related to water-use efficiency, both cultivars eventually converge toward shared responses under prolonged drought conditions.

2. Results

2.1. WS Influences Gene Expression Trajectories in Distinct Cultivars

“Drought” stresses the plants due to a hydric deficiency, i.e., the effect of water reserve (e.g., soil water deficit) defined as the difference between the maximum and the actual water availability (field capacity). The experimental setup of Dal Santo and colleagues modeled such (deficient) WS conditions to study physiological responses based on transcriptomic data [15]. They achieved it by comparing one isohydric and one anisohydric cultivar under well-watered and water-stressed conditions as a time series of three measurements in three biological replicates. Our SOM method provides “portrait” images of each of those 36 measurements, visualizing their individual transcriptome landscapes in terms of red overexpression and blue underexpression “spots” (Figure 1A). Note that SOM portrayal methods provide individual images of each sample, which visualize the expression landscape of nearly 30,000 single genes using a color code from blue (low expression) to dark red (high expression) for “spot”-like clusters of co-regulated genes. All images apply the same coordinate system of gene distribution, meaning that they can be directly compared and used for downstream analyses such as similarity and trajectory analysis as well as function mining by means of gene set enrichment analysis (see [20] for a detailed description of the method). Our focus remains on studying changing expression patterns under progressing WS. For an overview, we generated a pairwise correlation heatmap between all portraits. It revealed that the data separated between the two cultivars in terms of two distinct clusters of samples with similar expression patterns evident as dark-red squares reflecting positive correlations between them (Figure 1B). The small red quadrants along the diagonal refer to the similarities of the replicates, as expected. Interestingly, off-diagonal correlations were also observed referring to similarities between STRS and CTRL conditions at T1 and T2, between the two cultivars at T3, as well as to dissimilarities between time points T1 and T3 under WS conditions (see red and blue areas in Figure 1B, respectively). Independent component analysis (ICA) transforms the correlation matrix into a spatial distribution of the samples in the coordinate system of the first three independent components (IC1–IC3). Interestingly, it indicates linear trajectories for each of the cultivars (MP versus SG separated along component IC1) progressing with time (T1 to T3), mostly along IC2 and showing an extra increment under WS (Figure 1C). The so-called “Sample SOM” (Figure 1D) projects these relations into two dimensions. It also shows the two parallel temporal trajectories slightly converging at T3, suggesting an offset between the WS transcriptomic mechanisms of both cultivars and similar stress response mechanisms over time acting in MP and SG.
In summary, SOM portrayal visualizes the expression data of grapevine genes as sample-specific, “individual” images, which enables their visual inspection and comparison. This analysis reveals two different transcriptome clusters for the selected isohydric and anisohydric cultivars, giving rise to two virtually parallel trajectories in sample space, which are indicative of a basic difference of their transcriptomes but similar time courses of their transcriptomes under WS conditions.

2.2. Different Water Management Strategies Regulate Similar Genes under Lasting WS

To better understand the changing gene expression patterns behind the observed trajectories, we analyzed the SOM portraits in more detail. The SOM algorithm clusters genes with correlated expression profiles across the time courses together into red “spot-like” modules in the portraits, which were summarized into one overview “Overexpression map” (Figure 2A, part above; for a detailed description of the SOM portrayal method see the Materials and Methods section and references cited therein). Overall, we identified six such modules labeled with capital letters A–F. They collect the most variant genes, and contain around 300 to 600 genes each (Figure 2A,B; lists of genes in the spots are given in Table A1). The expression profiles of the spots divide into characteristic time courses of both cultivars, namely: genes upregulated permanently in SG and downregulated in MP (spot A); the antagonistic profile (spot B); genes activated in both cultivars at T1 (spot C), T2 (spot D), or T3, however differently expressed between SG and MP (spot E); and, finally, genes upregulated at T3 in both cultivars (spot F, see Figure 2B).
Gene set overrepresentation analysis of the gene lists of each of the spots provides a first glimpse at their functional background (Figure 2B). For example, the genes in spot A, differentially upregulated in SG compared with MP, are related to steroid and lipid biosynthesis, while genes in spot B, differentially upregulated in MP compared with SG, are related to stilbenoid, diarylheptanoid, and gingerol biosynthesis. These different functions of the transcriptional programs thus indicate the basic differences between both cultivars at the gene expression level. Temporal progression is driven in both cultivars by the activation of genes related to cell wall pathogen-defensive functions (T1, spot C); different transcription factors such as MYB, WRKY, and AS2 (T2, spot D); sugar biosynthesis (T3, spot E); and chaperones under long-lasting WS (T3, spot F). These factors act as master regulators, turning on genes involved in various drought tolerance mechanisms [21]. MYB transcription factors are known to regulate genes for osmoprotectant synthesis, secondary metabolite production, and WS responses [22,23,24,25,26,27]. WRKY factors are involved in signaling pathways, hormonal routes, defense responses, antioxidant production, and regulation of other stress-responsive genes [28]. AS2 (ASYMMETRIC LEAVES2) plays a co-opted role in stomatal regulation and water use efficiency, with a key role in flat symmetric leaf formation [29].
To better identify subtle changes in expression patterns in the SOM portraits, we generated mean waterline portraits averaged over all time points referring to CTRL and STRS conditions of MP and SG, respectively (Figure 2C, part above). They highlight regions of up- and downregulated genes in red and blue, respectively, and thus enable us to visualize subtle modulations of gene expression levels more clearly than the standard portraits shown in Figure 1. Two different trajectories for SG and MP in gene space under WS can be identified, pointing in clock- and counterclockwise directions, respectively, and both converging in the right upper corner around spot F (see arrows).
The spots identified in Figure 2A are activated in various combinations, depending on the experimental conditions. This results in diverse configurations of the gene expression landscapes, as depicted by the networks of spot activation (Figure 2C, second row from the top, co-expressed spots are linked by lines). Note that the activation pattern follows the arrows in the waterline portraits. For SG, the spot modules progressively activate along the left and upper edges of the map. For MP, the spot modules activate along the lower and right edges. The activation patterns of SG and MP converge in spot F under lasting WS at T3. The number of jointly activated spots is slightly larger in SG compared to MP and increases under stress, thus reflecting a more complex transcriptional pattern (Figure 2C, the two rows from the bottom). This increased number of jointly activated spots reflects a higher complexity of the underlying transcriptional programs, which slightly increases under lasting WS.
Hence, SOM portrayal complements the two different trajectories for the isohydric and anisohydric cultivars observed in the sample space (see previous subsection) by trajectories in the gene expression space, which enables identification of jointly and differently activated transcriptional programs as a function of the cultivars, the WS conditions, and the time points.

