文献类型： 外文期刊

作者： Zhang, Kexin ¹ ; Feng, Xia ¹ ; Liu, Ying ¹ ; Yang, Yajun ¹ ; Hao, Xinyuan ¹ ; Li, Dongliang ² ; Wang, Xinchao ¹ ; Wang, Lu ¹ ;

作者机构： 1.Chinese Acad Agr Sci, Minist Agr & Rural Affairs Peoples Republ China, Natl Ctr Tea Improvement, Key Lab Tea Biol & Resources Utilizat,Tea Res Inst, Hangzhou, Peoples R China

2.Hainan Acad Agr Sci, Sanya Inst, Sanya, Hainan, Peoples R China

期刊名称：PHYSIOLOGIA PLANTARUM （ 影响因子：6.4； 五年影响因子：5.9 ）

ISSN： 0031-9317

年卷期： 2023 年 175 卷 6 期

页码：

收录情况： SCI

摘要： Green tea made from albino buds and leaves has a strong umami taste and aroma. The cultivar 'Zhonghuang 2' (ZH2, Camellia sinensis) is a natural mutant with young shoots that are yellow in spring and green or yellow-green in summer. However, the mechanism of leaf color change remains unclear. Here, we found that young shoots of ZH2 were yellow at low temperature (LT) and green at high temperature (HT), indicating that ZH2 is a temperature-sensitive cultivar. Transmission electron microscopy analysis showed that the grana in the chloroplasts of young shoots grown at LT were poorly stacked, which caused a lack of photoreactions and chlorophyll. RNA-seq results showed 1279 genes differentially expressed in the young shoots grown at LT compared with those at HT, including genes related to cytochrome synthesis, chloroplast development, photosynthesis, and DNA methylation. A whole-genome bisulfite sequencing assay revealed that the dynamics of DNA methylation levels in the CG, CHG, and CHH contexts decreased under LT, and the change was most obvious in the CHH context. Furthermore, 72 genes showed significant changes in both expression and DNA methylation levels, and most of them were related to cytochrome synthesis, chloroplast development, photosynthesis, transcription factors, and signaling pathways. These results demonstrate that DNA methylation is involved in the LT-regulated albino processes of ZH2. Changes in DNA methylation levels were associated with changes in gene expression levels, affecting the structure and function of chloroplasts, which may have a phenotypic impact on shoot and leaf color.