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GABA reverses salt-inhibited photosynthetic and growth responses through its influence on NO-mediated nitrogen-sulfur assimilation and antioxidant system in wheat
Journal of Biotechnology ( IF 4.1 ) Pub Date : 2020-11-12 , DOI: 10.1016/j.jbiotec.2020.11.015
Risheek Rahul Khanna 1 , Badar Jahan 2 , Noushina Iqbal 1 , Nafees A Khan 2 , Mohamed F AlAjmi 3 , Md Tabish Rehman 3 , M Iqbal R Khan 1
Affiliation  

Gamma-aminobutyric acid (GABA) is a recently recognized signaling molecule participating in physiological processes, growth, and development of plants under optimal and stressful environments. In the present reported research, we investigated the role of GABA in imparting salt stress tolerance in wheat (Triticum aestivum L.). Exposure of wheat plants to 100 mM NaCl resulted in increased oxidative stress, glucose content, nitric oxide (NO) production together with reduced growth and photosynthetic traits of plants. Contrarily, GABA supplementation improved nitrogen (N) metabolism, sulfur (S) assimilation, ion homeostasis, growth and photosynthesis under salt stress. Additionally, GABA mitigated oxidative stress induced by salt stress with the increased ascorbate-glutathione cycle and proline metabolism. The study with NO inhibitor, c-PTIO [2-(4-carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxy-3-oxide] in GABA experiment suggested that the impact of GABA on improvement of growth and photosynthesis under salt stress was mediated by NO, which influenced N and S assimilation and antioxidant systems. The results suggested that the GABA has a significant potential in reversing the salt stress response in wheat plants, and GABA-mediated signals are manifested through NO.



中文翻译:

GABA 通过影响 NO 介导的小麦氮硫同化和抗氧化系统来逆转盐抑制的光合和生长反应

γ-氨基丁酸 (GABA) 是最近公认的信号分子,参与植物在最佳和压力环境下的生理过程、生长和发育。在目前报道的研究中,我们研究了 GABA 在赋予小麦(Triticum aestivumL.)。小麦植物暴露于 100 mM NaCl 会导致氧化应激、葡萄糖含量、一氧化氮 (NO) 产量增加,同时植物的生长和光合特性降低。相反,GABA 补充剂改善了盐胁迫下的氮 (N) 代谢、硫 (S) 同化、离子稳态、生长和光合作用。此外,GABA 通过增加抗坏血酸-谷胱甘肽循环和脯氨酸代谢减轻盐胁迫诱导的氧化应激。在 GABA 实验中使用 NO 抑制剂 c-PTIO [2-(4-carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxy-3-oxide] 的研究表明,GABA 对促进生长和生长的影响盐胁迫下的光合作用是由 NO 介导的,它影响 N 和 S 的同化和抗氧化系统。

更新日期:2020-11-12
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