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Mechanism Underlying the Shading-Induced Chlorophyll Accumulation in Tea Leaves

文献类型： 外文期刊

作者： Chen, Jiaming 1 ; Wu, Shuhua 1 ; Dong, Fang 4 ; Li, Jianlong 5 ; Zeng, Lanting 1 ; Tang, Jinchi 5 ; Gu, Dachuan 1 ;

作者机构： 1.Chinese Acad Sci, South China Bot Garden, Guangdong Prov Key Lab Appl Bot, Guangzhou, Peoples R China

2.Chinese Acad Sci, South China Bot Garden, Key Lab South China Agr Plant Mol Anal & Genet Im, Guangzhou, Peoples R China

3.Univ Chinese Acad Sci, Coll Life Sci, Beijing, Peoples R China

4.Guangdong Food & Drug Vocat Coll, Guangzhou, Peoples R China

5.Guangdong Acad Agr Sci, Tea Res Inst, Lab Tea Plant Resources Innovat & Utilizat, Guangzhou, Peoples R China

6.Guangdong Prov Key, Guangzhou, Peoples R China

关键词： shading; light intensity; chlorophyll accumulation; Camellia sinensis; transcription regulation

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：6.627； 五年影响因子：7.255 ）

ISSN： 1664-462X

年卷期： 2021 年 12 卷

页码：

收录情况： SCI

摘要： Besides aroma and taste, the color of dry tea leaves, tea infusion, and infused tea leaves is also an important index for tea quality. Shading can significantly increase the chlorophyll content of tea leaves, leading to enhanced tea leaf coloration. However, the underlying regulatory mechanism remains unclear. In this study, we revealed that the expressions of chlorophyll synthesis genes were significantly induced by shading, specially, the gene encoding protochlorophyllide oxidoreductase (CsPOR). Indoor control experiment showed that decreased light intensity could significantly induce the expression of CsPOR, and thus cause the increase of chlorophyll content. Subsequently, we explored the light signaling pathway transcription factors regulating chlorophyll synthesis, including CsPIFs and CsHY5. Through expression level and subcellular localization analysis, we found that CsPIF3-2, CsPIF7-1, and CsHY5 may be candidate transcriptional regulators. Transcriptional activation experiments proved that CsHY5 inhibits CsPORL-2 transcription. In summary, we concluded that shading might promote the expression of CsPORL-2 by inhibiting the expression of CsHY5, leading to high accumulation of chlorophyll in tea leaves. The results of this study provide insights into the mechanism regulating the improvements to tea plant quality caused by shading.

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