Redox Signaling in Plant Heat Stress Response

Fortunato, Stefania; Lasorella, Cecilia; Dipierro, Nunzio; Vita, Federico; Pinto, Maria Concetta de

doi:10.3390/antiox12030605

Cited by 34 publications

(17 citation statements)

References 250 publications

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“…It displayed less variation in expression among heat-stressed groups. This observation raises the possibility that prolonged heat stress could produce excess ROS that exceeds cultivar’s capacities to maintain redox signaling (Fortunato et al, 2023). Nevertheless, cultivars 4775E3S, P46A86X, and R15-2422 demonstrated significant gene expression induction under drought, while DM45X61 only exhibited increased mRNA induction in response to combined heat and drought stresses.…”

Section: Discussionmentioning

confidence: 99%

Negative Synergistic Effects of Drought and Heat During Flowering and Seed Setting in Soybean

Poudel,

Vennam,

Sankarapillai

et al. 2024

Preprint

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Rising temperatures and intense heatwaves combined with lower precipitations are the new norms of current global scenarios. These altered climatic conditions negatively impact soybean yield potential and quality. Ten soybean cultivars were subjected to four different growing conditions: control, drought, heat, and combined heat and drought to understand the physiological, yield, and molecular changes. Stomatal conductance was reduced by 62% and 10% under drought and heat, respectively. This reduction was further exacerbated to 93% when exposed to both stresses simultaneously. The highest canopy temperature was recorded at +8 oC with combinatorial treatments, whereas heat and drought exhibited +5.4 oC and +2 oC, respectively. Furthermore, combined stress displayed a more pronounced negative impact on greenness-associated vegetative index; the gene expression analysis further corroborated these findings. Particularly, each oC increase in temperature during flowering-seed filling reduced seed weight by ~7% and ~4% with and without drought, respectively. The seed protein increased under drought, whereas the oil showed a converse trend under drought and combined stresses. Most physiology and yield traits showed no significant correlations between control or individual and combined stress. This suggests that selection for combinatorial stress may not be appropriate based on nonstress or individual stress performance. Thus, incorporating stress-resilient traits into elite soybean cultivars could significantly boost soybean production under hot and dry climatic conditions.

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Section: Discussionmentioning

confidence: 99%

Negative Synergistic Effects of Drought and Heat During Flowering and Seed Setting in Soybean

Poudel,

Vennam,

Sankarapillai

et al. 2024

Preprint

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“…The accumulation of these compounds significantly increases under As stress compared to control plants, which is consistent with previous research. 15 Furthermore, the application of SA and GABA leads to a notable increase in these antioxidant compounds, which may enhance their protective effect on plants. 87 …”

Section: Discussionmentioning

confidence: 99%

“… 12 , 14 Plant cells have efficient enzymatic and non-enzymatic antioxidant activity to counteract oxidative stress. 15 Other stress markers, such as H 2 O 2 levels, indicate the degree of damage and its prevention.…”

Section: Introductionmentioning

confidence: 99%

Salicylic Acid and Gemma-Aminobutyric Acid Mediated Regulation of Growth, Metabolites, Antioxidant Defense System and Nutrient Uptake in Sunflower (Helianthus annuus L.) Under Arsenic Stress

