Rice TSV3 Encoding Obg-Like GTPase Protein Is Essential for Chloroplast Development During the Early Leaf Stage Under Cold Stress

文献类型： 外文期刊

第一作者： Lin, Dongzhi

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

作者机构：

关键词： chloroplast development;ribosome biogenesis;rice (Oryza sativa L.);Spo0B GTP-binding protein (Obg);thermo-sensitive virescent

期刊名称：G3-GENES GENOMES GENETICS （ 影响因子：3.154； 五年影响因子：3.369 ）

ISSN： 2160-1836

年卷期： 2018 年 8 卷 1 期

页码：

收录情况： SCI

摘要： The Spo0B-associated GTP-binding (Obg) proteins are essential for the viability of nearly all bacteria. However, the detailed roles of Obg proteins in higher plants have not yet been elucidated. In this study, we identified a novel rice (Oryza sativa L.) thermo-sensitive virescent mutant (tsv3) that displayed an albino phenotype at 20 degrees before the three-leaf stage while being a normal green at 32 degrees or even at 20 degrees after the four-leaf stage. The mutant phenotype was consistent with altered chlorophyll content and chloroplast structure in leaves. Map-based cloning and complementation experiments showed that TSV3 encoded a small GTP-binding protein. Subcellular localization studies revealed that TSV3 was localized to the chloroplasts. Expression of TSV3 was high in leaves and weak or undetectable in other tissues, suggesting a tissue-specific expression of TSV3. In the tsv3 mutant, expression levels of genes associated with the biogenesis of the chloroplast ribosome 50S subunit were severely decreased at the three-leaf stage under cold stress (20 degrees), but could be recovered to normal levels at a higher temperature (32 degrees). These observations suggest that the rice nuclear-encoded TSV3 plays important roles in chloroplast development at the early leaf stage under cold stress.

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