2.3. Topology of Transcriptional Programs under Progressing WS

As shown in the previous section, our spot activation analysis revealed two different trajectories in the gene expression landscape pointing from T1 to T3 in the clockwise and counterclockwise direction for the SG and MP cultivars, respectively (Figure 3A). We asked about the transcriptional programs associated with the different sets of genes taken from the spots to better understand the functional background of the observed WS dynamics. Spot A and B include genes antagonistically activated in SG and MP, respectively, forming a sort of background expression for the anisohydric and isohydric cultivars, respectively. The progression from T1 to T3 along IC2 in ICA analysis (see Figure 1C above) is driven by the sequential activation of spots C, D, and F, respectively (see the scheme in Figure 3B). Hence, the topology of gene activations as visualized by the SG- and MP-trajectories in the three-dimensional gene expression landscape (Figure 3A) and, alternatively, by the spot activation workflow in Figure 3B rationalizes the common and different properties of the isohydric and anisohydric cultivar dynamics under WS.
Figure 3C provides a functional map associating the genes in the spots with the underlying biological functions using gene set enrichment analysis. The anisohydric SG, exhibiting open stomata and being more prone to water deficiency stress, remains consistently predisposed to WS. The genes specifically activated in SG accumulate in spot A (Figure 3C). They associate with functions such as steroid and lipid biosynthesis. We found an enrichment of ketoreductase activity (GO:0045703). Hence, the upregulation of ketoreductases observed in SG background (spot A) can serve as an initial indication of stress accompanied by the plant response to reactive oxygen species [30,31].
In contrast to SG, the isohydric cultivar MP is better adapted to sustain water levels during drought, which is demonstrated by the upregulation of genes associated with plant normal growth, development, transportation, and signaling pathways (see spots B and E in Figure 3C). For instance, some of these genes are linked to stilbenoid, diarylheptanoid, and gingerol biosynthesis. Additionally, there is also GO enrichment in phloem development (GO:0010088), promoting the development of phloem cells, and terpene synthase activity (GO:0010333) that plays a role in plant defense response to environment and pathogens [32].
At the first time point T1, genes in spot C (Figure 3C) upregulate in both MP and SG cultivars. They are enriched by gene sets involved in chitin catabolism (GO:0006032) and cell wall development. A strengthened cell wall (chitin and lignin) is a common defense strategy against drought [33,34], as well as pathogens [35]. The second time point, T2, upregulated genes in spot D (Figure 3C), which is occupied by genes coding transcription factors (MYB, AS2, WRKY). The transcriptional reprogramming mediated by MYB, AS2, and WRKY transcription factors orchestrates broader regulatory networks involved in stress signaling, defense responses, and developmental adjustments reacting to prolonged water shortage. The MYB transcription factors, for example, regulate the secondary metabolism, hormone signaling, and stress responses, contributing to drought tolerance mechanisms [27,36,37]. AS2 transcription factors participate in leaf morphology and physiology which optimizes the efficiency of water management under drought conditions [29,38]. WRKY transcription factors, the integral components of many vines’ stress signaling pathways, coordinate biological processes associated with stress tolerance, such as scavenging of ROS, osmotic regulation, and ABA signaling [39]. There is also an enrichment in GO molecular activity of arogenate dehydrogenase NADP+ (GO:0033730) in spot D. Arogenate is a precursor of phenylalanine that plays a significant role in plant abiotic stress responses [40,41,42]. Hence, with the increasing time under drought, more comprehensive genes are involved in the WS response.
Spot E is upregulated at T3 in SG (under STRS) and MP (under CTRL), thus inducing a certain asymmetry between both trajectories. The gene list of this spot is enriched by sugar biosynthesis genes. For anisohydric cultivars such as SG, sugar serves as an osmoprotectant that maintains cellular hydration under lasting WS [43]. Additionally, this spot is enriched by genes related to lignin catabolism (GO:0046274), playing a role in water management, manganese ion binding (GO:0030145), and trihydroxystilbene synthesis (GO:0050350), considered to be important for pathogen defense [44,45,46]. Hence, osmoprotection and pathogen response become activated in the anisohydric cultivar under lasting WS, while the isohydric cultivar activates these functions under water excess.
STRS-specific spot F (Figure 3C) contains genes enriched by heat-shock/protein-complex oligomerization proteins (GO:0051259) from the family HSP20 acting as molecular chaperones. Such chaperones help plants fight against WS by facilitating protein folding, assembly, stabilization, and degradation [47]. Despite the differences in transcriptomes between SG and MP in T1/T2, water deficiency induces a similar response in prolonged exposure (T3).
Taken together, different “ground state” functions related to lipid and steroid biosynthesis in SG and plant growth functions in isohydric MP give rise to their specific trajectories, which both progress under WS sequentially by activation of transcription factors such as MYB, AS2, and WRKY, ABA-signaling, and arogenate-mediated stress response, and after lasting WS finally express HSP coding genes. An asymmetry in WS dynamics between SG and MP is related to osmoprotection by sugar biosynthesis and lignin catabolism in SG STRS and in MP under CTRL conditions, respectively.

2.4. Isohydric Strategy Is Characterized by Biosynthesis of Stilbenoid and Its Derivatives

Our analysis of gene expression patterns revealed that the isohydric grape cultivar, known for its water-conserving strategies, appears to activate stilbenoid biosynthesis as a marker of drought tolerance, partly in its ground state. Genes related to stilbenoid biosynthesis distribute in a characteristic fashion in the expression landscape with a certain asymmetry towards the MP trajectory (Figure 4A). Although located mostly outside the spots due to the smaller variance in their expression, they can be assigned to different conditions, as discussed in the previous subsection. The heatmap in Figure 4B explicitly provides their expression profiles, revealing their time-dependent activation under the different conditions, which shows their biased upregulation in the isohydric MP cultivar.
For a closer look, we mapped these activation patterns on the stilbenoid KEGG pathway topology, where the gene boxes are colored according to the condition-dependent activation (Figure 4C). CINNAMATE 4-HYDROXYLASE (C4H), encoded by the gene Vitvi06g00803, is an important precursor enzyme for stilbenoid biosynthesis. The gene was found to be upregulated in both SG and MP under optimal CTRL water supply conditions, as indicated by the blue and dark yellow colors, respectively. C4H catalyzes the hydroxylation of trans-cinnamic acid to produce p-coumaric acid, an important intermediate in the biosynthesis of various compounds, including stilbenoids [48]. Next, there is an enzyme HYDROXYCINNAMOYL-CoA:SHIKIMATE/QUINATE TRANSFERASE (HCT–HST/HQT), whose instability allows for various reactions to occur [49,50]. This enzyme is encoded by the genes Vitvi11g00742 and Vitvi08g00940, which exhibited interesting expression dynamics. Vitvi11g00742 showed higher expression in MP CTRL during the initial reaction, whereas it was upregulated in SG STRS. This enzyme mediates the formation of p-Coumaroyl shikimic acid and p-Coumaroyl quinic acid [50,51]. Subsequent reactions showed differential expression patterns, with Vitvi11g00742 shifting its overexpression entirely to MP STRS. The enzyme CAFFEOYL-COA O-METHYLTRANSFERASE (CCoAOMT), encoded by gene Vitvi03g00524, emerged as a dominant player in (isohydric) MP STRS as well. It is known to respond to water deficiency stress [52]. Other downstream enzymes involved in the synthesis of stilbenoids, namely RESVERATROL SYNTHASE (RS) and RESVERATROL O-METHYLTRANSFERASE (ROMT), were found to be exclusively overexpressed in MP STRS conditions. The RS enzyme, encoded by Vitvi16g01472, catalyzes the condensation of malonyl-CoA with p-Coumaroyl-CoA to form resveratrol [53], while the enzyme ROMT (encoded by Vitvi12g02241) methylates the resveratrol to produce a pterostilbene [54]. All these genes exhibited higher expression levels in MP under both control and stress conditions, suggesting a potential role for resveratrol and pterostilbene in response to water deficiency stress in MP in agreement with the topology of WS transcriptome dynamics (see Figure 3C).
In summary, the detailed mapping of gene expression patterns onto the stilbenoid pathway elucidated the overall asymmetric role of various members of this pathway in MP’s and SG’s distinct responses to WS, where, notably, resveratrol biosynthetic genes were uniquely upregulated in the isohydric MP.

