New Insights of Plants to Combined Stresses

A special issue of Plants (ISSN 2223-7747). This special issue belongs to the section "Plant Response to Abiotic Stress and Climate Change".

Deadline for manuscript submissions: closed (20 March 2023) | Viewed by 10729

Special Issue Editor

1. Department of Food Science, Aarhus University, 8200 Aarhus N, Denmark
2. Key Laboratory of Biology and Germplasm Enhancement of Horticultural Crops in East China, Ministry of Agriculture, College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
Interests: abiotic stress; plant physiology; high throughput sequencing; photosynthesis; noncoding RNAs
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Special Issue Information

Dear Colleagues,

The pace at which climate change has accelerated in recent years has been phenomenal, and plants are suffering stress conditions induced by climate change. This is particularly worrisome for crops that humans rely on for food security, but more importantly, climate change is leading to combined changes in several environmental factors, which is resulting in combined stresses. Combined stress can cause synergetic, antagonistic, or equal effects in plants depending on stress intensity, duration, species, genotype, and so on, which make the response of each plant to combined stress unique. Compared with that to individual stress, plants’ response to combined stress requires further investigation (i.e., combined abiotic stress or combined biotic and abiotic stress), and therefore, more studies are urgently needed to clarify the response of plants to combined stress, which can produce tolerant regulatory mechanisms and lead to the cultivation of more resilient crops.

Dr. Rong Zhou
Guest Editor

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Keywords

  • combined stress
  • plant response
  • climate change
  • regulatory mechanism

Published Papers (4 papers)

