J Integr Plant Biol. ›› 2015, Vol. 57 ›› Issue (12): 1063-1077.DOI: 10.1111/jipb.12350

Special Issue: Rice Genomics and Agriculture

• Molecular Physiology • Previous Articles     Next Articles

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

Xiaolei Fan1, Jiemin Wu1, Taiyu Chen1, Weiwei Tie2, Hao Chen1, Fei Zhou1 and Yongjun Lin1*   

  1. 1National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research, Huazhong Agricultural University, Wuhan, China
    2Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou, China

Abstract:

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 H2O2 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.

 

Fan X, Wu J, Chen T, Tie W, Chen H, Zhou F, Lin Y (2015) Loss-of-function mutation of rice SLAC7 decreases chloroplast stability and induces a photoprotection mechanism in rice. J Integr Plant Biol 57: 1063–1077 doi: 10.1111/jipb.12350

Key words: Anion transport, chloroplast, cytokinin, Oryza sativa L, photoinhibition, SLAC1

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