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Keywords = salicylic acid-based compounds

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25 pages, 24742 KB  
Article
Comprehensive UPLC-MS/MS Profiling of Bioactive Phenolics and Their MYB Regulatory Networks in Wild and Cultivated Strawberries
by Muhammad Junaid Rao, Kangjian Song, Sijiu He, Shirong He, Yuanqiao Li, Ima Mulyama Zainuddin, Yubo Chen, Xinnian Du, Wei Liu, Munsif Ali Shad, Maryam Tahira, Xiande Duan, Bingsong Zheng, Liuyuan Bao, Shunqiang Yang and Mingzheng Duan
Molecules 2026, 31(9), 1517; https://doi.org/10.3390/molecules31091517 - 3 May 2026
Viewed by 295
Abstract
Phenolic compounds are vital bioactive constituents in fruits, yet modern strawberry breeding has often reduced their diversity. Here, we employed a multi-omics approach integrating UPLC-MS/MS-based metabolomics and RNA-seq transcriptomics to investigate the divergence in phenolic profiles and their transcriptional regulation between a wild [...] Read more.
Phenolic compounds are vital bioactive constituents in fruits, yet modern strawberry breeding has often reduced their diversity. Here, we employed a multi-omics approach integrating UPLC-MS/MS-based metabolomics and RNA-seq transcriptomics to investigate the divergence in phenolic profiles and their transcriptional regulation between a wild strawberry (Fragaria nilgerrensis, HM) and three cultivated varieties (white ‘Danxue’ (DX), pink ‘Fenyu’ (FY), and red ‘Red Face 99’ (RF)). The wild HM genotype exhibited higher antioxidant activity and a significantly more complex phenolic profile, dominated by high-abundance galloylated and benzoylated glucosides (e.g., digallic acid methyl ester, salicylic acid-2-O-glucoside) that were largely absent or depleted in cultivated fruits. In contrast, the cultivated varieties displayed specialized yet simplified profiles: DX accumulated hydroxycinnamoyl galactonic acids, FY was enriched in feruloylated glucosides, and RF was characterized by coumaroyl-glucose derivatives. Transcriptomic analysis identified a set of MYB transcription factors (e.g., FxaYL_531g0581170, FxaYL_642g0175720) significantly upregulated in wild HM, with strong correlations to key bioactive phenolics such as 4-hydroxybenzoate and salicylic acid derivatives. These findings illustrate how selective breeding has reshaped phenolic composition through alterations in MYB regulatory networks. The wild strawberry germplasm thus represents a valuable natural reservoir for biofortification strategies aimed at restoring the nutritional and functional quality of modern strawberry cultivars. Full article
(This article belongs to the Special Issue Green Chemistry and Molecular Tools in Agriculture)
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14 pages, 1204 KB  
Article
Effects of Postharvest Application of Methyl Jasmonate (MeJA) and Methyl Salicylate (MeSA) on Storage of Yellow Pitahaya at Two Temperatures
by Alex Erazo-Lara, Blanca Alexandra Oñate-Bastidas, María Emma García-Pastor, Pedro Antonio Padilla-González, Vicente Agulló, María Serrano and Daniel Valero
Horticulturae 2026, 12(4), 398; https://doi.org/10.3390/horticulturae12040398 - 24 Mar 2026
Viewed by 690
Abstract
Yellow pitahaya (Selenicereus megalanthus Haw.) is increasing in popularity and is considered to be an exotic fruit with great potential for consumption due to its content of both nutritive and bioactive compounds with health-related properties. Pitahaya plants, grown in Ecuador, were treated [...] Read more.
Yellow pitahaya (Selenicereus megalanthus Haw.) is increasing in popularity and is considered to be an exotic fruit with great potential for consumption due to its content of both nutritive and bioactive compounds with health-related properties. Pitahaya plants, grown in Ecuador, were treated with two elicitors: methyl jasmonate (MeJA) and methyl salicylate (MeSA), both at a 0.1 mM concentration. After harvesting, the fruits were transported to Spain and stored at two temperatures, 2 and 10 °C, for 55 days. The analytical determinations were physiological parameters (ethylene and respiration rates), organoleptic traits [firmness, color, total soluble solids (TSSs) and total acidity (TA)], and phytonutrients (total phenolics, carotenoids and total antioxidant activity). The results show that all the parameters evolved more rapidly at 10 °C than at 2 °C, which is due to storage temperature effects on fruit metabolism. For TSSs, reductions were observed at the two temperatures, while, for TA, a major reduction was obtained at 2 °C. Regarding storage, the respiration rates increased, especially at 2 °C. At the end of storage, total phenolics were higher in treated pitahayas. Moreover, fruits developed chilling injury (CI) at 2 °C based on the highest respiration rate and accelerated softening. Collectively, all the data suggest that both MeJA and MeSA could modulate yellow pitahaya ripening without detrimental effects on quality during postharvest storage. Full article
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20 pages, 4202 KB  
Article
Activation of the Nrf2 Signaling Pathway by a Ginseng–Salvia Root–Notoginseng Composite Alleviates Ulcerative DSS-Induced Colitis via Restoring Gut Microbiota and the Intestinal Barrier
by Xinao Lyu, Liurong Zhang, Jia Si, Shasha Dai, Huaiyu Su, Shuhuan Lyu, Lin Chen, Jianwei Sun, Xiangqun Jin and Haiyan Li
Antioxidants 2026, 15(3), 320; https://doi.org/10.3390/antiox15030320 - 4 Mar 2026
Viewed by 986
Abstract
Current treatments for ulcerative colitis (UC) often fail to adequately address its multifactorial pathogenesis, which involves oxidative stress, barrier dysfunction, and gut microbiota dysbiosis. This study evaluated the therapeutic potential and multi-targeting mechanism of a ginseng, salvia root, and notoginseng oral solution (GSNS) [...] Read more.
