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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. Loss‐of‐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 2 O 2  and abscisic acid levels were significantly higher in  slac7 ‐1 than in the wild type. Consistently, the photosynthesis efficiency 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  AtSLAC1  promoter could partially complement the phenotypes of  Arabidopsis   slac1  mutants, indicating a partial conservation of SLAC protein functions. These results suggest that SLAC7 is essential for maintaining the chloroplast stability in rice.

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