Osmotically stress-regulated the expression of glutathione peroxidase 3 in Arabidopsis

Numan

et al. 2020

Plants

157

Melatonin is a multifunctional signaling molecule that is ubiquitously distributed in different parts of a plant and responsible for stimulating several physio-chemical responses to adverse environmental conditions. In this review, we show that, although plants are able to biosynthesize melatonin, the exogenous application of melatonin to various crops can improve plant growth and development in response to various abiotic and biotic stresses (e.g., drought, unfavorable temperatures, high salinity, heavy metal contamination, acid rain, and combined stresses) by regulating antioxidant machinery of plants. Current knowledge suggests that exogenously applied melatonin can enhance the stress tolerance of plants by regulating both the enzymatic and non-enzymatic antioxidant defense systems. Enzymic antioxidants upregulated by exogenous melatonin include superoxide dismutase, catalase, glutathione peroxidase, and enzymes involved in the ascorbate–glutathione cycle (ascorbate peroxidase, monodehydroascorbate reductase, dehydroascorbate reductase, and glutathione reductase), whereas levels of non-enzymatic antioxidants such as ascorbate, reduced glutathione, carotenoids, tocopherols, and phenolics are also higher under stress conditions. The enhanced antioxidant system consequently exhibits lower lipid peroxidation and greater plasma membrane integrity when under stress. However, these responses vary greatly from crop to crop and depend on the intensity and type of stress, and most studies to date have been conducted under controlled conditions. This means that a wider range of crop field trials and detailed transcriptomic analysis are required to reveal the gene regulatory networks involved in the between melatonin, antioxidants, and abiotic stress.

Section: Glutathione Peroxidase (Gpx)mentioning

confidence: 99%

Melatonin: Awakening the Defense Mechanisms during Plant Oxidative Stress

Numan

et al. 2020

Plants

157

“…, ; Miao et al . ). The same phenomenon was also observed in Salvia miltiorrhiza (Han ), perennial ryegrass ( Lolium perenne L.) (Hu et al .…”

Section: Discussionmentioning

confidence: 97%

“…; Miao et al . ). GPx mRNA also increased in the tissues of several plant species undergoing stress including salt stress in suspension cells, cold stress, light stress and heavy metal poisoning (Avsian‐Kretchmer et al .…”

Section: Introductionmentioning

confidence: 97%

“…; Miao et al . ). The expression of GPx3 in Arabidopsis was upregulated by osmotic stress (Miao et al .…”

Section: Introductionmentioning

confidence: 97%

“…The expression of GPx3 in Arabidopsis was upregulated by osmotic stress (Miao et al . ) and the salt‐stress signal transduction pathway could activate the gpx1 promoter and enhance its expression by intracellular H 2 O 2 (Avsian‐Kretchmer et al . ).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Molecular cloning of glutathione peroxidase gene of Antarctic ice microalga Chlamydomonas sp. ICE‐L and its expression changes under temperature and salinity stress

Wang

Ding

Tang

et al. 2018

Phycological Research

A complete open reading frame (ORF) encoding a glutathione peroxidase (ICE-LGPx) was determined from Antarctic Chlamydomonas sp. ICE-L by the molecular biological methods. The transcriptional expression patterns of ICE-LGPx under different salinity and temperature stresses were determined by the real-time polymerase chain reaction, and the activities of ICE-LGPx were assayed under salinity stress as well. The fulllength cDNA sequence of ICE-LGPx mRNA was 1956 bp including an ORF of 765 bp. Molecular structure analysis revealed that ICE-LGPx was a selenium-dependent glutathione peroxidase (Se-GPx) containing a form-2 SECIS (SelenoCysteine Insertion Sequence) element. Phylogenetic analysis showed that ICE-LGPx displayed parallel evolution with those of Volvox carteri, Chlorella variabilis, Micromonas sp. RCC299 and Micromonas pusilla. The expression analysis results indicated that transcription of ICE-LGPx was induced by the changes of the salinity and temperature. The change tendency of enzyme activities was similar to that of ICE-LGPx mRNA level. Time-and dose-dependent effects were observed in the salinity treatments and time-dependent effects were found in the temperature treatments as well. These results suggested that ICE-LGPx might play an important role in the acclimatization of Chlamydomonas sp. ICE-L to salt and low temperature stresses. Furthermore, the results of this investigation may help to clarify the acclimatization and stress response mechanisms of Antarctic ice alga.

Glutathione in Plant Growth, Development, and Stress Tolerance

Plant Glutathione Peroxidases: Antioxidant Enzymes in Plant Stress Responses and Tolerance

Bela

Bangash

Riyazuddin

et al. 2017

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