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A single cytosine deletion in the OsPLS1 gene encoding vacuolar-type H+-ATPase subunit A1 leads to premature leaf senescence and seed dormancy in rice

文献类型： 外文期刊

作者： Yang, Xi 1 ; Gong, Pan 1 ; Li, Kunyu 1 ; Huang, Fudeng 2 ; Cheng, Fangmin 1 ; Pan, Gang 1 ;

作者机构： 1.Zhejiang Univ, Dept Agron, Zijingang Campus, Hangzhou 310058, Zhejiang, Peoples R China

2.Zhejiang Acad Agr Sci, Inst Crop & Nucl Technol Utilizat, Hangzhou 310021, Zhejiang, Peoples R China

关键词： Oryza sativa L;OsPLS1;premature leaf senescence;ROS;SA;seed dormancy;vacuolar-type H+-ATPase

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.992； 五年影响因子：7.86 ）

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收录情况： SCI

摘要： Leaf senescence is a programmed developmental process orchestrated by many factors, but its molecular regulation is not yet fully understood. In this study, a novel Oryza sativa premature leaf senescence mutant (ospls1) was examined. Despite normal development in early seedlings, the ospls1 mutant leaves displayed lesion-mimics and early senescence, and a high transpiration rate after tillering. The mutant also showed seed dormancy attributable to physical (defect of micropyle structure) and physiological (abscisic acid sensitivity) factors. Using a map-based cloning approach, we determined that a cytosine deletion in the OsPLS1 gene encoding vacuolar H+-ATPase subunit A1 (VHA-A1) underlies the phenotypic abnormalities in the ospls1 mutant. The OsPSL1/VHA-A1 transcript levels progressively declined with the age-dependent leaf senescence in both the ospls1 mutant and its wild type. The significant decrease in both OsPSL1/VHA-A1 gene expression and VHA enzyme activity in the ospls1 mutant strongly suggests a negative regulatory role for the normal OsPLS1/VHA-A1 gene in the onset of rice leaf senescence. The ospls1 mutant featured higher salicylic acid (SA) levels and reactive oxygen species (ROS) accumulation, and activation of signal transduction by up-regulation of WRKY genes in leaves. Consistent with this, the ospls1 mutant exhibited hypersensitivity to exogenous SA and/or H2O2. Collectively, these results indicated that the OsPSL1/VAH-A1 mutation played a causal role in premature leaf senescence through a combination of ROS and SA signals. To conclude, OsPLS1 is implicated in leaf senescence and seed dormancy in rice.

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[1]Transcriptome Analysis of a Progeny of Somatic Hybrids of Cultivated Rice (Oryza sativa L.) and Wild Rice (Oryza meyeriana L.) With High Resistance to Bacterial Blight. Wang, Xu-Ming,Zhou, Jie,Yang, Yong,Yu, Fei-Bo,Chen, Juan,Yu, Chu-Lang,Wang, Fang,Cheng, Ye,Yan, Cheng-Qi,Chen, Jian-Ping,Yu, Fei-Bo,Chen, Juan. 2013

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