Abstract
‘Huangjinya’ (HJY) is a light-sensitive chlorotic tea cultivar (Camellia sinensis L.) that grows chlorotic shoots under sun-light conditions but its chlorotic shoots turn green under weak light conditions. However, the mechanisms responsible for light intensity-induced changes in leaf color remain unclear. In this study, we compared HJY plants with chlorotic leaves exposed to sun-light (Y) and HJY plants with green leaves exposed to both sun and shade (Y + S) on the basis of metabolite profiles, expression of proteins and genes in the pigment metabolic pathway and photosynthetic system. We found that the main hindered sites in chlorophyll synthesis pathway of Y were from COPP III to PP IX and the down-regulation of POR and CAO further inhibited the synthesis of chlorophyll a and b. In addition, the gene and protein expression of ACD1, the key site of chlorophyll degradation, was significantly up-regulated in Y, indicating that sunlight also enhanced the degradation of chlorophyll in HJY. The contents of antenna protein, PSII and PSI-related protein in Y were significantly decreased, and photosynthetic electron transport was blocked, resulting in a significant decrease in photosynthetic efficiency of HJY.
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