Loss-of-function mutation of rice SLAC7 decreases chloroplast stability and induces a photoprotection mechanism in rice

查看全文 作　　者：Xiaolei [1]Fan;Jiemin [1]Wu;Taiyu [1]Chen;Weiwei [2]Tie;Hao [1]Chen;Fei [1]Zhou;Yongjun [1]Lin

机构地区：[1]National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research, Huazhong Agricultural University;[2]Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences

出　　处：《Journal of Integrative Plant Biology》索引2015年第57卷第12期,共15页

基　　金：funded by the National High Technology Research and Development Program of China (863 Program);the National Program of Transgenic Variety Development of China;the National Natural Science Foundation of China 摘　　要：Plants absorb sunlight to power the photochemical reactions of photosynthesis, which can potentially damage the photosynthetic machinery. However, the mechanism that protects chloroplasts from the damage remains unclear. In this work, we demonstrated that rice(Oryza sativa L.) SLAC7 is a generally expressed membrane protein. Lossof-function of SLAC7 caused continuous damage to the chloroplasts of mutant leaves under normal light conditions.Ion leakage indicators related to leaf damage such as H_2O_2 and abscisic acid levels were significantly higher in slac7-1 than in the wild type. Consistently, the photosynthesis ef ficiency and Fv/Fm ratio of slac7-1 were significantly decreased(similar to photoinhibition). In response to chloroplast damage, slac7-1 altered its leaf morphology(curled or fused leaf) by the synergy between plant hormones and transcriptional factors to decrease the absorption of light, suggesting that a photoprotection mechanism for chloroplast damage was activated in slac7-1. When grown in dark conditions, slac7-1 displayed a normal phenotype. SLAC7 under the control of the At SLAC1 promoter could partially complement the phenotypes of Arabidopsis slac1 mutants, indicating a partia conservation of SLAC protein functions. These results suggest that SLAC7 is essential for maintaining the chloroplast stability in rice. 关键词：防御机制叶绿体突变体稳定性水稻连续损伤诱导光合作用

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Loss-of-function mutation of rice SLAC7 decreases chloroplast stability and induces a photoprotection mechanism in rice

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