Current treatments for ulcerative colitis (UC) often fail to adequately address its multifactorial pathogenesis, which involves oxidative stress, barrier dysfunction, and gut microbiota dysbiosis. This study evaluated the therapeutic potential and multi-targeting mechanism of a ginseng, salvia root, and notoginseng oral solution (GSNS) in a mouse model of colitis induced by dextran sulfate sodium (DSS). Based on high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) technology, 25 major bioactive components were identified. Following the induction of colitis with 3.5% DSS in C57BL/6J mice, the animals were treated with the GSNS (40, 80, or 160 mg/kg/day) or 5-Amino Salicylic Acid (5-ASA). The therapeutic efficacy was assessed via disease activity, histopathological staining, cytokines and oxidative stress analysis, and a barrier integrity test. Combined data from Western blot, qPCR, immunohistochemistry, electron microscopy, and 16S rRNA sequencing indicate that the therapeutic effect of the GSNS against colitis is attributable to its dual role in dampening pro-inflammatory cytokines and potentiating antioxidant defenses via the Nrf2/HO-1 signaling pathway. It also upregulated Occludin expression, repaired tight junctions, and was associated with beneficial alterations in the gut microbiota, as evidenced by increased Prevotellaceae and suppressing Escherichia-Shigella. These findings demonstrated that the GSNS exerts a multi-target effect against colitis by synergistically enhancing antioxidant defense, repairing the intestinal barrier, and modulating microbial ecology, supporting its potential as a promising natural compound-based candidate for DSS-induced colitis treatment. Full article
(This article belongs to the Special Issue Antioxidants as Adjuvants for Inflammatory Bowel Disease Treatment)
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19 pages, 1450 KB  
Article
Hormone-Specific Reprogramming of the Phenylpropanoid Network in Juvenile Quercus sideroxyla Leaves Revealed by Targeted Metabolomics
by Jessica Barragán-Zúñiga, Nuria Elizabeth Rocha-Guzmán, Jesús Omar Díaz-Rivas, Rubén Francisco González-Laredo, José Ángel Sigala-Rodríguez, José Alberto Gallegos-Infante and Martha Rocío Moreno-Jiménez
Plants 2026, 15(4), 548; https://doi.org/10.3390/plants15040548 - 10 Feb 2026
Viewed by 447
Abstract
Phytohormones are key regulators of specialized metabolism, yet hormone-specific and time-dependent phenolic reprogramming in woody species remains poorly resolved. This study evaluated the phenolic responses of juvenile Quercus sideroxyla leaves grown under controlled greenhouse conditions to salicylic acid (SA), jasmonic acid (JA), and [...] Read more.
Phytohormones are key regulators of specialized metabolism, yet hormone-specific and time-dependent phenolic reprogramming in woody species remains poorly resolved. This study evaluated the phenolic responses of juvenile Quercus sideroxyla leaves grown under controlled greenhouse conditions to salicylic acid (SA), jasmonic acid (JA), and abscisic acid (ABA) using a pulse-based elicitation design combined with targeted metabolite profiling. Aqueous acetone extracts exhibited high phenolic diversity, including phenolic acids (20 compounds), flavonoids (15 compounds), and hydrolyzable tannins (27 compounds). Partial least squares–discriminant analysis (PLS-DA), multivariate statistics (MANOVA), and Random Forest classification were employed to resolve hormone-specific phenolic signatures across time. Distinct regulatory trajectories were identified for each hormone. SA elicitation triggered a high-amplitude, pulsatile phenolic response primarily affecting precursor-associated phenolic acids and ellagic-related structures, consistent with transient metabolic priming. JA induced a gradual and sustained modulation of flavonoids and tannin pools, within which advanced caffeoylquinic esters, flavonol conjugates, and ellagitannins emerged as key discriminant markers. ABA treatment promoted progressive and stabilized accumulation across phenolic classes, supporting a role in metabolic homeostasis rather than stress induction. Biweekly sampling was essential to discriminate transient, adaptive, and stabilizing responses. Overall, the results demonstrate that Q. sideroxyla differentiates hormonal signals and translates them into distinct phenolic reprogramming patterns. The integration of time-resolved metabolomics with multivariate and machine-learning approaches provides a robust framework for hormone-guided modulation of phenolic metabolism in woody plants. Full article
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24 pages, 577 KB  
Article
Quality-by-Design Compounding of Semisolids Using an Electronic Mortar and Pestle Device for Compounding Pharmacies: Uniformity, Stability, and Cleaning
by Hudson Polonini, Carolina Schettino Kegele, Savvas Koulouridas and Marcone Augusto Leal de Oliveira
Pharmaceutics 2026, 18(2), 205; https://doi.org/10.3390/pharmaceutics18020205 - 4 Feb 2026
Viewed by 1178
Abstract
Background/Objectives: Manual preparation of semisolid formulations (creams, ointments, gels) is prone to variability in mixing energy and time, which may compromise uniform API distribution. This study aimed to evaluate an Electronic Mortar and Pestle (EMP; Unguator™) as a standardized compounding tool, with [...] Read more.