2.5. Biosynthesis of Thiamine Is Promoted under WS Conditions

Next, we aimed to elucidate the thiamine biosynthesis pathway in grapevines (Figure 5). This pathway was shown to react under conditions of low-temperature stress in Vitis vinifera [18] and was assumed to play an important role also under WS conditions [55]. The “gene map” of the thiamine biosynthesis pathway genes, as well as their expression heatmap, reveal the gene activation across the whole SOM landscape except the T1-specific area (Figure 5A,B). As for the pathway of biosynthesis of stilbenoid and its derivatives, we transferred the gene expression profiles into the KEGG pathway topology (Figure 5C). Under control conditions, both MP and SG cultivars exhibited nearly stable expression of genes involved in thiamine biosynthesis. These genes encode enzyme isoforms, including THIAZOLE (TH1), PYRIMIDINE SYNTHETASE (THIC), and THIAMINE PYROPHOSPHOKINASE (TPK/THIN), which plays a role in synthesizing the active form of thiamine. In plants, three forms of thiamine are physiologically active: free thiamine, thiamine monophosphate, and thiamine pyrophosphate. The Enzyme Commission number is depicted by the colored (blue, yellow) rectangles in the pathway diagram (see Figure 5C). Notably, the expression of these genes in both cultivars is similar also under WS, indicating a basal level of thiamine biosynthesis activity in grapevine plants.
Under WS, both cultivars exhibited the upregulation of structural genes, encoding isoforms of the enzyme 1-DEOXY-D-XYLULOSE-5-PHOSPHATE SYNTHASE (DXS). DXS is associated with the precursor production for both thiamine and isoprenoid biosynthesis [56], particularly DXP production from glycolysis. Isoprenoids, which have a positive correlation with the level of DXP transcript [57], play crucial roles in plant stress tolerance mechanisms [58]. Other studies have shown that the overexpression of DXS leads to increased chlorophyll and carotenoid content [59]. Furthermore, under the stress conditions, a cluster of genes was upregulated at the final stage of the pathway. Products of these genes convert the active form of thiamine, thiamine diphosphate (TPP), either to thiamine triphosphate (Vitvi01g001564, Vitvi17g00142, Vitvi11g00609, Vitvi17g00137, Vitvi14g01574, Vitvi13g00202) or thiamine monophosphate (Vitvi04g01575).
The grapevine gene Vitvi11g01303, encoding a probable enzyme 1-DEOXY-D-XYLULOSE-5-PHOSPHATE SYNTHASE2 (DXS2), exhibits upregulation in SG STRS compared to SG CTRL and even higher overexpression in MP STRS (Figure 5B). The presence of multiple DXS isoforms with distinct expression patterns in both cultivars suggests a potentially intricate regulatory mechanism governing DXP production in response to WS. The third precursor gene in thiamine biosynthesis, Vitvi07g01408, producing an enzyme L-CYSTEINE DESULFURASE 1 (LCD), provides the essential sulfur atom for thiazole precursor synthesis [60]. It was notably overexpressed under the WS compared to control conditions.
In summary, our analysis shows the various activations of thiamine biosynthesis genes under WS, from the initiation of precursor production to the final conversion of thiamine di-/tri- phosphate. This comprehensive understanding offers valuable insights into the distinct responses of MP and SG cultivars, potentially influencing their resilience to prolonged water deficit.

2.6. Exploring Differentially Expressed Genes Taken from the Original Study

Mapping of specifically modulated genes from the previous study [15] into our SOM landscape supports our results regarding a set of about 6000 highly differentially expressed genes (Figure A1). SOM portrayal, however, disentangles and visualizes in detail their covariance structure not evident from the original list. Notably, SOM portrayal distributes these genes across a transcriptome landscape, obeying the topology of transcriptomic co-regulation networks. Specifically, modulated genes in SG and MP fit into the WS trajectories extracted from the SOM analysis and visualized by the upregulated regions of the waterline portraits, as expected (Figure A2). However, SOM analysis more clearly disentangles the modulated genes into distinct modules of coregulation with distinct functional impact and, moreover, extracts higher genes of stronger variance compared with the significance analysis of microarrays (SAM) and ANOVA algorithms applied in the original paper [15] and the references cited therein. SAM should be used with caution because of the limitations of the method, particularly in overrating threshold settings and variance corrections [61].
Up- and downregulated genes, due to the WS, extract additional modules of co-regulated genes with different functional impacts, such as photosynthesis and DNA repair (Figure A3). Finally, we also considered genes differentially expressed under a “recovery from the WS” (i.e., re-watering 70 days after the onset of the WS), which indicates the partial reversal of the gene expression changes caused by prolonged WS (Figure A4).
Our SOM analysis demonstrates highly similar differential gene expression patterns for the genes previously reported. SOM considers genes of higher variance, which extends the range of the functional impact of WS dynamics. Note also that our SOM landscape reflects expression patterns without pre-selecting case vs. control conditions (e.g., STRS vs. CTRL, SG vs. MP), which were addressed in downstream analyses as applied above. It thus provides a sort of holistic modular transcriptomic map that considers the cultivar, conditions, and time points independently, which is required for estimating the trajectories of WS in the SOM landscape and not explicitly available using the SAM and ANOVA approaches.

3. Discussion

In this study, we reanalyzed whole-genome transcriptional microarray data of Vitis vinifera leaves [15] by applying the SOM clustering algorithm [62,63], which has previously been successfully employed in analyzing gene expression data on grapevine cultivars under low-temperature stress conditions [18]. We are motivated for this study by a series of key advantages of SOM machine learning, such as high-resolution clustering into function-relevant modules of co-regulated genes, intuitive visualization of whole transcriptome landscapes with single-sample resolution (SOM portrayal), the combination of dimension and redundancy reduction with whole data processing, statistical power of feature selection and tracking expression trajectories in a topology-aware transcriptome landscape, which, overall, enabled the detailed analysis of gene expression changes over the stress period (2, 6, and 27 days), to compare both isohydric and anisohydric strategies of two selected cultivars against WS. For a detailed description of the method and its strength in different applications, we refer to our previous work [20,64,65,66]. Here we continue our studies on aspects of genomic regulation of grapevine physiology suffering from abiotic stress after considering cold temperature stress [18].
The isohydric and anisohydric cultivars show distinct physiological and morphological changes under WS [5,6,15,67,68,69]. To understand the underlying gene regulation of drought-responsive processes at the transcriptome and pathway levels in two grapevine genotypes differing in water management strategy, we performed SOM portrayal and WS trajectory analysis in sample and gene space in combination with detailed knowledge mining of the patterns of the identified coregulated genes. The divergence of transcriptional programs between SG and MP in response to WS exemplifies the two different stress-response strategies of these grapevine cultivars.
In accordance with the previous findings in the original reference publication [15], our research identified the activation of genes coding for chaperones and heat-shock proteins in response to prolonged WS. Chaperones and heat-shock proteins are crucial components of the cell’s machinery for protein folding. They assist in the proper folding of proteins and prevent the aggregation of misfolded proteins, which can be detrimental to cellular function and survival. Under normal conditions, proteins fold into their functional, three-dimensional structures with the help of chaperones. However, under stress conditions like drought, the normal protein folding process can be disrupted, leading to the accumulation of misfolded or unfolded proteins. Hence, the activation of genes coding for chaperones and heat-shock proteins is a critical component of the plant’s response to long-lasting WS.
Our trajectory analysis based on module activation adds a novel, more comprehensive view of WS dynamics in the anisohydric and isohydric cultivars not addressed by Dal Santo and colleagues [15]. SOM portrayal reveals that during the initial stages of water deprivation, both vine cultivars adjust the cell wall composition and structure that might be necessary to cope with reduced water availability. This suggests that it starts with physical reinforcement of the cell wall, followed by broader stress signaling and adjustment, and finally, adaptation for long-term survival through compatible solutes and protein stability. This could help the grapevine to maintain cell integrity under the pressure of water deficit, reduce water loss by creating a tighter barrier, and enhance resistance to potential secondary stresses like pathogens that might exploit drought-weakened plants. The activation of specific transcription factors like MYB, WRKY, and AS2 signifies a shift towards a broader stress response. We speculate that the WS-driven upregulation of steroid and lipid biosynthesis, specifically in anisohydric SG, strengthens cell membranes, while ketoreductases help detoxify harmful substances. This response also involves the production of phytohormones, like ABA and antioxidants, to protect cells from damage.
On the other hand, the isohydric MP prevails in water conservation and stomatal regulation, which diminishes water loss under WS. The stilbenoids, diarylheptanoids, and gingerols possess antioxidant properties so they could mitigate oxidative stress induced by drought. The isohydric vine may allocate resources towards a synthesis of such compounds to bolster the defense mechanisms against drought-induced oxidative stress and enhance tolerance to water deficit.
Moreover, our analysis indicates fast activation of stilbenoid biosynthesis genes (C4H, RS, ROMT, promiscuous HCT, and CCoAOMT) in the isohydric grape cultivar under WS. Particularly, the increased expression of resveratrol biosynthesis genes in MP (compared to SG) implies that wines derived from this cultivar may accumulate higher resveratrol content than those from the SG cultivar under WS conditions.
In our previous work, we identified the upregulation of thiamine biosynthetic genes in low- and extremely low-temperature stress [18], which motivated us to analyze this pathway under WS. Notably, recent studies have highlighted the significance of thiamine in the plant response to WS [70,71], demonstrating significant upregulation of THI1 and THIC genes under drought and dry air humidity stresses [72,73]. Our findings support the hypothesis that the production of thiamine is not only a cold acclimation stress-responsive but also a WS-responsive compound in both iso- and aniso-hydric vine cultivars. Here, we provided more elaborate insights into the cascade of gene activation underlying stress response mechanisms in grapevine.
The focus on stilbenoid and thiamine pathways is, although justified by the data and motivated by our previous work, somewhat arbitrary, but it illustrates the potency of the transcriptomic data for extracting WS responses at the pathway level. Although their phenotypes assign them isohydric and anisohydric characteristics, differential gene expression between them does not necessarily directly relate to molecular causes of the different water management strategies. Future investigations should generalize the results by extending the number of vine accessions in similar experimental and analysis settings.
In conclusion, the dynamics of biological processes in both studied cultivars under WS and control conditions might shed light on further vine research. Experimental studies are needed to fully understand these mechanisms and their potential applications in improving drought resistance, which has significant implications for vine production, particularly in regions where water availability is a major constraint. In the future, this research might help to explore the possibility of manipulating biochemical pathways to enhance drought tolerance in other vine cultivars, securing viticulture in the face of changing climate. Overall, our findings underscore the genomic diversity and different adaptability of these cultivars to changing environments.

