The rice ALS3 encoding a novel pentatricopeptide repeat protein is required for chloroplast development and seedling growth

文献类型： 外文期刊

第一作者： Lin, Dongzhi

作者： Lin, Dongzhi;Gong, Xiaodi;Jiang, Quan;Zheng, Kailun;Zhou, Hua;Dong, Yanjun;Xu, Jianlong;Teng, Sheng

作者机构：

关键词： Albino;Chloroplast development;Lethality;Rice;Pentatricopeptide repeat (PPR) proteins

期刊名称：RICE （ 影响因子：4.783； 五年影响因子：5.23 ）

ISSN： 1939-8425

年卷期： 2015 年 8 卷

页码：

收录情况： SCI

摘要： Pentatricopeptide repeat (PPR) proteins play essential roles in modulating the expression of organelle genes and have expanded greatly in higher plants. However, molecular mechanisms of most rice PPR genes remain unclear. In this study, a new rice PPR mutant, asl3 (albino seedling lethality3) exhibits an albino lethal phenotype at the seedling stage. This albino phenotype was associated with altered photosynthetic-pigment and chloroplast development. Map-based cloning showed that ASL3 encodes a novel rice PPR protein with 10 tandem PPR motifs, which localizes to the chloroplast. ASL3 showed tissue-specific expression, as it was highly expressed in the chlorenchyma, but expressed at much lower levels in roots and panicles. RNAi of ASL3 confirmed that ASL3 plays an essential role in the early development and chloroplast development in rice. Moreover, expression analysis revealed that the asl3 mutation severely affected the transcriptional levels of important genes associated with plastid translation machinery and photosynthesis, which may impair photosynthesis and finally led to the seedling death in asl3 mutant. These results evidenced the important role of ASL3 in the early development of rice, especially chloroplast development. The ASL3 gene encoded a novel chloroplast-targeted PPR protein with 10 tandem PPR motifs in rice. Disruption of the ASL3 would lead to a defective chloroplast and seedling lethality, and affected expression levels of genes associated with chloroplast development and photosynthesis at early leaf stage of rice.

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