Exogenous gamma-aminobutyric acid (GABA) improves salt-inhibited nitrogen metabolism and the anaplerotic reaction of the tricarboxylic acid cycle by regulating GABA-shunt metabolism in maize seedlings

文献类型： 外文期刊

第一作者： Wang, Yongchao

作者： Wang, Yongchao;Cao, Hongzhang;Wang, Shancong;Guo, Jiameng;Dou, Hangyu;Yang, Qinghua;Shao, Ruixin;Wang, Hao;Wang, Yongchao;Guo, Jiameng;Yang, Qinghua;Shao, Ruixin;Wang, Hao;Qiao, Jiangfang

作者机构：

关键词： gamma-Aminobutyric acid; Maize; Nitrogen metabolism; Tricarboxylic acid cycle; Oxidative damage; Salt tolerance

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：6.8； 五年影响因子：6.9 ）

ISSN： 0147-6513

年卷期： 2023 年 254 卷

页码：

收录情况： SCI

摘要： Salinity stress hampers the growth of most crop plants and reduces yield considerably. In addition to its role in metabolism, gamma-aminobutyric acid (GABA) plays a special role in the regulation of salinity stress tolerance in plants, though the underlying physiological mechanism remains poorly understood. In order to study the physiological mechanism of GABA pathway regulated carbon and nitrogen metabolism and tis relationship with salt resistance of maize seedlings, we supplemented seedlings with exogenous GABA under salt stress. In this study, we showed that supplementation with 0.5 mmol.L-1 (0.052 mg.g(-1)) GABA alleviated salt toxicity in maize seedling leaves, ameliorated salt-induced oxidative stress, and increased antioxidant enzyme activity. Applying exogenous GABA maintained chloroplast structure and relieved chlorophyll degradation, thus improving the photosynthetic performance of the leaves. Due to the improvement in photosynthesis, sugar accumulation also increased. Endogenous GABA content and GABA transaminase (GABA-T) and succinate semialdehyde dehydrogenase (SSADH) activity were increased, while glutamate decarboxylase (GAD) activity was decreased, via the exogenous application of GABA under salt stress. Meanwhile, nitrogen metabolism and the tricarboxylic acid (TCA) cycle were activated by the supply of GABA. In general, through the regulation of GABA-shunt metabolism, GABA activated enzymes related to nitrogen metabolism and replenished the key substrates of the TCA cycle, thereby improving the balance of carbon and nitrogen metabolism of maize and improving salt tolerance.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序