Effects of GABA on the polyphenol accumulation and antioxidant activities in tea plants (Camellia sinensis L.) under heat-stress conditions
文献类型： 外文期刊
作者： Ren, Taiyu 1 ; Zheng, Pengcheng 2 ; Zhang, Kexin 1 ; Liao, Jieren 1 ; Xiong, Fei 1 ; Shen, Qiang 3 ; Ma, Yuanchun 1 ; Fan 1 ;
作者机构： 1.Nanjing Agr Univ, Coll Hort, Nanjing 210095, Peoples R China
2.Hubei Acad Agr Sci, Inst Fruit & Tea, Wuhan 430064, Peoples R China
3.Guizhou Prov Acad Agr Sci, Inst Tea Sci, Guiyang 417100, Peoples R China
关键词： Camellia sinensis; Heat stress; GABA; Polyphenols; Antioxidant system; Gene expression
期刊名称：PLANT PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：4.27； 五年影响因子：4.816 ）
ISSN： 0981-9428
年卷期： 2021 年 159 卷
页码：
收录情况： SCI
摘要： Polyphenols are important active components in tea plants, which have strong biological activity and antioxidant activity. A certain degree of stress or exogenous substances can significantly increase the content of polyphenols in plants. gamma-Aminobutyric acid (GABA), a natural functional amino acid, was used to study whether exogenous GABA can increase the content of polyphenols and enhance antioxidant activity in tea plants under heat-stress conditions. The results showed that the content of GABA was positively correlated with the content of polyphenols (r = 0.649), especially with the content of total catechins (r = 0.837). Most of the related genes encoding flavonoid metabolism (PAL, C4H, 4CL, CHS, CHI, F3H, F3'H, F3' H, DFR, LAR, ANS, ANR and FLS) as well as enzyme activities (PAL, C4H and 4CL) were upregulated. In addition, the activities of antioxidant enzymes were induced under heat-stress conditions. However, 3-mercaptopropionic acid (3-MPA), an inhibitor of GABA synthesis, exhibited opposite results under heat-stress conditions compared with GABA treatment. These results indicated that GABA plays a key role in the accumulation of polyphenols and the upregulation of the antioxidant system in tea plants under heat-stress conditions.
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