Background/Objectives: Manual preparation of semisolid formulations (creams, ointments, gels) is prone to variability in mixing energy and time, which may compromise uniform API distribution. This study aimed to evaluate an Electronic Mortar and Pestle (EMP; Unguator™) as a standardized compounding tool, with objectives to: (i) validate stability-indicating UHPLC methods; (ii) assess content uniformity across jar strata; (iii) quantify the impact of mixing time and rotation speed via design of experiments (DOE); and (iv) verify cleaning effectiveness and cross-contamination risk. Methods: Five representative formulations were compounded: urea 40%, clobetasol 0.05%, diclofenac 2.5% in hyaluronic acid 3% gel, urea 10% + salicylic acid 1%, and hydroquinone 5%. UHPLC methods were validated per ICH Q2(R2) and stress-tested under acid, base, oxidative, thermal, and UV conditions. Homogeneity was assessed by stratified sampling (top/middle/bottom). A 32 factorial DOE (time: 2/6/10 min; speed: 600/1500/2400 rpm) modeled effects on % label claim and RSD. Cleaning validation employed hydroquinone as a tracer, with swab sampling pre-/post-use and post-sanitization analyzed by HPLC. Results: All UHPLC methods met specificity, linearity, precision, accuracy, and sensitivity criteria and were stability-indicating (Rs ≥ 1.5). Formulations achieved 90–110% label claim with strata CV ≤ 5%. DOE revealed speed as the dominant factor for clobetasol, urea, and diclofenac, while time was more influential for salicylic acid; gels exhibited curvature, indicating diminishing returns at high rpm. Model-predicted optima were implementable on the Unguator™ with minor rounding of rpm/time. Cleaning validation confirmed post-sanitization residues below LOQ and <10 ppm acceptance. Conclusions: The Unguator™ provides a practical, parameter-controlled route for compounding pharmacies to standardize semisolid preparations, achieving reproducible layer-to-layer content uniformity within predefined criteria under the evaluated conditions through programmable set-points and validated cycles. DOE-derived rpm–time relationships define an operational design space within the studied ranges and support selection of implementable device settings and set-points. Importantly, the DOE-derived “optima” in this study are optimized for assay-based content uniformity (mean % label claim and strata variability). Cleaning validation supports a closed, low-cross-contamination workflow, facilitating consistent routines for both routine and complex formulations. Overall, the work implements selected QbD elements (QTPP—Quality Target Product Profile; CQA—Critical Quality Attribute definition; CPP—Critical Process Parameter identification; operational design space; and a proposed control strategy) and should be viewed as a step toward broader lifecycle QbD implementation in compounding. Full article
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33 pages, 5414 KB  
Article
Modulation of the Genetic Response in Vitis vinifera L. Against the Oomycete Plasmopara viticola, Causing Grapevine Downy Mildew, Through the Action of Different Basic Substances
by Diego Llamazares De Miguel, Amaia Mena-Petite, Marie-France Corio-Costet, Juan Nieto, José R. Fernández-Navarro and Ana M. Díez-Navajas
Horticulturae 2026, 12(1), 112; https://doi.org/10.3390/horticulturae12010112 - 20 Jan 2026
Viewed by 951
Abstract
Grapevine downy mildew is a major disease in vineyards all around the world, caused by the oomycete Plasmopara viticola (Berk. & M. A. Curtis) Berl. & De Toni. Normally, its control depends almost exclusively on chemical and copper-based fungicides, especially in high-incidence areas [...] Read more.
