Physiological Role of Gamma-Aminobutyric Acid in Salt Stress Tolerance

Jalil, Syed Uzma; Ansari, Mohammad Israil

doi:10.1007/978-3-030-40277-8_13

Cited by 26 publications

(20 citation statements)

References 73 publications

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“…Soil salinity has globally degraded nearly 20% of total arable and 33% of the irrigated land [ 57 ]. Excess sodium (Na + ) and chloride (Cl − ) ions present in the saline soil are transported and accumulated to the toxic level at the expense of other essential ions in plant cells [ 36 ]. Salt stress plants desisting water absorption experience drought-like conditions [ 36 ].…”

Section: Climate Change Triggers Abiotic Stress and Ros Generationmentioning

confidence: 99%

“…Excess sodium (Na + ) and chloride (Cl − ) ions present in the saline soil are transported and accumulated to the toxic level at the expense of other essential ions in plant cells [ 36 ]. Salt stress plants desisting water absorption experience drought-like conditions [ 36 ]. Therefore, salinity reduces stomatal conductance and disrupts photosystem (PS) and photosynthetic enzymes that lead to ROS production in plants [ 57 ].…”

Section: Climate Change Triggers Abiotic Stress and Ros Generationmentioning

confidence: 99%

“…The gamma-aminobutyric acid (GABA) is a ubiquitous non-protein amino acid that accumulates in plant cells under stress conditions and provides tolerance by scavenging free radicals and regulating the enzyme activity [ 36 , 200 ]. GABA acts as an osmolyte or encourages the production of other osmolytes such as proline under conditions such as the drought that aids in osmotic adjustment for acclimatization during stress [ 36 ]. GABA is metabolized by a GABA shunt pathway that comprises GABA transaminase (GABA-T), glutamate dehydrogenase (GDH), and succinic semialdehyde dehydrogenase [ 200 ].…”

Section: Antioxidants: Oxidative Stress Defense Mechanismmentioning

confidence: 99%

“…Jalil et al [ 41 ] have reported that the mutant of A. thaliana lacking the GABA-T gene reduces GABA and chlorophyll content, lowers photosynthesis, and GDH activity but increases membrane ion leakage, MDA content, and early leaf senescence under various abiotic stresses. GABA also participates in the signal transduction pathway under stress via the increased cytosolic calmodulin-dependent activity of the enzyme glutamate decarboxylase [ 36 ].…”

Section: Antioxidants: Oxidative Stress Defense Mechanismmentioning

confidence: 99%

“…Reduced seed germination, immature leaf senescence, and abridged growth and productivity. [7,35,36] Antioxidants 2021, 10, 277 6 of 37…”

mentioning

confidence: 99%

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Abiotic Stress and Reactive Oxygen Species: Generation, Signaling, and Defense Mechanisms

et al. 2021

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Climate change is an invisible, silent killer with calamitous effects on living organisms. As the sessile organism, plants experience a diverse array of abiotic stresses during ontogenesis. The relentless climatic changes amplify the intensity and duration of stresses, making plants dwindle to survive. Plants convert 1–2% of consumed oxygen into reactive oxygen species (ROS), in particular, singlet oxygen (1O2), superoxide radical (O2•–), hydrogen peroxide (H2O2), hydroxyl radical (•OH), etc. as a byproduct of aerobic metabolism in different cell organelles such as chloroplast, mitochondria, etc. The regulatory network comprising enzymatic and non-enzymatic antioxidant systems tends to keep the magnitude of ROS within plant cells to a non-damaging level. However, under stress conditions, the production rate of ROS increases exponentially, exceeding the potential of antioxidant scavengers instigating oxidative burst, which affects biomolecules and disturbs cellular redox homeostasis. ROS are similar to a double-edged sword; and, when present below the threshold level, mediate redox signaling pathways that actuate plant growth, development, and acclimatization against stresses. The production of ROS in plant cells displays both detrimental and beneficial effects. However, exact pathways of ROS mediated stress alleviation are yet to be fully elucidated. Therefore, the review deposits information about the status of known sites of production, signaling mechanisms/pathways, effects, and management of ROS within plant cells under stress. In addition, the role played by advancement in modern techniques such as molecular priming, systems biology, phenomics, and crop modeling in preventing oxidative stress, as well as diverting ROS into signaling pathways has been canvassed.

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Section: Climate Change Triggers Abiotic Stress and Ros Generationmentioning

confidence: 99%