Effects of sunlight on gene expression and chemical composition of light-sensitive albino tea plant

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• 作者：Nana Li ; Yaping Yang ; Jianhui Ye ; Jianliang Lu ; Xinqiang Zheng…
• 关键词：Gene expression ; Sunshade ; Chloroplast ; Chlorophyll ; Violaxanthin ; Lutein
• 刊名：Plant Growth Regulation
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：78
• 期：2
• 页码：253-262
• 全文大小：1,105 KB
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• 作者单位：Nana Li (1)
  Yaping Yang (1)
  Jianhui Ye (1)
  Jianliang Lu (1)
  Xinqiang Zheng (1)
  Yuerong Liang (1)
  
  1. Department of Tea Science, Zhejiang University, #866, Yuhangtang Road, Hangzhou, 310058, People’s Republic of China
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Physiology
  
• 出版者：Springer Netherlands
• ISSN：1573-5087

文摘

Light-sensitive albino tea plant grows yellow shoots under strong sunlight conditions. The yellow albino shoots contain high level of amino acids and medium level of polyphenols, which is beneficial for sensory quality of green tea. The effects of sunlight intensity on the transcriptions of genes involved in biosynthesis of chlorophylls and carotenoids, as well as the ultrastructure of chloroplasts, were investigated using a light-sensitive albino tea cultivar ‘Huangjinya’, and compared with a normal tea cultivar ‘Fudingdabai’. The results showed that strong sunlight induced hypoplasia of chloroplasts by suppressing the development of grana stacking and thylakoids, and down-regulated the expression levels of the 1-deoxy-d-xylulose-5-phosphate synthase gene family, involved in biosynthesis of precursors of carotenoids and chlorophylls, as well as the magnesium chelatase subunit D gene, involved in biosynthesis of chlorophylls, leading to the reduction of chlorophylls. Strong sunlight up-regulated the expression of genes involved in carotenoid pathway, resulting in the accumulation of carotenoids, including violaxanthin and lutein. The shortage of chlorophylls and the accumulation of carotenoids were considered to cause the yellow color of the albino shoots of the light-sensitive albino tea cultivar ‘Huangjinya’.