Grapevine downy mildew is a major disease in vineyards all around the world, caused by the oomycete Plasmopara viticola (Berk. & M. A. Curtis) Berl. & De Toni. Normally, its control depends almost exclusively on chemical and copper-based fungicides, especially in high-incidence areas with high relative humidity and mild temperatures. However, the European Union is determined to reduce the application of these phytochemicals by at least 50% by 2030, forcing winegrowers to seek alternative low-input strategies for proper sanitary maintenance. Basic substances (BSs), described in European Regulation (EC) 1107/2009, stand out as promising alternatives, but their molecular mechanism of action remains mostly unknown. In this context, this study analyzed the genetic effect in grapevine plants of several commercial products composed of BSs (chitosan, soy lecithin, Equisetum arvense and Salix cortex). All products exhibited promising results, triggering the induction of similar defence mechanisms, which included pathogenesis-related proteins (PRs), involved in direct pathogen repression; stilbenes, capable of producing antimicrobial compounds such as resveratrol and pterostilbene; several hormones, including oxylipins, ethylene, salicylic acid and terpenes, mediating immune signalling; and genes related to structural features of the plant, such as lignin, callose, cellulose and cuticular wax, constituting a first physiological barrier against P. viticola. Disease severity reduction differed among treatments, with Salix cortex showing the highest efficacy (58%), followed by BABA (38%) and LESOY (35%), while LECI and CHIT had minor effects (<9%). Gene expression analyses revealed that Salix cortex modulated the highest percentage of genes (41%), followed by natural infection without treatment (32%), LESOY (27%), BABA (26%), LECI (23%) and CHIT (23%). In terms of defence mechanisms, Salix cortex promoted the most pathways, LESOY induced eight, BABA and LECI seven and CHIT five. Overall, these results indicate that BSs can modulate several defence pathways in grapevine, supporting their potential use as sustainable alternatives for controlling downy mildew. Full article
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14 pages, 2588 KB  
Article
Scavenging for Hydroxybenzoic Acids in Cupriavidus necator: Studying Ligand Sensitivity Using a Biosensor-Based Approach
by Ingrida Sabaliauske, Ernesta Augustiniene, Rizkallah Al Akiki Dit Al Mazraani, Monika Tamasauskaite and Naglis Malys
Biomolecules 2026, 16(1), 157; https://doi.org/10.3390/biom16010157 - 15 Jan 2026
Viewed by 737
Abstract
The increasing demand for rapid identification of bacteria capable of degrading environmentally relevant organic compounds highlights the need for scalable and selective analytical tools. Cupriavidus necator catabolizes several hydroxybenzoic acids, including 2-hydroxybenzoate (salicylate, 2-HBA), 4-hydroxybenzoate (4-HBA), and 3-hydroxybenzoate (3-HBA), funneling them into central [...] Read more.
The increasing demand for rapid identification of bacteria capable of degrading environmentally relevant organic compounds highlights the need for scalable and selective analytical tools. Cupriavidus necator catabolizes several hydroxybenzoic acids, including 2-hydroxybenzoate (salicylate, 2-HBA), 4-hydroxybenzoate (4-HBA), and 3-hydroxybenzoate (3-HBA), funneling them into central aromatic catabolism via monooxygenation to 2,5-dihydroxybenzoate (gentisate, 2,5-dHBA) and 3,4-dihydroxybenzoate (protocatechuate, 3,4-dHBA) followed by the oxidative cleavage reaction, enabling complete conversion to tricarboxylic acid (TCA) cycle intermediates. To quantify how readily C. necator is able to activate catabolic genes in response to hydroxybenzoic acid, an extracellular ligand, we applied an approach centered on a transcription-factor (TF)-based biosensor that combines ligand-bound regulator activity with a fluorescent reporter. This approach allowed to evaluate the ligand sensitivity by determining gene activation threshold ACmin and half-maximal effective concentration EC50. Amongst studied hydroxybenzoic acids, 2-HBA and 4-HBA sensors from C. necator showed very low thresholds 4.8 and 2.4 μM and EC50 values of 19.91 and 13.06 μM, indicating high sensitivity to these compounds and implicating a scavenging characteristic of associated catabolism. This study shows that the TF-based-biosensor approach applied for mapping functional sensing ranges of hydroxybenzoates combined with the research and informatics of catabolism can advance our understanding of how gene expression regulation systems have evolved to respond differentially to the availability and concentration of carbon sources. Furthermore, it can inform metabolic engineering strategies in the prevention of premature pathway activation or in predicting competitive substrate hierarchies in complex mixed environments. Full article
(This article belongs to the Section Biological Factors)
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22 pages, 2173 KB  
Review
Stress-Induced Plant Specialized Metabolism: Signaling, Multi-Omics Integration, and Plant-Derived Antimicrobial Metabolites to Combat Antimicrobial Resistance
by Luis Enrique Pérez-Sánchez, Luis Mario Ayala-Guerrero, Aarón Mendieta-Moctezuma, Miguel Angel Villalobos-López and Selma Ríos-Meléndez
Plants 2026, 15(2), 193; https://doi.org/10.3390/plants15020193 - 8 Jan 2026
Cited by 1 | Viewed by 1450
Abstract
Antimicrobial resistance (AMR) is one of the major health threats of the 21st century and demands innovative sources of bioactive compounds. In 2019, infections caused by resistant bacteria directly accounted for 1.27 million deaths and contributed to an additional 4.95 million associated deaths, [...] Read more.
