The Stay-Green Rice like (SGRL) gene regulates chlorophyll degradation in rice |
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| Authors: | Hong Rong Yongyan Tang Hua Zhang Pingzhi Wu Yaping Chen Meiru Li Guojiang Wu Huawu Jiang |
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| Institution: | 1. Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China |
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| Abstract: | The Stay-Green Rice (SGR) protein is encoded by the SGR gene and has been shown to affect chlorophyll (Chl) degradation during natural and dark-induced leaf senescence. An SGR homologue, SGR-like (SGRL), has been detected in many plant species. We show that SGRL is primarily expressed in green tissues, and is significantly downregulated in rice leaves undergoing natural and dark-induced senescence. As the light intensity increases during the natural photoperiod, the intensity of SGRL expression declines while that of SGR expression increases. Overexpression of SGRL reduces the levels of Chl and Chl-binding proteins in leaves, and accelerates their degradation in dark-induced senescence leaves in rice. Our results suggest that the SGRL protein is also involved in Chl degradation. The relationship between SGRL and SGR and their effects on the degradation of the light-harvesting Chl a/b-binding protein are also discussed. |
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| Keywords: | Chl chlorophyll CCE Chl catabolic enzyme NYC1 non-yellow coloring1 NOL non-yellow coloring1 like MCS metal chelating substance PPH pheophytinase pFCC primary fluorescent chlorophyll catabolite PAO pheophorbide a oxygenase RCCR Chl catabolite reductase SGR Stay-Green Rice SGRL Stay-Green Rice like LHCP light-harvesting chlorophyll a/b-binding protein LHCI light-harvesting chlorophyll a/b-binding protein complex of photosystem I LHCII light-harvesting chlorophyll a/b-binding protein complex of photosystem II |
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