4. Materials and Methods

4.1. Expression Data and Treatment Conditions

The gene expression data were downloaded from the supporting dataset (GEO: GSE70670; http://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?token=ovqbgaqedfaxjqn&acc=GSE70670; accessed on 3 February 2024) provided by Dal Santo and colleagues [15]. It encompasses normalized gene expression data (Nimblescan v2.5 software-calculated Robust Multiarray Average/RMA-normalized signal intensities) from leaves (L) of two grapevine (Vitis vinifera L.) cultivars, ‘Montepulciano’—clone R7 (here referred to as MP) and ‘Sangiovese’—clone VCR30 (here referred to as SG), possessing isohydric and anisohydric characteristics, respectively. For a detailed description of the experimental set-up, we refer to the original publication [15]. In short, both cultivars were grafted onto 1103 Paulsen rootstock, and 8-year-old, well-maintained, greenhouse-potted vines were used in the experiment. Two groups were established for each cultivar: a water-stressed group (STRS) that received 40% of maximum water availability relative to the soil field capacity of 30.2% [(vol water/vol soil) × 100], and a well-watered control group (CTRL) that received 90% of maximum water availability. The samples were collected for the analysis of transcriptome at three time points following the initiation of WS: 2, 6, and 27 days (referred to as T1, T2, and T3, respectively). These time points represent different stages of drought stress, ranging from the initial onset of WS to prolonged exposure to the stress. The experiment included three biological replicates (r1, r2, and r3) for each condition in both cultivars. Dal Santo and colleagues complemented transcriptomic measurement with phenotypic data, particularly leaf physiological and leaf biochemical parameters. We refer to the original publication for details [15].

4.2. Self-Organizing Map

The SOM portrayal algorithm was employed to analyze the preprocessed gene expression data using the oposSOM software (version 2.2.5), as described previously [18]. A total of 36 samples were used as input, containing expression values for 28,521 genes. These represent 81.18% of the 35,134 annotated coding genes of Vitis vinifera that were found in the Ensembl database [74,75] on the 16th of May, 2023. The SOM was configured to have 1600 neurons (also called metagenes, characterizing the mean transcriptional profile of the genes collected in the respective neuron), arranged in a quadratic lattice with dimensions 40 × 40. During training, the SOM distributed the gene expression values across the neurons/metagenes, effectively reducing the high-dimensional data into a 2-dimensional representation. The gene expression profiles of each treatment condition, including control and stressed samples for both cultivars, were mapped onto the SOM grid. The resulting SOM, obtained for each treatment condition, was visualized as an expression “portrait”. To enable the visual interpretation of these SOM “portraits”, a tertiary color code was used to color each metagene, ranging from red through green to blue, corresponding to high to low gene expression. As the metagenes that are located close to each other include genes with similar expression profiles, we can define red and blue spots in the SOM “portraits”. Red spots signify transcript upregulation, while blue spots indicate transcript downregulation, deviating more than the upper or lower quartile in a positive or negative direction, respectively.
Alternatively, we used “waterline” profiles, indicating expression values above and below the mean in red and blue, respectively, to better visualize slight changes in the transcriptome patterns. Statistics of the spot expression in terms of jointly activated spots in the individual portraits, spot number frequencies, and mean numbers of spots per portrait provide details of the topology of the activated transcriptome under the different treatment conditions. For a comparison of differentially expressed genes published in the previous study [15] with our SOM results, we mapped the selected marker genes into our SOM expression landscape to show their distribution (see Figure A1, Figure A2, Figure A3 and Figure A4). The sample similarity analysis uses a pairwise correlation map, independent component analysis, and sample SOM presentations. Details of the methods used and their applications to different use cases were described previously [20,64,65,66] and are available in the R-package oposSOM [62].

4.3. Functional Annotation

KEGG [76] and VitisNet [77] databases were used to functionally annotate genes for the gene set analysis, and PANTHER (version 18.0; [78]) was employed with default settings for the gene ontology (GO) enrichment analysis (for details see [18]). Genes from the KEGG pathways mentioned in this work were mapped onto SOM overexpression spots.

Author Contributions

Conceptualization, A.A., H.B. and T.K.; methodology, A.A., T.K., H.B. and M.N.; validation, A.A., T.K., H.B. and M.N.; formal analysis, T.K., H.B. and A.A.; investigation, A.A., T.K. and H.B.; resources, A.A. and T.K.; data curation, A.A. and T.K.; writing—original draft preparation, A.A., T.K. and H.B.; writing—review and editing, A.A., T.K. and H.B.; visualization, T.K.; supervision, H.B.; project administration, H.B.; funding acquisition, H.B. All authors have read and agreed to the published version of the manuscript.

Funding

This work was supported by the Foundation of Armenian Science and Technology (FAST) within the framework of the ADVANCE Research Grants Program project Vine Bioinformatics—grape genomics for innovative viticulture, funded by Joe Barnes. We acknowledge financial support from the German Research Foundation (DFG) and Universität Leipzig within the program of Open Access Publishing.

