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The CsHSFA-CsJAZ6 module-mediated high temperature regulates flavonoid metabolism in Camellia sinensis

文献类型： 外文期刊

作者： Zhang, Xueying 1 ; Li, Linying 1 ; He, Yuqing 1 ; Lang, Zhuoliang 1 ; Zhao, Yao 1 ; Tao, Han 1 ; Li, Qingsheng 2 ; Hong, Gaojie 1 ;

作者机构： 1.Zhejiang Acad Agr Sci, Inst Virol & Biotechnol, State Key Lab Managing Biot & Chem Treats Qual & S, Key Lab Biotechnol Plant Protect MOA China & Zheji, Hangzhou, Peoples R China

2.Zhejiang Acad Agr Sci, Inst Sericulture & Tea, Hangzhou, Peoples R China

关键词： Camellia sinensis; catechin biosynthesis; CsJAZ6; heat shock factor (HSF); high temperatures (HT); JA; molecular regulation

期刊名称：PLANT CELL AND ENVIRONMENT （ 影响因子：7.3； 五年影响因子：8.1 ）

ISSN： 0140-7791

年卷期： 2023 年 46 卷 8 期

页码：

收录情况： SCI

摘要： High temperatures (HTs) seriously affect the yield and quality of tea. Catechins, derived from the flavonoid pathway, are characteristic compounds that contribute to the flavour of tea leaves. In this study, we first showed that the flavonoid content of tea leaves was significantly reduced under HT conditions via metabolic profiles; and then demonstrated that two transcription factors, CsHSFA1b and CsHSFA2 were activated by HT and negatively regulate flavonoid biosynthesis during HT treatment. Jasmonate (JA), a defensive hormone, plays a key role in plant adaption to environmental stress. However, little has been reported on its involvement in HT response in tea. Herein, we demonstrated that CsHSFA1b and CsHSFA2 activate CsJAZ6 expression through directly binding to heat shock elements in its promoter, and thereby repress the JA pathway. Most secondary metabolites are regulated by JA, including catechin in tea. Our study reported that CsJAZ6 directly interacts with CsEGL3 and CsTTG1 and thereby reduces catechin accumulation. From this, we proposed a CsHSFA-CsJAZ6-mediated HT regulation model of catechin biosynthesis. We also determined that negative regulation of the JA pathway by CsHSFAs and its homologues is conserved in Arabidopsis. These findings broaden the applicability of the regulation of JAZ by HSF transcription factors and further suggest the JA pathway as a valuable candidate for HT-resistant breeding and cultivation.

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