Antimicrobial resistance (AMR) is one of the major health threats of the 21st century and demands innovative sources of bioactive compounds. In 2019, infections caused by resistant bacteria directly accounted for 1.27 million deaths and contributed to an additional 4.95 million associated deaths, underscoring the urgency of exploring new strategies. Among emerging alternatives, specialized plant metabolites stand out, as their biosynthesis is enhanced under biotic or abiotic stress. These stimuli increase reactive oxygen species (ROS), activate cascades regulated by mitogen-activated protein kinases (MAPKs), and trigger defense-related hormonal pathways involving salicylic acid (SA), jasmonic acid (JA), ethylene (ET), and abscisic acid (ABA), which in turn regulate transcription factors and biosynthetic modules, promoting the accumulation of compounds with antimicrobial activity. In this review, we synthesize recent literature (2020–2025) with emphasis on studies that report quantitative activity metrics. We integrate evidence linking stress physiology and metabolite production, summarize mechanisms of action, and propose a conceptual multi-omics pipeline, synthesized from current best practices, that combines RNA sequencing and LC/GC-MS-based metabolomics with bioinformatic tools to prioritize candidates with antimicrobial potential. We discuss elicitation strategies and green extraction, highlight bryophytes (e.g., Pseudocrossidium replicatum) as a differentiated chemical source, and explore citrus Huanglongbing (HLB) as a translational case study. We conclude that integrating stress physiology, multi-omics, and functional validation can accelerate the transition of stress-induced metabolites toward more sustainable and scalable medical and agricultural applications. Full article
(This article belongs to the Special Issue Insights and Regulation of Plant Growth and Metabolism)
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20 pages, 6675 KB  
Article
Characterization of Volatile Profile of Different Kiwifruits (Actinidia chinensis Planch) Varieties and Regions by Headspace-Gas Chromatography-Ion Mobility Spectrometry
by Lijuan Du, Yanan Bi, Jialiang Xiong, Xue Mu, Dacheng Zhai, Weixiang Chen, Hongcheng Liu and Yanping Ye
Foods 2026, 15(1), 152; https://doi.org/10.3390/foods15010152 - 3 Jan 2026
Cited by 1 | Viewed by 778
Abstract
The flavor and aroma of kiwifruit are largely influenced by the concentration of Volatile Organic Compounds (VOCs). To analyze the volatile profiles and identify characteristic aroma compounds, this study utilized Gas Chromatography-Ion Mobility Spectrometry (GC-IMS) to analyze the aromatic compounds sourced from seven [...] Read more.
The flavor and aroma of kiwifruit are largely influenced by the concentration of Volatile Organic Compounds (VOCs). To analyze the volatile profiles and identify characteristic aroma compounds, this study utilized Gas Chromatography-Ion Mobility Spectrometry (GC-IMS) to analyze the aromatic compounds sourced from seven major production regions in China and New Zealand, covering red-, green-, and yellow-fleshed varieties. A total of 77 VOCs were identified, with esters, aldehydes, and ketones as the dominant classes. Significant regional and varietal differences were observed: red-fleshed kiwifruits from Yunnan exhibited high levels of 2-Vinyl-5-methylfuran, Ethyl formate, and 1-Penten-3-one; green-fleshed fruits from Shaanxi were rich in Limonene and Methyl hexanoate, and those from Yunnan were rich in 1-Propanol and 1-Hexanol; and yellow-fleshed fruits from Henan were characterized by Methyl salicylate and 3-Hydroxy-2-butanone. Orthogonal partial least squares discriminant analysis (OPLS-DA) successfully classified kiwifruits by origin and variety, confirming the stability and predictive power of the model (Q2Y > 0.97). This study also elucidated the key metabolic pathways—including lipid oxidation, amino acid degradation, and terpenoid metabolism—underlying the formation of these characteristic VOCs. These findings provide a theoretical foundation for the biochemical regulation of kiwifruit flavor and support the development of origin-tracing and quality-assessment tools based on VOC fingerprints. Full article
(This article belongs to the Section Food Analytical Methods)
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18 pages, 1552 KB  
Article
Humic Substances from Different Sources Modulate Salicylic Acid-Mediated Defense in Plants Infected by Powdery Mildew
by Rakiely M. Silva, Vicente Mussi-Dias, Fábio L. Olivares, Lázaro E. P. Peres and Luciano P. Canellas
Plants 2025, 14(24), 3854; https://doi.org/10.3390/plants14243854 - 17 Dec 2025
Viewed by 846
Abstract
Modern agriculture relies heavily on chemical inputs to sustain productivity, yet their intensive use poses environmental and health risks. Sustainable strategies based on biostimulants have emerged as promising alternatives to reduce agrochemical dependence. Among these compounds, humic substances (HS) stand out for their [...] Read more.
