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Effects of GABA on the polyphenol accumulation and antioxidant activities in tea plants (Camellia sinensis L.) under heat-stress conditions.
Ren, Taiyu; Zheng, Pengcheng; Zhang, Kexin; Liao, Jieren; Xiong, Fei; Shen, Qiang; Ma, Yuanchun; Fang, Wanping; Zhu, Xujun.
Afiliación
  • Ren T; College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China.
  • Zheng P; Institute of Fruit and Tea, Hubei Academy of Agricultural Sciences, Wuhan, 430064, China.
  • Zhang K; College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China.
  • Liao J; College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China.
  • Xiong F; College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China.
  • Shen Q; Institute of Tea Sciences, Guizhou Provincial Academy of Agricultural Sciences, Guiyang, 417100, China.
  • Ma Y; College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China.
  • Fang W; College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China.
  • Zhu X; College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China. Electronic address: zhuxujun@njau.edu.cn.
Plant Physiol Biochem ; 159: 363-371, 2021 Feb.
Article en En | MEDLINE | ID: mdl-33434784
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. γ-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, F3'5'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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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Camellia sinensis / Polifenoles / Ácido gamma-Aminobutírico / Calor Idioma: En Revista: Plant Physiol Biochem Asunto de la revista: BIOQUIMICA / BOTANICA Año: 2021 Tipo del documento: Article País de afiliación: China Pais de publicación: Francia
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Camellia sinensis / Polifenoles / Ácido gamma-Aminobutírico / Calor Idioma: En Revista: Plant Physiol Biochem Asunto de la revista: BIOQUIMICA / BOTANICA Año: 2021 Tipo del documento: Article País de afiliación: China Pais de publicación: Francia