Data Availability Statement

Expression data were taken from a previous study [15]. The R-object of our SOM analysis is deposited online in the Leipzig Health Atlas with the accession number 611 (LHA:611; https://www.health-atlas.de/data_files/611 accessed on 26 July 2024).

Conflicts of Interest

The authors declare no conflicts of interest.

Appendix A

Figure A1. Covariance and population structure of the SOM expression landscape. (A) The 5947 genes significantly modulated in leaves under our experimental conditions were taken from the SAM analysis in [15] and mapped into our SOM. Occupied metagenes (pixels) are marked in greyish. They refer mostly to metagenes of high and moderate variance of gene expression (see part C). (B) The covariance structure of the SOM was estimated by calculating a weighted topological overlap (WTO) network between the spot modules [65]. It reveals strong anticorrelations (w < 0) between the two cultivars (SG vs. MP) and between the two conditions (STRS vs. CTRL; see the scheme on the right). It thus assigns the “modulated genes” (part A) to up- and downregulation under the different conditions. Note also that the SOM decomposes the “modulated genes” into clusters of co-regulated genes called spot modules. (C) The variance map of the metagenes reveals a variance gradient of gene expression from the center of the SOM (blue) towards its edges (brown). The population map color codes the number of genes per metagene from high (red) to low (blue). The gene density changes across the SOM. Also, the Euclidean distances between neighboring metagenes are variant and “amplify” regions of increased gene density. The K-means map provides a space-filling segmentation of the SOM, enabling it to consider any region for downstream analysis, such as function mining.
Figure A1. Covariance and population structure of the SOM expression landscape. (A) The 5947 genes significantly modulated in leaves under our experimental conditions were taken from the SAM analysis in [15] and mapped into our SOM. Occupied metagenes (pixels) are marked in greyish. They refer mostly to metagenes of high and moderate variance of gene expression (see part C). (B) The covariance structure of the SOM was estimated by calculating a weighted topological overlap (WTO) network between the spot modules [65]. It reveals strong anticorrelations (w < 0) between the two cultivars (SG vs. MP) and between the two conditions (STRS vs. CTRL; see the scheme on the right). It thus assigns the “modulated genes” (part A) to up- and downregulation under the different conditions. Note also that the SOM decomposes the “modulated genes” into clusters of co-regulated genes called spot modules. (C) The variance map of the metagenes reveals a variance gradient of gene expression from the center of the SOM (blue) towards its edges (brown). The population map color codes the number of genes per metagene from high (red) to low (blue). The gene density changes across the SOM. Also, the Euclidean distances between neighboring metagenes are variant and “amplify” regions of increased gene density. The K-means map provides a space-filling segmentation of the SOM, enabling it to consider any region for downstream analysis, such as function mining.
Plants 13 02501 g0a1
Figure A2. Genes specifically modulated in the accessions were taken from supporting data [15] and compared to the respective waterline portraits. Genes modulated in SG and MP accumulate in the overexpressed areas in SG and MP, respectively.
Figure A2. Genes specifically modulated in the accessions were taken from supporting data [15] and compared to the respective waterline portraits. Genes modulated in SG and MP accumulate in the overexpressed areas in SG and MP, respectively.
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Figure A3. Genes modulated specifically under stress conditions. The cutoffs defining upregulated (UP in STRS/CTRL) and downregulated (DOWN in STRS/CTRL) genes were taken from [15] (fold change > 2 and top 20% variant genes) and mapped into the SOM. Clusters of genes accumulate in different areas of the SOM in and near the spots. The respective profiles are shown on the right, together with the respective biological functions. As expected, the profiles confirm the UP/DOWN under STRS conditions, showing the respective changes, especially under lasting stress at T3. The profiles also show that the expression changes are about one order of magnitude smaller compared with that observed in the spots. The bars are color-coded as in the other figures.
Figure A3. Genes modulated specifically under stress conditions. The cutoffs defining upregulated (UP in STRS/CTRL) and downregulated (DOWN in STRS/CTRL) genes were taken from [15] (fold change > 2 and top 20% variant genes) and mapped into the SOM. Clusters of genes accumulate in different areas of the SOM in and near the spots. The respective profiles are shown on the right, together with the respective biological functions. As expected, the profiles confirm the UP/DOWN under STRS conditions, showing the respective changes, especially under lasting stress at T3. The profiles also show that the expression changes are about one order of magnitude smaller compared with that observed in the spots. The bars are color-coded as in the other figures.
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Figure A4. Genes specifically modulated under recovery from WS. Recovery conditions were achieved by re-watering the plants 46 days after the onset of WS, and the post-recovery plant material was collected 70 days after the onset of WS (see Materials and Methods in [15]). Upregulated (UP) and downregulated (DOWN) genes and their respective profiles are shown separately. The profiles refer to the stress experiment. Recovery virtually reverses expression changes observed for lasting stress (STRS at T3).
Figure A4. Genes specifically modulated under recovery from WS. Recovery conditions were achieved by re-watering the plants 46 days after the onset of WS, and the post-recovery plant material was collected 70 days after the onset of WS (see Materials and Methods in [15]). Upregulated (UP) and downregulated (DOWN) genes and their respective profiles are shown separately. The profiles refer to the stress experiment. Recovery virtually reverses expression changes observed for lasting stress (STRS at T3).