Modern agriculture relies heavily on chemical inputs to sustain productivity, yet their intensive use poses environmental and health risks. Sustainable strategies based on biostimulants have emerged as promising alternatives to reduce agrochemical dependence. Among these compounds, humic substances (HS) stand out for their ability to modulate plant growth and activate defense responses. This study aimed to evaluate the effects of HS from different sources—vermicompost (Vc) and peat (Pt)—on the salicylic acid (SA)-mediated defense pathway in tomato plants (Solanum lycopersicum cv. Micro-Tom) infected with Oidium sp. The HS were characterized by solid-state 13C CPMAS NMR to determine the relative distribution of carbon functional groups and structural domains, including alkyl, O-alkyl, aromatic, and carbonyl carbon fractions, as well as hydrophobicity-related indices. Enzymatic activities of lipoxygenase, peroxidase, phenylalanine ammonia lyase, and beta 1,3-glucanase were determined spectrophotometrically, and RT-qPCR quantified gene transcription levels involved in SA signaling and defense (MED25, MED16, MED14, NPR1, ICS, PAL, LOX1.1, MYC2, JAZ, jar1, CAT, POX, SOD, APX, ERF, PR-1, PR-2, PR-4 e PR-5). Both HS significantly reduced disease severity and activated key SA-related defense genes, including the regulatory gene NPR1 and the effector genes PR1, PR2 and PR5, with Pt providing greater protection. Notably, HS amplified defense-related gene expression and enzymatic activities specifically under infection, showing a stronger induction than in non-infected plants. These results demonstrate that structural differences among HS drive distinct and enhanced defense responses under pathogen challenge, highlighting their potential as sustainable tools for improving plant immunity in agricultural systems. Full article
(This article belongs to the Section Plant Protection and Biotic Interactions)
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28 pages, 2584 KB  
Article
Whole-Genome Analysis of PGP Endophytic Bacillus subtilis 10-4: Unraveling Molecular Insights into Plant Growth and Stress Resilience
by Oksana Lastochkina and Liudmila Pusenkova
Int. J. Mol. Sci. 2025, 26(24), 11904; https://doi.org/10.3390/ijms262411904 - 10 Dec 2025
Cited by 1 | Viewed by 1320
Abstract
The endophytic bacterium Bacillus subtilis 10-4 is a potent bioinoculant, previously shown to enhance growth and resilience to abiotic/biotic stresses across various crops. However, the genetic basis underlying these beneficial traits remains unexplored. In this study, a whole-genome analysis of B. subtilis 10-4 [...] Read more.
The endophytic bacterium Bacillus subtilis 10-4 is a potent bioinoculant, previously shown to enhance growth and resilience to abiotic/biotic stresses across various crops. However, the genetic basis underlying these beneficial traits remains unexplored. In this study, a whole-genome analysis of B. subtilis 10-4 was performed to gain the molecular determinants of its plant-beneficial effects. The Illumina MiSeq-based assembly revealed a genome of 4,278,582 bp (43.5% GC content) distributed across 19 contigs, encoding 4314 predicted protein-coding sequences, 42 tRNAs, and 6 rRNAs. This genomic architecture is comparable to other sequenced B. subtilis strains. The genomic annotation identified 331 metabolic subsystems with a total number of 1668 functions, predominantly associated with amino acid (281) (16.9%) and carbohydrate (247) (14.9%) metabolism. In silico genomic analysis uncovered a diverse repertoire of genes significant for plant growth and stress resilience. These included genes for colonization (i.e., exopolysaccharide production, biofilm formation, adhesion, motility, and chemotaxis), nutrient acquisition (i.e., nitrogen, phosphorus, iron, potassium, and sulfur metabolisms), and synthesis of bioactive compounds (auxins, salicylic acid, siderophores, gamma-aminobutyric acid, vitamins, and volatiles) and antimicrobials. The latter was supported by identified biosynthetic gene clusters (BGCs) for known antimicrobials (100% similarity) bacilysin, bacillaene, subtilosin A, and bacillibactin, as well as clusters for surfactin (82%), fengycin (80%), and plipastatin (46%), alongside a unique terpene cluster with no known similarity. Additionally, genes conferring abiotic stress tolerance via glutathione metabolism, osmoprotectants (e.g., proline, glycine betaine), detoxification, and general stress response were identified. The genomic evidence was consistent with observed plant growth improvements in laboratory assays (radish, oat) and a field trial (wheat) upon 10-4 inoculation. Thus, the findings elucidate the genomic background of B. subtilis 10-4’s beneficial effects, solidifying its potential for utilization as a bioinoculant in sustainable crop production under changing climate accompanied by multiple environmental stresses. Full article
(This article belongs to the Special Issue Plant Responses to Microorganisms and Insects)
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19 pages, 22244 KB  
Article
Salicylic Acid Mitigates Lead-Induced Stress in the Endangered Shrub Cistus heterophyllus subsp. carthaginensis
by Antonio López-Orenes, María A. Ferrer and Antonio A. Calderón
Agronomy 2025, 15(12), 2792; https://doi.org/10.3390/agronomy15122792 - 3 Dec 2025
Viewed by 779
Abstract
Lead (Pb) contamination severely threatens plant health and biodiversity, particularly in mining-affected ecosystems. The phytohormone, salicylic acid (SA), plays a crucial role in regulating plant stress responses. Here, the effect of SA supplementation on the in vitro response of Cistus heterophyllus subsp. carthaginensis [...] Read more.
