数字农科院2.0

Developmental changes in carbon and nitrogen metabolism affect tea quality in different leaf position

文献类型： 外文期刊

作者： Li, Zhi-Xin;Ahammed, Golam Jalal;Shen, Chen;Yan, Peng;Li, Xin;Han, Wen-Yan;Li, Zhi-Xin;Shen, Chen;Yang, Wei-Jun;Ahammed, Golam Jalal

作者机构：

关键词： Camellia sinensis;Leaf position;Photosynthesis;Respiration;Tea polyphenol;Amino acids;Caffeine

期刊名称： PLANT PHYSIOLOGY AND BIOCHEMISTRY

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Leaf position represents a specific developmental stage that influences both photosynthesis and respiration. However, the precise relationships between photosynthesis and respiration in different leaf position that affect tea quality are largely unknown. Here, we show that the effective quantum yield of photosystem II [Phi(PSll)] as well as total chlorophyll concentration (TChl) of tea leaves increased gradually with leaf maturity. Moreover, respiration rate (RR) together with total nitrogen concentration (TN) decreased persistently, but total carbon remained unchanged during leaf maturation. Analyses of major N-based organic compounds revealed that decrease in TN was attributed to a significant decrease in the concentration of caffeine and amino acids (AA) in mature leaves. Furthermore, soluble sugar (SS) decreased, but starch concentration increased with leaf maturity, indicating that source-sink relationship was altered during tea leaf development. Detailed correlation analysis showed that Phi(PSll) was negatively correlated with RR, SS, starch, tea polyphenol (TP), total catechins and TN, but positively correlated with TChl; while RR was positively correlated with TN, SS, TP and caffeine, but negatively correlated with TChl and starch concentrations. Our results suggest that biosynthesis of chlorophyll, catechins and poly phenols is closely associated with photosynthesis and respiration in different leaf position that greatly influences the relationship between primary and secondary metabolism in tea plants. (C) 2016 Elsevier Masson SAS. All rights reserved.

分类号： Q945`Q946

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