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Table A1. Lists of genes in the SOM spots A–F. Number of genes per each spot is in parentheses.
Table A1. Lists of genes in the SOM spots A–F. Number of genes per each spot is in parentheses.
A (376 Genes)B (309 Genes)C (340 Genes)D (384 Genes)E (462 Genes)F (695 Genes)
Vitvi17g00237Vitvi10g02124Vitvi15g01586Vitvi04g02074Vitvi14g02553Vitvi13g00164
Vitvi16g01025Vitvi08g01847Vitvi18g00424Vitvi04g00410Vitvi09g01725Vitvi06g01513
Vitvi01g00437Vitvi10g02194Vitvi10g00667Vitvi18g02126Vitvi13g02480Vitvi13g00169
Vitvi01g00580Vitvi18g02451Vitvi15g01587Vitvi18g00833Vitvi19g02069Vitvi12g00573
Vitvi01g01028Vitvi05g01951Vitvi10g01684Vitvi01g01736Vitvi17g01664Vitvi07g02152
Vitvi19g00388Vitvi10g02121Vitvi04g00501Vitvi19g00456Vitvi07g02304Vitvi14g01193
Vitvi18g02718Vitvi07g00973Vitvi05g01760Vitvi04g02122Vitvi10g00867Vitvi19g00618
Vitvi14g01657Vitvi17g01737Vitvi13g01250Vitvi19g01484Vitvi09g01261Vitvi13g00166
Vitvi14g02664Vitvi17g01732Vitvi11g00016Vitvi02g01517Vitvi04g02117Vitvi13g00471
Vitvi15g01691Vitvi10g02195Vitvi01g01917Vitvi18g00596Vitvi17g01693Vitvi13g00162
Vitvi16g01878Vitvi08g01380Vitvi15g00970Vitvi05g01287Vitvi16g01659Vitvi04g01974
Vitvi04g00827Vitvi13g00925Vitvi07g02119Vitvi19g01674Vitvi16g00770Vitvi07g00055
Vitvi07g01789Vitvi17g01736Vitvi06g00268Vitvi10g01493Vitvi04g01870Vitvi05g01933
Vitvi03g01162Vitvi10g02181Vitvi07g02123Vitvi08g01548Vitvi18g02894Vitvi06g00526
Vitvi18g00871Vitvi04g01325Vitvi16g00941Vitvi16g00027Vitvi01g02297Vitvi18g01438
Vitvi17g01541Vitvi10g02190Vitvi18g01937Vitvi07g02288Vitvi07g02725Vitvi09g01282
Vitvi18g02157Vitvi12g00224Vitvi15g00714Vitvi03g01582Vitvi14g02863Vitvi10g00034
Vitvi16g02001Vitvi18g02293Vitvi01g01934Vitvi15g01364Vitvi14g01112Vitvi18g02423
Vitvi02g01350Vitvi11g00460Vitvi02g01404Vitvi13g02086Vitvi18g02584Vitvi10g01778
Vitvi04g01352Vitvi04g02105Vitvi07g01844Vitvi13g02044Vitvi19g01302Vitvi07g00259
Vitvi13g01356Vitvi18g02289Vitvi18g01263Vitvi10g01807Vitvi14g01082Vitvi13g02077
Vitvi05g01256Vitvi06g01097Vitvi18g02446Vitvi10g00859Vitvi14g01106Vitvi08g00731
Vitvi08g01052Vitvi00g00339Vitvi04g00760Vitvi10g02180Vitvi14g01080Vitvi18g01070
Vitvi19g01504Vitvi16g01302Vitvi15g01582Vitvi15g00736Vitvi16g01613Vitvi02g01447
Vitvi12g02444Vitvi18g03097Vitvi02g01403Vitvi14g03039Vitvi17g01674Vitvi07g00455
Vitvi18g03185Vitvi19g00216Vitvi10g00742Vitvi17g00315Vitvi15g01363Vitvi01g02273
Vitvi12g02069Vitvi12g00602Vitvi05g00011Vitvi19g01322Vitvi14g02865Vitvi18g02559
Vitvi19g01984Vitvi04g01233Vitvi18g02287Vitvi14g02789Vitvi19g02154Vitvi10g00403
Vitvi01g00350Vitvi04g01375Vitvi03g01621Vitvi18g01927Vitvi14g02533Vitvi19g02371
Vitvi14g02925Vitvi14g00297Vitvi14g00500Vitvi04g00160Vitvi16g02162Vitvi06g01575
Vitvi19g00107Vitvi13g01320Vitvi06g01604Vitvi08g02076Vitvi08g01978Vitvi02g00020
Vitvi01g01982Vitvi02g00783Vitvi06g01601Vitvi13g00109Vitvi14g01075Vitvi14g03078
Vitvi12g00927Vitvi08g02249Vitvi02g00393Vitvi16g01641Vitvi14g02548Vitvi05g00139
Vitvi18g00717Vitvi12g02165Vitvi14g01381Vitvi18g03208Vitvi14g01096Vitvi19g00381
Vitvi17g00609Vitvi04g01940Vitvi03g00708Vitvi09g01460Vitvi16g00772Vitvi05g00681
Vitvi15g00005Vitvi06g01100Vitvi07g01697Vitvi14g03080Vitvi10g01046Vitvi06g01746
Vitvi00g01279Vitvi05g02283Vitvi05g02248Vitvi08g01941Vitvi06g01301Vitvi12g00301
Vitvi11g00526Vitvi10g02113Vitvi18g02727Vitvi07g02115Vitvi10g01626Vitvi16g00205
Vitvi02g01806Vitvi07g02402Vitvi11g01674Vitvi12g02456Vitvi12g02239Vitvi11g01450
Vitvi03g01891Vitvi09g01214Vitvi18g00979Vitvi01g01387Vitvi10g00869Vitvi09g00246
Vitvi10g02223Vitvi05g00669Vitvi18g02592Vitvi07g02146Vitvi09g00878Vitvi11g01333
Vitvi10g00001Vitvi13g01889Vitvi19g00094Vitvi08g02329Vitvi18g03390Vitvi11g00251
Vitvi12g02448Vitvi18g02463Vitvi12g02244Vitvi08g01303Vitvi13g02426Vitvi10g00459
Vitvi08g01404Vitvi15g01669Vitvi11g01491Vitvi19g02218Vitvi13g01559Vitvi14g01951
Vitvi08g01617Vitvi02g01037Vitvi05g01577Vitvi04g02233Vitvi18g03068Vitvi05g00461
Vitvi14g01127Vitvi13g01404Vitvi14g01868Vitvi14g02756Vitvi18g02935Vitvi16g01985
Vitvi13g01180Vitvi15g01663Vitvi07g02735Vitvi18g01565Vitvi16g01469Vitvi12g02469
Vitvi11g01251Vitvi01g00555Vitvi09g01536Vitvi04g00988Vitvi00g02157Vitvi03g00119
Vitvi14g02469Vitvi16g02010Vitvi14g01488Vitvi12g01676Vitvi18g02870Vitvi04g02187
Vitvi05g02198Vitvi10g02119Vitvi15g00844Vitvi17g00662Vitvi14g02864Vitvi19g02000
Vitvi17g00788Vitvi18g02631Vitvi02g00391Vitvi08g00199Vitvi18g03332Vitvi00g02173
Vitvi14g02722Vitvi10g02301Vitvi06g01515Vitvi08g02328Vitvi01g01614Vitvi12g00028
Vitvi03g01584Vitvi05g01940Vitvi07g00665Vitvi13g02029Vitvi09g00908Vitvi18g02906
Vitvi01g00605Vitvi14g02575Vitvi14g02913Vitvi18g03011Vitvi14g01113Vitvi08g02117
Vitvi03g01890Vitvi16g01449Vitvi08g02147Vitvi10g01983Vitvi13g00931Vitvi07g00293
Vitvi04g02192Vitvi17g00972Vitvi01g01921Vitvi02g01439Vitvi16g01474Vitvi19g01760
Vitvi17g00639Vitvi18g02464Vitvi09g00264Vitvi05g00716Vitvi04g02121Vitvi08g02393
Vitvi03g01603Vitvi08g01848Vitvi12g02565Vitvi09g00524Vitvi17g00592Vitvi02g00543
Vitvi18g02061Vitvi10g01613Vitvi12g02718Vitvi08g02343Vitvi13g02424Vitvi05g01837
Vitvi18g02716Vitvi18g02273Vitvi07g02114Vitvi19g02019Vitvi08g00035Vitvi04g01794
Vitvi17g00405Vitvi10g02174Vitvi18g03084Vitvi14g02445Vitvi18g01019Vitvi04g01920
Vitvi14g01222Vitvi02g01850Vitvi02g01440Vitvi18g02586Vitvi16g01481Vitvi19g02268
Vitvi05g01439Vitvi12g02275Vitvi08g00768Vitvi18g00164Vitvi18g02881Vitvi02g00264
Vitvi00g02337Vitvi12g02241Vitvi11g00726Vitvi14g00940Vitvi12g02350Vitvi14g01726
Vitvi01g00065Vitvi18g03265Vitvi01g00710Vitvi14g02691Vitvi09g02069Vitvi07g02229
Vitvi03g01887Vitvi12g02245Vitvi07g02604Vitvi12g02386Vitvi16g01457Vitvi19g01791
Vitvi08g00942Vitvi07g02390Vitvi07g02650Vitvi09g00304Vitvi00g02261Vitvi14g01942
Vitvi13g02451Vitvi12g02243Vitvi08g01291Vitvi04g00013Vitvi12g02338Vitvi02g00162
Vitvi12g01836Vitvi12g02274Vitvi11g00467Vitvi09g01984Vitvi12g02340Vitvi08g01656
Vitvi18g02722Vitvi18g03098Vitvi14g01815Vitvi18g02521Vitvi16g01702Vitvi13g01839
Vitvi12g00596Vitvi11g01701Vitvi14g00461Vitvi07g01519Vitvi16g00133Vitvi05g01839
Vitvi01g00697Vitvi01g00532Vitvi06g00931Vitvi19g00604Vitvi15g01406Vitvi07g00117
Vitvi07g01990Vitvi11g01037Vitvi05g00710Vitvi07g02322Vitvi12g01852Vitvi01g00329
Vitvi04g02196Vitvi02g01649Vitvi19g00321Vitvi12g02387Vitvi09g00920Vitvi08g02274
Vitvi14g01149Vitvi13g00701Vitvi14g02930Vitvi15g01372Vitvi11g00126Vitvi16g01022
Vitvi12g02742Vitvi08g01650Vitvi18g00675Vitvi04g02129Vitvi13g01566Vitvi13g02070
Vitvi19g00656Vitvi07g01308Vitvi09g00233Vitvi10g02222Vitvi19g02190Vitvi07g01296