Lead (Pb) contamination severely threatens plant health and biodiversity, particularly in mining-affected ecosystems. The phytohormone, salicylic acid (SA), plays a crucial role in regulating plant stress responses. Here, the effect of SA supplementation on the in vitro response of Cistus heterophyllus subsp. carthaginensis, a critically endangered Mediterranean shrub, to Pb stress (50 μM Pb(NO3)2) was evaluated. SA dose pretreatment (100 μM) was selected based on phenolic accumulation in leaf tissues. Physiological and biochemical parameters—including mineral content, photosynthetic performance, total phenolics, and antioxidant activity—were quantitatively analyzed. SA pretreatment markedly reduced Pb accumulation (25%) while promoting Fe (73%), K (29%), and Mn (15%) uptake. It also alleviated Pb-induced photosynthetic impairment, preserved chloroplast integrity, increased chlorophyll content, and reduced the accumulation of lipid peroxidation products. Furthermore, SA promoted the accumulation of phenolic compounds—such as flavonoids, (+)-catechin, gallic acid, and hydroxycinnamic acid derivatives—in Pb-treated shoots, resulting in increased antioxidant capacity, as reflected by DPPH and FRAP assays, and protection against lipid autooxidation. However, no differential effect of SA pretreatment on DNA protection against oxidative damage was observed. Overall, SA acted as an effective priming agent, maintaining mineral homeostasis, photosynthetic stability, and antioxidant defense under Pb stress. These findings highlight its potential for enhancing plant resilience to Pb toxicity and for supporting the conservation and reintroduction of C. heterophyllus in contaminated habitats. Full article
(This article belongs to the Section Plant-Crop Biology and Biochemistry)
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26 pages, 9831 KB  
Article
Fermented Nettles: Bioactive Profile and Seasonal Variability
by Romana Praženicová, Andrei Larkov, Kateřina Hanzelková, Anton Korban, Tomáš Křížek, Veronika Hýsková, Tomáš Ječmen, Jakub Hraníček, Denisa Vlčková, Alena Gaudinová, Petre Dobrev, Radomíra Vanková, Helena Ryšlavá and Kateřina Bělonožníková
Nitrogen 2025, 6(4), 109; https://doi.org/10.3390/nitrogen6040109 - 24 Nov 2025
Cited by 1 | Viewed by 1890
Abstract
In traditional horticulture, fermented nettles (FN) enhance plant growth and resilience. However, their precise mode of action remains unclear. This study aims to characterize the bioactive profile of FN and to evaluate their potential as biostimulants beyond organic fertilizers. For this purpose, FN [...] Read more.
In traditional horticulture, fermented nettles (FN) enhance plant growth and resilience. However, their precise mode of action remains unclear. This study aims to characterize the bioactive profile of FN and to evaluate their potential as biostimulants beyond organic fertilizers. For this purpose, FN samples were prepared from Urtica dioica L. harvested in different seasons and analyzed by mass spectrometry (ICP-MS, LC-MS/MS, and GC×GC-MS), electrophoresis, and spectrophotometry to quantify macro- and micronutrients, nitrogen compounds, phytohormones, antioxidant capacity, enzyme activities, and microbial viability. The results show that FN are rich in essential nutrients (N, K, Ca, Fe, and Zn), hydrolytic enzymes (proteases, glycosidases and phosphatases), and phytohormones (auxins, cytokinins, gibberellins, abscisic acid, and salicylic acid). FN contain volatile compounds with potential antimicrobial effects, in addition to strong antioxidant properties. The monitored parameters support the dual role of FN as fertilizers and biostimulants, suggesting that FN act synergistically through nutrient enrichment, enzymatic degradation of macromolecules, hormonal signaling, and microbial priming. Based on our data, particularly because of the highest microbial viability and enzyme activities, the summer FN seem like the most suitable option. Moreover, the seasonal variability in composition highlights the importance of timing the harvest to optimize FN efficacy in sustainable agriculture. Full article
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21 pages, 6894 KB  
Article
Abiotic Stress Alters the Nutritional, Metabolomic, and Glycomic Profiles of Piper auritum Kunth
by Adriana Chico-Peralta, Mar Villamiel, Paola Isabel Angulo-Bejarano and Aurea K. Ramírez-Jiménez
Foods 2025, 14(20), 3543; https://doi.org/10.3390/foods14203543 - 17 Oct 2025
Cited by 1 | Viewed by 982
Abstract
Traditional diets based on diverse edible plants are increasingly threatened by climate change, which exposes crops to abiotic and biotic stressors such as drought, soil salinity, UV radiation, microorganisms, and insect herbivory. Understanding how these conditions influence both the nutritional and nutraceutical profiles, [...] Read more.
