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gamma-Aminobutyric acid (GABA) improves pesticide detoxification in plants

文献类型： 外文期刊

作者： Shan, Qing 1 ; Liu, Minghui 1 ; Li, Rui 3 ; Shi, Qinghua 1 ; Li, Yan 2 ; Gong, Biao 1 ;

作者机构： 1.Shandong Agr Univ, Minist Agr, State Key Lab Crop Biol, Key Lab Hort Crop Biol & Germplasm Innovat,Coll H, Tai An 271018, Shandong, Peoples R China

2.Shandong Acad Agr Sci, Jinan 250100, Peoples R China

3.China Agr Univ, Coll Food Sci & Nutr Engn, Beijing 100083, Peoples R China

关键词： gamma-Aminobutyric acid; Pesticide detoxification; Pyruvate-dependent GABA transaminase; Tomato

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：10.753； 五年影响因子：10.237 ）

ISSN： 0048-9697

年卷期： 2022 年 835 卷

页码：

收录情况： SCI

摘要： It is important to ensure food safety to study the technology and mechanism of pesticide residues degradation in crops. Though gamma-aminobutyric acid (GABA) has been widely reported to involve in plant stress resistance, whether exogenous application or endogenous regulation of GABA by gene-editing technology can promote the pesticide detoxification is not clear in plants. Using tomato and chlorothalonil (CHT) as research models, we discovered that exogenous application of GABA or endogenous elevation of GABA by knockout of pyruvate-dependent GABA transaminase promoted both CHT metabolism and plant stress tolerance to CHT. This is closely related to the active adaptation of GABA to CHT stress by regulating the plant GABA shunt pathway and polyamine pathway. The transcriptome data revealed 17 target genes that may be closely related to the involvement of GABA in CHT metabolism, including 4 peroxidases, 5 glycosyltransferases, 4 glutathione S-transferases, and 4 ABC transporters. In addition, the glutathione detoxification pathway and antioxidative enzyme also actively participated in the GABA-induced CUT detoxification process, which played an important role in relieving CHT stress. As a result, GABA significantly increased the photosynthetic capacity of tomato leaves under CHT stress. While studying photosynthesis, we unexpectedly found that GABA promotes stomatal closure in terms of decreased stomatal conductance and stomatal diameter. This result implies that GABA can reduce an absorption by regulating stomatal movement in leaves. Together, we provided a novel viewpoint that foliar application of GABA or metabolic engineering of GABA is an effective approach to reduce the risk of pesticide contamination in crop production.

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