Nawaz,

Hussain,

Mahmood-ur-Rehman

et al. 2024

Dose-Response

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Background Arsenic (As) is a highly toxic and carcinogenic pollutant commonly found in soil and water, posing significant risks to human health and plant growth. Objective The objectives of this study to evaluate morphological, biochemical, and physiological markers, as well as ion homeostasis, to alleviate the toxic effects of As in sunflowers through the exogenous application of salicylic acid (SA), γ-aminobutyric acid (GABA), and their combination. Methods A pot experiment was conducted using two sunflower genotypes, FH-779 and FH-773, subjected to As stress (60 mg kg−1) to evaluate the effects of SA at 100 mg L−1, GABA at 200 mg L−1, and their combination on growth and related physiological and biochemical attributes under As stress. Results The study revealed that As toxicity had a detrimental effect on various growth parameters, chlorophyll pigments, relative water content, total proteins, and nutrient uptake in sunflower plants. It also led to increased oxidative stress, as indicated by higher levels of malondialdehyde (MDA) and hydrogen peroxide (H2O2), along with As accumulation in the roots and leaves. However, the application of SA and GABA protected against As-induced damage by enhancing the enzymatic antioxidant defense system. This was achieved through the activation of superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD) activities, as well as an increase in osmolytes. They also improved nutrient acquisition and plant growth under As toxicity. Conclusions We investigated the regulatory roles of SA and GABA in mitigating arsenic-induced phytotoxic effects on sunflower. Our results revealed a significant interaction between SA and GABA in regulating growth, photosynthesis, metabolites, antioxidant defense systems, and nutrient uptake in sunflower under As stress. These findings provide valuable insights into plant defense mechanisms and strategies to enhance stress tolerance in contaminated environments. In the future, SA and GABA could be valuable tools for managing stress in other important crops facing abiotic stress conditions.

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“…This in turn may cause an imbalance between dark and light reactions and excessive generation of ROS [ 7 ]. For example, with decreasing Calvin cycle activity, the consumption of NADP+ decreases, which in turn causes the formation of superoxide anion radicals (O 2 •) associated with incomplete oxidation of water (in PSII) or the oxidation of ferredoxin (in PSI) [ 47 , 48 ]. In S. sedoides , an imbalance in the stromal NADPH/NADP + ratio was indicated by a significant increase in malate valve activity (i.e., a four-fold increase in NADP-MDH activity, Figure 7 ).…”

Section: Discussionmentioning

confidence: 99%

Salinity Mitigates the Negative Effect of Elevated Temperatures on Photosynthesis in the C3-C4 Intermediate Species Sedobassia sedoides

Shuyskaya,

Rakhmankulova,

Prokofieva

et al. 2024

Plants

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The adaptation of plants to combined stresses requires unique responses capable of overcoming both the negative effects of each individual stress and their combination. Here, we studied the C3-C4 (C2) halophyte Sedobassia sedoides in response to elevated temperature (35 °C) and salinity (300 mM NaCl) as well as their combined effect. The responses we studied included changes in water–salt balance, light and dark photosynthetic reactions, the expression of photosynthetic genes, the activity of malate dehydrogenase complex enzymes, and the antioxidant system. Salt treatment led to altered water–salt balance, improved water use efficiency, and an increase in the abundance of key enzymes involved in intermediate C3-C4 photosynthesis (i.e., Rubisco and glycine decarboxylase). We also observed a possible increase in the activity of the C2 carbon-concentrating mechanism (CCM), which allowed plants to maintain high photosynthesis intensity and biomass accumulation. Elevated temperatures caused an imbalance in the dark and light reactions of photosynthesis, leading to stromal overreduction and the excessive generation of reactive oxygen species (ROS). In response, S. sedoides significantly activated a metabolic pathway for removing excess NADPH, the malate valve, which is catalyzed by NADP-MDH, without observable activation of the antioxidant system. The combined action of these two factors caused the activation of antioxidant defenses (i.e., increased activity of SOD and POX and upregulation of FDI), which led to a decrease in oxidative stress and helped restore the photosynthetic energy balance. Overall, improved PSII functioning and increased activity of PSI cyclic electron transport (CET) and C2 CCM led to an increase in the photosynthesis intensity of S. sedoides under the combined effect of salinity and elevated temperature relative to high temperature alone.

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Redox Signaling in Plant Heat Stress Response

Cited by 34 publications

References 250 publications

Negative Synergistic Effects of Drought and Heat During Flowering and Seed Setting in Soybean

Negative Synergistic Effects of Drought and Heat During Flowering and Seed Setting in Soybean

Salicylic Acid and Gemma-Aminobutyric Acid Mediated Regulation of Growth, Metabolites, Antioxidant Defense System and Nutrient Uptake in Sunflower (Helianthus annuus L.) Under Arsenic Stress

Salinity Mitigates the Negative Effect of Elevated Temperatures on Photosynthesis in the C3-C4 Intermediate Species Sedobassia sedoides

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