Vitvi12g00036Vitvi12g02292Vitvi14g00483Vitvi07g02949Vitvi18g02746Vitvi14g01354
Vitvi03g00406Vitvi05g01934Vitvi01g00784Vitvi06g00040Vitvi09g00907Vitvi06g01360
Vitvi12g00478Vitvi12g00243Vitvi15g00314Vitvi04g00467Vitvi16g00761Vitvi07g00380
Vitvi12g01984Vitvi12g02285Vitvi16g01213Vitvi17g00895Vitvi06g01812Vitvi05g00857
Vitvi12g02569Vitvi19g02111Vitvi04g00442Vitvi03g01521Vitvi07g02369Vitvi13g02192
Vitvi14g01952Vitvi09g01872Vitvi13g00509Vitvi13g00546Vitvi09g01782Vitvi09g01904
Vitvi16g01697Vitvi10g01656Vitvi14g01977Vitvi14g02916Vitvi16g00251Vitvi08g02143
Vitvi09g01145Vitvi01g00574Vitvi06g01597Vitvi13g01737Vitvi13g01564Vitvi10g00330
Vitvi06g00714Vitvi17g01739Vitvi02g01661Vitvi16g01122Vitvi14g02773Vitvi18g01510
Vitvi07g00130Vitvi03g01777Vitvi06g00790Vitvi07g03080Vitvi16g01464Vitvi00g02264
Vitvi08g01333Vitvi07g02231Vitvi18g00967Vitvi09g00700Vitvi16g00991Vitvi08g01543
Vitvi05g01151Vitvi06g01577Vitvi04g02241Vitvi06g00894Vitvi18g03026Vitvi16g01144
Vitvi17g00175Vitvi18g02508Vitvi18g00956Vitvi14g02449Vitvi09g01663Vitvi19g02274
Vitvi15g01651Vitvi18g00290Vitvi18g00476Vitvi14g00958Vitvi03g01749Vitvi13g00490
Vitvi19g02029Vitvi04g01241Vitvi08g01335Vitvi01g02264Vitvi17g01665Vitvi13g00688
Vitvi14g02515Vitvi03g01885Vitvi13g00114Vitvi14g01939Vitvi14g02570Vitvi05g00118
Vitvi12g02454Vitvi09g01187Vitvi10g01615Vitvi09g00560Vitvi02g01072Vitvi08g02015
Vitvi16g02146Vitvi12g02289Vitvi11g01488Vitvi10g01009Vitvi19g01220Vitvi17g00554
Vitvi07g00021Vitvi07g01814Vitvi16g01931Vitvi15g01257Vitvi12g02345Vitvi08g00656
Vitvi02g00171Vitvi16g02005Vitvi08g00630Vitvi07g00781Vitvi14g00218Vitvi10g00558
Vitvi18g01884Vitvi03g01896Vitvi02g01459Vitvi13g00556Vitvi05g01039Vitvi05g01392
Vitvi10g01650Vitvi15g01762Vitvi16g01932Vitvi18g02673Vitvi18g02889Vitvi04g01793
Vitvi17g01414Vitvi12g02269Vitvi08g01702Vitvi09g00708Vitvi07g02079Vitvi07g00256
Vitvi04g01815Vitvi12g01121Vitvi19g00404Vitvi08g01625Vitvi05g02015Vitvi06g00999
Vitvi14g03033Vitvi17g01302Vitvi19g00690Vitvi14g02736Vitvi14g02550Vitvi09g00996
Vitvi14g01211Vitvi08g01382Vitvi18g01938Vitvi03g01556Vitvi07g02387Vitvi05g00204
Vitvi07g00586Vitvi08g02247Vitvi04g01481Vitvi04g02014Vitvi19g01921Vitvi09g00275
Vitvi04g00282Vitvi05g02086Vitvi18g01001Vitvi07g01653Vitvi16g01473Vitvi07g03183
Vitvi18g01895Vitvi10g02106Vitvi14g01739Vitvi01g00291Vitvi16g01570Vitvi12g00444
Vitvi01g00319Vitvi00g01453Vitvi11g00641Vitvi10g01994Vitvi14g02828Vitvi05g01840
Vitvi18g02320Vitvi04g01890Vitvi03g01276Vitvi07g00843Vitvi19g00423Vitvi14g01943
Vitvi00g00342Vitvi12g00610Vitvi08g01701Vitvi18g02791Vitvi12g02277Vitvi08g01532
Vitvi01g01884Vitvi18g00860Vitvi09g00971Vitvi13g00635Vitvi19g02228Vitvi02g00263
Vitvi17g01393Vitvi14g02609Vitvi05g00094Vitvi07g01638Vitvi18g01447Vitvi05g00430
Vitvi16g01566Vitvi19g00445Vitvi10g01734Vitvi11g00914Vitvi15g01326Vitvi12g00462
Vitvi07g01720Vitvi12g02702Vitvi10g00436Vitvi18g01056Vitvi18g01442Vitvi07g02212
Vitvi16g00908Vitvi01g02003Vitvi19g02050Vitvi18g00241Vitvi12g02617Vitvi14g00971
Vitvi12g02080Vitvi10g02129Vitvi09g01399Vitvi10g00938Vitvi12g02337Vitvi07g00598
Vitvi13g00025Vitvi01g00611Vitvi01g00525Vitvi04g00570Vitvi15g01680Vitvi17g00116
Vitvi17g00358Vitvi05g02215Vitvi09g01616Vitvi07g02462Vitvi05g02038Vitvi06g00561
Vitvi06g01093Vitvi12g02238Vitvi10g02351Vitvi11g01323Vitvi08g02128Vitvi03g00206
Vitvi08g01403Vitvi13g01312Vitvi15g01355Vitvi09g01966Vitvi13g02355Vitvi19g02012
Vitvi19g01503Vitvi04g01519Vitvi17g00804Vitvi17g00119Vitvi19g01313Vitvi05g01842
Vitvi18g03070Vitvi12g02273Vitvi03g00325Vitvi02g01703Vitvi06g01980Vitvi11g00389
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Vitvi13g02026 Vitvi05g02093Vitvi14g02554Vitvi03g01337
Vitvi18g02649 Vitvi05g01370Vitvi16g00391Vitvi07g01078
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Vitvi07g01045 Vitvi08g01938Vitvi00g01769Vitvi13g01066
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Vitvi04g01836 Vitvi14g00296Vitvi05g02036Vitvi06g00709
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Vitvi18g00154 Vitvi06g00078Vitvi10g01620Vitvi01g00246
Vitvi13g02473 Vitvi05g01530Vitvi15g00918Vitvi09g02017
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Vitvi01g01949 Vitvi10g00478Vitvi13g01676Vitvi08g02168
Vitvi18g00470 Vitvi16g00515Vitvi16g01461Vitvi11g00022
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Vitvi18g00191 Vitvi03g01336Vitvi13g02423Vitvi11g00336
Vitvi13g02028 Vitvi18g00604Vitvi08g02081Vitvi01g00637
Vitvi13g00425 Vitvi02g00181Vitvi18g02873Vitvi07g01816
Vitvi15g01710 Vitvi08g02221Vitvi01g02134Vitvi01g02263
Vitvi19g00101 Vitvi13g02241Vitvi09g00809Vitvi07g01273
Vitvi11g01270 Vitvi14g02977Vitvi18g03065Vitvi12g00560
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Vitvi05g00930 Vitvi15g00570Vitvi16g01465Vitvi07g02969
Vitvi01g02105 Vitvi01g00546Vitvi13g02583Vitvi18g00181
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Vitvi03g00407Vitvi14g01685
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Vitvi16g00442Vitvi13g00994
Vitvi03g01714Vitvi16g00518
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Vitvi01g02312Vitvi08g01013
Vitvi12g00920Vitvi19g00285
Vitvi01g02156Vitvi10g00705
Vitvi03g01793Vitvi17g01275
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Figure 1. Transcriptome portrayal of the WS experiment reveals distinct trajectories for isohydric (MP) and anisohydric (SG) cultivars. (A) SOM transcriptome portraits of all samples studied. (B) The pairwise correlation map of the SOM portraits indicates two distinct clusters for the two cultivars, correlation squares along the diagonal due to the replicates, and off-diagonal correlations between different time points and stress-induced effects in both cultivars (see arrows). (C) The independent component plot of the portraits shows linear trajectories along the IC2 axis of both cultivars. IC1, IC2, and IC3 denote the first three independent components. (D) Sample SOM represents a two-dimensional presentation of the trajectories: Transcriptome trajectories separate due to isohydric and anisohydric cultivars in the horizontal direction and develop with time vertically with an additional increment due to WS. Dots inside each “Sample SOM” represent samples. The color code of samples is indicated in the bottom right corner.