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21 pages, 1939 KiB  
Article
Young Tomato Plants Respond Differently under Single or Combined Mild Nitrogen and Water Deficit: An Insight into Morphophysiological Responses and Primary Metabolism
by Joana Machado, Marta W. Vasconcelos, Cristiano Soares, Fernanda Fidalgo, Ep Heuvelink and Susana M. P. Carvalho
Plants 2023, 12(5), 1181; https://doi.org/10.3390/plants12051181 - 5 Mar 2023
Cited by 5 | Viewed by 2058
Abstract
This study aimed to understand the morphophysiological responses and primary metabolism of tomato seedlings subjected to mild levels of nitrogen and/or water deficit (50% N and/or 50% W). After 16 days of exposure, plants grown under the combined deficit showed similar behavior to [...] Read more.
This study aimed to understand the morphophysiological responses and primary metabolism of tomato seedlings subjected to mild levels of nitrogen and/or water deficit (50% N and/or 50% W). After 16 days of exposure, plants grown under the combined deficit showed similar behavior to the one found upon exposure to single N deficit. Both N deficit treatments resulted in a significantly lower dry weight, leaf area, chlorophyll content, and N accumulation but in a higher N use efficiency when compared to control (CTR) plants. Moreover, concerning plant metabolism, at the shoot level, these two treatments also responded in a similar way, inducing higher C/N ratio, nitrate reductase (NR) and glutamine synthetase (GS) activity, expression of RuBisCO encoding genes as well as a downregulation of GS2.1 and GS2.2 transcripts. Interestingly, plant metabolic responses at the root level did not follow the same pattern, with plants under combined deficit behaving similarly to W deficit plants, resulting in enhanced nitrate and proline concentrations, NR activity, and an upregulation of GS1 and NR genes than in CTR plants. Overall, our data suggest that the N remobilization and osmoregulation strategies play a relevant role in plant acclimation to these abiotic stresses and highlight the complexity of plant responses under a combined N+W deficit. Full article
(This article belongs to the Special Issue New Insights of Plants to Combined Stresses)
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18 pages, 2378 KiB  
Article
Exogenous Melatonin Alters Stomatal Regulation in Tomato Seedlings Subjected to Combined Heat and Drought Stress through Mechanisms Distinct from ABA Signaling
by Nikolaj Bjerring Jensen, Carl-Otto Ottosen and Rong Zhou
Plants 2023, 12(5), 1156; https://doi.org/10.3390/plants12051156 - 3 Mar 2023
Cited by 9 | Viewed by 1962
Abstract
The understanding of stomatal regulation in climate stress is essential for ensuring resilient crops. The investigation of the stomatal regulation in combined heat and drought stress aimed to link effects of exogenous melatonin on stomatal conductance (gs) and its mechanistic interactions [...] Read more.
The understanding of stomatal regulation in climate stress is essential for ensuring resilient crops. The investigation of the stomatal regulation in combined heat and drought stress aimed to link effects of exogenous melatonin on stomatal conductance (gs) and its mechanistic interactions with ABA or ROS signaling. Melatonin-treated and non-treated tomato seedlings were subjected to moderate and severe levels of heat (38°C for one or three days) and drought stress (soil relative water content of 50% or 20%) applied individually and in combination. We measured gs, stomatal anatomy, ABA metabolites and enzymatic ROS scavengers. The stomata in combined stress responded predominantly to heat at soil relative water content (SRWC) = 50% and to drought stress at SRWC = 20%. Drought stress increased ABA levels at severe stress, whereas heat stress caused an accumulation of the conjugated form, ABA glucose ester, at both moderate and severe stress. The melatonin treatment affected gs and the activity of ROS scavenging enzymes but had no effect on ABA levels. The ABA metabolism and conjugation of ABA might play a role in stomatal opening toward high temperatures. We provide evidence that melatonin increases gs in combined heat and drought stress, but the effect is not mediated through ABA signaling. Full article
(This article belongs to the Special Issue New Insights of Plants to Combined Stresses)
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25 pages, 2572 KiB  
Article
The Combination of Both Heat and Water Stresses May Worsen Botryosphaeria Dieback Symptoms in Grapevine
by Olivier Fernandez, Christelle Lemaître-Guillier, Aurélie Songy, Guillaume Robert-Siegwald, Marc-Henri Lebrun, Philippe Schmitt-Kopplin, Philippe Larignon, Marielle Adrian and Florence Fontaine
Plants 2023, 12(4), 753; https://doi.org/10.3390/plants12040753 - 8 Feb 2023
Cited by 6 | Viewed by 1824
Abstract
(1) Background: Grapevine trunk diseases (GTDs) have become a global threat to vineyards worldwide. These diseases share three main common features. First, they are caused by multiple pathogenic micro-organisms. Second, these pathogens often maintain a long latent phase, which makes any research in [...] Read more.
(1) Background: Grapevine trunk diseases (GTDs) have become a global threat to vineyards worldwide. These diseases share three main common features. First, they are caused by multiple pathogenic micro-organisms. Second, these pathogens often maintain a long latent phase, which makes any research in pathology and symptomatology challenging. Third, a consensus is raising to pinpoint combined abiotic stresses as a key factor contributing to disease symptom expression. (2) Methods: We analyzed the impact of combined abiotic stresses in grapevine cuttings artificially infected by two fungi involved in Botryosphaeria dieback (one of the major GTDs), Neofusicoccum parvum and Diplodia seriata. Fungal-infected and control plants were subjected to single or combined abiotic stresses (heat stress, drought stress or both). Disease intensity was monitored thanks to the measurement of necrosis area size. (3) Results and conclusions: Overall, our results suggest that combined stresses might have a stronger impact on disease intensity upon infection by the less virulent pathogen Diplodia seriata. This conclusion is discussed through the impact on plant physiology using metabolomic and transcriptomic analyses of leaves sampled for the different conditions. Full article
(This article belongs to the Special Issue New Insights of Plants to Combined Stresses)
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15 pages, 2904 KiB  
Systematic Review
How Do Plants Respond to Combined Drought and Salinity Stress?—A Systematic Review
by Prodipto Bishnu Angon, Md. Tahjib-Ul-Arif, Samia Islam Samin, Ummya Habiba, M. Afzal Hossain and Marian Brestic
Plants 2022, 11(21), 2884; https://doi.org/10.3390/plants11212884 - 28 Oct 2022
Cited by 32 | Viewed by 4391
Abstract
Plants are frequently exposed to one or more abiotic stresses, including combined salinity-drought, which significantly lowers plant growth. Many studies have been conducted to evaluate the responses of plants to combined salinity and drought stress. However, a meta-analysis-based systematic review has not been [...] Read more.
Plants are frequently exposed to one or more abiotic stresses, including combined salinity-drought, which significantly lowers plant growth. Many studies have been conducted to evaluate the responses of plants to combined salinity and drought stress. However, a meta-analysis-based systematic review has not been conducted yet. Therefore, this study analyzed how plants respond differently to combined salinity-drought stress compared to either stress alone. We initially retrieved 536 publications from databases and selected 30 research articles following a rigorous screening. Data on plant growth-related, physiological, and biochemical parameters were collected from these selected articles and analyzed. Overall, the combined salinity-drought stress has a greater negative impact on plant growth, photosynthesis, ionic balance, and oxidative balance than either stress alone. In some cases, salinity had a greater impact than drought stress and vice versa. Drought stress inhibited photosynthesis more than salinity, whereas salinity caused ionic imbalance more than drought stress. Single salinity and drought reduced shoot biomass equally, but salinity reduced root biomass more than drought. Plants experienced more oxidative stress under combined stress conditions because antioxidant levels did not increase in response to combined salinity-drought stress compared to individual salinity or drought stress. This study provided a comparative understanding of plants’ responses to individual and combined salinity and drought stress, and identified several research gaps. More comprehensive genetic and physiological studies are needed to understand the intricate interplay between salinity and drought in plants. Full article
(This article belongs to the Special Issue New Insights of Plants to Combined Stresses)
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