Light-hormone interaction in the red-light-induced suppression of photomorphogenesis in rice seedlings

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• 作者：Ansuman Roy ; Dinabandhu Sahoo ; Baishnab C. Tripathy
• 关键词：Chlorophyll biosynthesis ; Cytokinin ; Photomorphogenesis ; Plant development ; Red light ; Rice
• 刊名：Protoplasma
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：253
• 期：2
• 页码：393-402
• 全文大小：791 KB
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• 作者单位：Ansuman Roy (1)
  Dinabandhu Sahoo (2)
  Baishnab C. Tripathy (1)
  
  1. School of Life Sciences, Jawaharlal Nehru University, New Delhi, 110067, India
  2. Department of Botany, University of Delhi, New Delhi, India
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Cell Biology
  Plant Sciences
  Zoology
  
• 出版者：Springer Wien
• ISSN：1615-6102

文摘

Red light perceived by the shoot bottom suppresses photomorphogenesis in rice seedlings mediated by phytochrome A. Shoots of these seedlings grown in red light having their shoot bottom exposed were deficient in chlorophyll and accumulated high concentration of trans-zeatin riboside. However, reduced presence of isopentynyl adenosine, dihydrozeatin riboside was observed in shoots of red-light-grown non-green seedlings in comparison to green seedling. The message abundance of cytokinin receptor (OsHK5), transporters (OsENT1, OsENT2), and response regulators (OsRR4, OsRR10) was downregulated in these red-light-grown non-green seedlings. Attenuation of greening process was reversed by application of exogenous cytokinin analogue, benzyladenine, or supplementing red light with blue light. In the same vein, the suppression of gene expression of cytokinin receptor, transporters, and type-A response regulators was reversed in red-light-grown seedlings treated with benzyladenine suggesting that the disarrayed cytokinin (CK) signaling cascade is responsible for non-greening of seedlings grown in red light. The reversal of red-light-induced suppression of photomorphogenesis by blue light and benzyladenine demonstrates the interaction of light and cytokinin signaling cascades in the regulation of photomorphogenesis. Partial reversal of greening process by exogenous application of benzyladenine suggests, apart from CKs perception, transportation and responsiveness, other factors are also involved in modulation of suppression of photomorphogenesis by red light.