Traditional diets based on diverse edible plants are increasingly threatened by climate change, which exposes crops to abiotic and biotic stressors such as drought, soil salinity, UV radiation, microorganisms, and insect herbivory. Understanding how these conditions influence both the nutritional and nutraceutical profiles, as well as the availability of key compounds, is essential to preserve their functional value. Piper auritum Kunth, used in Mexican gastronomy, was selected to assess two abiotic stress scenarios: drought stress (DS) and salicylic acid (SA) to simulate plant defense against pathogens and/or predators. We evaluated proximate composition, dietary fiber, total phenolics, total flavonoids, antioxidant capacity, low molecular weight carbohydrates (LMWCs), monomeric composition, and essential oil volatiles. Additionally, the simulated gastrointestinal digestion (INFOGEST) with an additional rat small-intestine extract (RSIE) revealed that both SA and DS shifted sugar distribution, especially for soluble and structural pools. SA treatment correlated with synthesis of secondary metabolites, particularly oxygenated and hydrocarbon terpenes. Both abiotic stressors modulated LMWC release during digestion, altering the distribution of sugars such as raffinose and galacturonic acid, with potential prebiotic implications. Essential oil analysis revealed stress-specific shifts in volatile composition, particularly in safrole, β-caryophyllene, and related terpenes. Beyond individual compound changes, the combined evaluation of composition, antioxidant properties, and volatile profile provides a comprehensive view of how abiotic stress can reshape the functional potential of P. auritum. To our knowledge, this is the first report on LMWC relative abundance across INFOGEST stages for a quelite species and on the integrated effect of DS and SA on its chemical profile. These findings highlight the importance of including compound release and functional traits, alongside chemical characterization, in future assessments of traditional plants under climate-related stress to safeguard their contribution to sustainable diets. Full article
(This article belongs to the Special Issue Recent Advances in Carbohydrate Functionality in Foods)
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23 pages, 709 KB  
Article
Analysis of the Phenolic Profile of Chelidonium majus L. and Its Combination with Sericin: Balancing Antimicrobial Activity and Cytocompatibility
by Ana Borges, José Luis Ordóñez-Díaz, Yara Aquino, José Manuel Moreno-Rojas, María Luisa Martín Calvo, Josiana A. Vaz and Ricardo C. Calhelha
Int. J. Mol. Sci. 2025, 26(20), 9911; https://doi.org/10.3390/ijms26209911 - 11 Oct 2025
Cited by 3 | Viewed by 1257
Abstract
The incorporation of bioactive natural compounds into biomedical applications offers a promising route to enhance therapeutic efficacy while supporting sustainability. In this study, we investigated the synergistic potential of Sericin, a silk-derived biopolymer, and Chelidonium majus L. (C. majus), a medicinal [...] Read more.
The incorporation of bioactive natural compounds into biomedical applications offers a promising route to enhance therapeutic efficacy while supporting sustainability. In this study, we investigated the synergistic potential of Sericin, a silk-derived biopolymer, and Chelidonium majus L. (C. majus), a medicinal plant with a diverse phenolic profile, in relation to biological activities relevant for wound care and infection control. A combined experimental strategy was applied, integrating detailed chemical characterization of C. majus extracts with antimicrobial and cytocompatibility assays across different Sericin–plant extract ratios (1:1, 1:2, 2:2, and 2:1). Phytochemical analysis identified and quantified 57 phenolic compounds, including high levels of flavonoids (quercetin, kaempferol, isorhamnetin) and phenolic acids (caffeic and ferulic acid). Salicylic acid (123.6 µg/g), feruloyltyramine (111.8 µg/g), and pinocembrin (98.4 µg/g) were particularly abundant, compounds previously reported to disrupt microbial membranes and impair bacterial viability. These metabolites correlated with the strong antimicrobial activity of C. majus against Gram-positive strains (MIC = 5–10 mg/mL). In combination with Sericin, antimicrobial performance was ratio-dependent, with higher proportions of C. majus (2:1) retaining partial inhibitory effects. Cytocompatibility assays with HFF1 fibroblasts demonstrated low antiproliferative activity across most formulations (GI50 > 400 µg/mL), supporting their potential safety in topical applications. Collectively, the results indicate a concentration-dependent interaction between C. majus phenolics and the Sericin protein matrix, reinforcing their suitability as candidates for natural-based wound healing materials. Importantly, the valorization of Sericin, an underutilized byproduct of the silk industry, together with a widely accessible medicinal plant, underscores the ecological and economic sustainability of this approach. Overall, this work supports the exploration of the development of biomaterials with potential for advancing tissue repair and wound management. Full article
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