Figure 1. Transcriptome portrayal of the WS experiment reveals distinct trajectories for isohydric (MP) and anisohydric (SG) cultivars. (A) SOM transcriptome portraits of all samples studied. (B) The pairwise correlation map of the SOM portraits indicates two distinct clusters for the two cultivars, correlation squares along the diagonal due to the replicates, and off-diagonal correlations between different time points and stress-induced effects in both cultivars (see arrows). (C) The independent component plot of the portraits shows linear trajectories along the IC2 axis of both cultivars. IC1, IC2, and IC3 denote the first three independent components. (D) Sample SOM represents a two-dimensional presentation of the trajectories: Transcriptome trajectories separate due to isohydric and anisohydric cultivars in the horizontal direction and develop with time vertically with an additional increment due to WS. Dots inside each “Sample SOM” represent samples. The color code of samples is indicated in the bottom right corner.
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Figure 2. Transcriptome dynamics under WS in isohydric (MP) and anisohydric (SG) water management. (A) The regions of characteristic overexpression as red areas labeled A–F (see “Overexpression map”) agree with regions of highest expression variance (see “Variance map”). (B) Spots usually contain a few hundred genes of different functional contexts (left). Expression profiles of the spots across all conditions reveal characteristic courses of transcriptomic co-regulation (right). (C) Transcriptome dynamics under WS is characterized by waterline portraits revealing different stress trajectories for SG and MP (gray arrows), time, as well as by spot activation patterns (spots jointly activated in the portraits are connected by lines at the time points indicated). The number of jointly expressed spots increases under WS, thus indicating a more complex transcriptomic pattern compared to the controls (see text).
Figure 2. Transcriptome dynamics under WS in isohydric (MP) and anisohydric (SG) water management. (A) The regions of characteristic overexpression as red areas labeled A–F (see “Overexpression map”) agree with regions of highest expression variance (see “Variance map”). (B) Spots usually contain a few hundred genes of different functional contexts (left). Expression profiles of the spots across all conditions reveal characteristic courses of transcriptomic co-regulation (right). (C) Transcriptome dynamics under WS is characterized by waterline portraits revealing different stress trajectories for SG and MP (gray arrows), time, as well as by spot activation patterns (spots jointly activated in the portraits are connected by lines at the time points indicated). The number of jointly expressed spots increases under WS, thus indicating a more complex transcriptomic pattern compared to the controls (see text).
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Figure 3. Topology of expression trajectories under WS. (A) The stress trajectories in the three-dimensional expression landscape. (B) Schematic spot activation along the T1-T2-T3 trajectory. (C) Gene ontology enrichment in spots A–F (biological processes in green, molecular functions in pink text).
Figure 3. Topology of expression trajectories under WS. (A) The stress trajectories in the three-dimensional expression landscape. (B) Schematic spot activation along the T1-T2-T3 trajectory. (C) Gene ontology enrichment in spots A–F (biological processes in green, molecular functions in pink text).
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Figure 4. Stilbenoid, diarylheptanoid, and gingerol biosynthetic pathway. (A) Genes of the pathway (downstream flow visualized by black arrows) are along the two STRS trajectories (gray arrows), indicating their condition-specific activation. (B) The heatmap shows the expression changes in response to WS. (C) KEGG pathway with gene color code derived from their positions in the SOM portrait indicated by the colored waterline portraits of SG CTRL and STRS and MP CTRL and STRS (see the lower right part).
Figure 4. Stilbenoid, diarylheptanoid, and gingerol biosynthetic pathway. (A) Genes of the pathway (downstream flow visualized by black arrows) are along the two STRS trajectories (gray arrows), indicating their condition-specific activation. (B) The heatmap shows the expression changes in response to WS. (C) KEGG pathway with gene color code derived from their positions in the SOM portrait indicated by the colored waterline portraits of SG CTRL and STRS and MP CTRL and STRS (see the lower right part).
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Figure 5. Thiamine biosynthetic pathway. (A) Map of the pathway (downstream flow visualized by black arrows). Genes accumulate in areas related to stress response, and the two STRS trajectories are shown by gray arrows. (B) Heatmap depicting the thiamine biosynthetic pathway gene expression in response to WS. (C) KEGG pathway with gene color code derived from their positions in the SOM portrait indicated by the colored waterline portraits of SG CTRL and STRS and MP CTRL and STRS (see the upper right part).
Figure 5. Thiamine biosynthetic pathway. (A) Map of the pathway (downstream flow visualized by black arrows). Genes accumulate in areas related to stress response, and the two STRS trajectories are shown by gray arrows. (B) Heatmap depicting the thiamine biosynthetic pathway gene expression in response to WS. (C) KEGG pathway with gene color code derived from their positions in the SOM portrait indicated by the colored waterline portraits of SG CTRL and STRS and MP CTRL and STRS (see the upper right part).
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Konecny, T.; Asatryan, A.; Nikoghosyan, M.; Binder, H. Unveiling Iso- and Aniso-Hydric Disparities in Grapevine—A Reanalysis by Transcriptome Portrayal Machine Learning. Plants 2024, 13, 2501. https://doi.org/10.3390/plants13172501

AMA Style

Konecny T, Asatryan A, Nikoghosyan M, Binder H. Unveiling Iso- and Aniso-Hydric Disparities in Grapevine—A Reanalysis by Transcriptome Portrayal Machine Learning. Plants. 2024; 13(17):2501. https://doi.org/10.3390/plants13172501

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Konecny, Tomas, Armine Asatryan, Maria Nikoghosyan, and Hans Binder. 2024. "Unveiling Iso- and Aniso-Hydric Disparities in Grapevine—A Reanalysis by Transcriptome Portrayal Machine Learning" Plants 13, no. 17: 2501. https://doi.org/10.3390/plants13172501

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