Oxidative Stress in Plants

Chaki, Mounira; Begara-Morales, Juan C.; Barroso, Juan B.

doi:10.3390/antiox9060481

Cited by 80 publications

(43 citation statements)

References 12 publications

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“…Drought stress inevitably results in oxidative damage due to the overproduction of ROS. ROS are the result of the partial reduction of atmospheric O 2 , such as superoxide radical (O 2 − ) and hydrogen peroxide (H 2 O 2 ), and possess oxidizing potential, with which unrestricted oxidation of the cellular components ultimately cause to cell death [ 31 ]. As inducing CCoAOMT1 transcription by treatment of MV, CCoAOMT1 null mutants exhibited less detoxification activity of MV-mediated ROS ( Figure 3 ), as well as higher H 2 O 2 accumulation in the leaves under drought stress conditions ( Figure 4 ).…”

Section: Discussionmentioning

confidence: 99%

Arabidopsis CCoAOMT1 Plays a Role in Drought Stress Response via ROS- and ABA-Dependent Manners

Chun

Lim

Cheong

et al. 2021

Plants

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Plants possess adaptive reprogramed modules to prolonged environmental stresses, including adjustment of metabolism and gene expression for physiological and morphological adaptation. CCoAOMT1 encodes a caffeoyl CoA O-methyltransferase and is known to play an important role in adaptation of Arabidopsis plants to prolonged saline stress. In this study, we showed that the CCoAOMT1 gene plays a role in drought stress response. Transcript of CCoAOMT1 was induced by salt, dehydration (drought), and methyl viologen (MV), and loss of function mutants of CCoAOMT1, ccoaomt1-1, and ccoaomt1-2 exhibit hypersensitive phenotypes to drought and MV stresses. The ccoaomt1 mutants accumulated higher level of H2O2 in the leaves and expressed lower levels of drought-responsive genes including RD29B, RD20, RD29A, and ERD1, as well as ABA3 3 and NCED3 encoding ABA biosynthesis enzymes during drought stress compared to wild-type plants. A seed germination assay of ccoaomt1 mutants in the presence of ABA also revealed that CCoAOMT1 functions in ABA response. Our data suggests that CCoAOMT1 plays a positive role in response to drought stress response by regulating H2O2 accumulation and ABA signaling.

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Section: Discussionmentioning

confidence: 99%

Arabidopsis CCoAOMT1 Plays a Role in Drought Stress Response via ROS- and ABA-Dependent Manners

Chun

Lim

Cheong

et al. 2021

Plants

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“…Stress leads to an increase in the ABA concentration, generating a cascade of signalling events via mitogen-activated protein kinase (MAPK) cascades, and calcium and calmodulin-dependent protein kinase, which interact with H 2 O 2 and nitric oxide (NO). Cross-talk between ROS and reactive nitrogen species (RNS) is associated by NO [ 187 ]. The ROS (H 2 O 2 ) enhances the activity of the nitrate reductase leading to generation of NO, and in this way, ROS and RNS are interconnected.…”

Section: Significance Of the Cross-talk Of The Antioxidants In Plant Biologymentioning

confidence: 99%

Recent Developments in Enzymatic Antioxidant Defence Mechanism in Plants with Special Reference to Abiotic Stress

Rajput

Harish

Singh

et al. 2021

Biology

432

151

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The stationary life of plants has led to the evolution of a complex gridded antioxidant defence system constituting numerous enzymatic components, playing a crucial role in overcoming various stress conditions. Mainly, these plant enzymes are superoxide dismutase (SOD), catalase (CAT), peroxidase (POX), glutathione peroxidase (GPX), glutathione reductase (GR), glutathione S-transferases (GST), ascorbate peroxidase (APX), monodehydroascorbate reductase (MDHAR), and dehydroascorbate reductase (DHAR), which work as part of the antioxidant defence system. These enzymes together form a complex set of mechanisms to minimise, buffer, and scavenge the reactive oxygen species (ROS) efficiently. The present review is aimed at articulating the current understanding of each of these enzymatic components, with special attention on the role of each enzyme in response to the various environmental, especially abiotic stresses, their molecular characterisation, and reaction mechanisms. The role of the enzymatic defence system for plant health and development, their significance, and cross-talk mechanisms are discussed in detail. Additionally, the application of antioxidant enzymes in developing stress-tolerant transgenic plants are also discussed.

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“…In addition, cell membrane instability and membrane injury provoked by oxidative stress is used as a basis to evaluate a plant's level of abiotic stress tolerance [57,58]. Higher activities of ROS scavenging enzymes protect plant cells from death caused by oxidative injury.…”

Section: Oxidative Stressmentioning

confidence: 99%

Down-Regulation of Cytokinin Receptor Gene SlHK2 Improves Plant Tolerance to Drought, Heat, and Combined Stresses in Tomato

Mushtaq

Wang

Fan

et al. 2022

Plants

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Environmental stresses negatively affect the growth and development of plants. Several previous studies have elucidated the response mechanisms of plants to drought and heat applied separately; however, these two abiotic stresses often coincide in environmental conditions. The global climate change pattern has projected that combined drought and heat stresses will tend to increase in the near future. In this study, we down-regulated the expression of a cytokinin receptor gene SlHK2 using RNAi and investigated the role of this gene in regulating plant responses to individual drought, heat, and combined stresses (drought + heat) in tomato. Compared to the wild-type (WT), SlHK2 RNAi plants exhibited fewer stress symptoms in response to individual and combined stress treatments. The enhanced abiotic stress tolerance of SlHK2 RNAi plants can be associated with increased membrane stability, osmoprotectant accumulation, and antioxidant enzyme activities. Furthermore, photosynthesis machinery was also protected in SlHK2 RNAi plants. Collectively, our results show that down-regulation of the cytokinin receptor gene SlHK2, and consequently cytokinin signaling, can improve plant tolerance to drought, heat, and combined stress.

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Oxidative Stress in Plants

Abstract: Environmental stresses negatively affect plant growth, development and crop productivity [...]

Cited by 80 publications

References 12 publications

Arabidopsis CCoAOMT1 Plays a Role in Drought Stress Response via ROS- and ABA-Dependent Manners

Arabidopsis CCoAOMT1 Plays a Role in Drought Stress Response via ROS- and ABA-Dependent Manners

Recent Developments in Enzymatic Antioxidant Defence Mechanism in Plants with Special Reference to Abiotic Stress

Down-Regulation of Cytokinin Receptor Gene SlHK2 Improves Plant Tolerance to Drought, Heat, and Combined Stresses in Tomato

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