Genome-wide epigenetic dynamics of tea leaves under mechanical wounding stress during oolong tea postharvest processing

文献类型： 外文期刊

第一作者： Zheng, Yucheng

作者： Zheng, Yucheng;Zhang, Bo;Zheng, Yucheng;Ou, Xiaoxi;Li, Qiuming;Wu, Zongjie;Wu, Liangyu;Sun, Yun;Li, Xinlei

作者机构：

关键词： Camellia sinensis; DNA methylation; Chromatin accessibility; Oolong tea; Postharvest processing; CsMYC2

期刊名称：FOOD RESEARCH INTERNATIONAL （ 影响因子：7.0； 五年影响因子：7.4 ）

ISSN： 0963-9969

年卷期： 2024 年 194 卷

页码：

收录情况： SCI

摘要： Understanding the epigenetic responses to mechanical wounding stress during the postharvest processing of oolong tea provides insight into the reprogramming of the tea genome and its impact on tea quality. Here, we characterized the 5mC DNA methylation and chromatin accessibility landscapes of tea leaves subjected to mechanical wounding stress during the postharvest processing of oolong tea. Analysis of the differentially methylated regions and preferentially accessible promoters revealed many overrepresented TF-binding motifs, highlighting sets of TFs that are likely important for the quality of oolong tea. Within these sets, we constructed a chromatin accessibility-mediated gene regulatory network specific to mechanical wounding stress. In combination with the results of the TF-centred yeast one-hybrid assay, we identified potential binding sites of CsMYC2 and constructed a gene regulatory network centred on CsMYC2, clarifying the potential regulatory role of CsMYC2 in the postharvest processing of oolong tea. Interestingly, highly accessible chromatin and hypomethylated cytosine were found to coexist in the promoter region of the indole biosynthesis gene (tryptophan synthase beta-subunit, CsTSB) under wounding stress, which indicates that these two important epigenetic regulatory mechanisms are jointly involved in regulating the synthesis of indole during the postharvest processing of oolong tea. These findings improve our understanding of the epigenetic regulatory mechanisms involved in quality formation during the postharvest processing of oolong tea.

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