A DEAD-box RNA helicase TCD33 that confers chloroplast development in rice at seedling stage under cold stress

文献类型： 外文期刊

第一作者： Wang, Xiaomei

作者： Wang, Xiaomei;Kong, Rongrong;Zhang, Ting;Gao, Yuanyuan;Lin, Dongzhi;Dong, Yanjun;Xu, Jianlong;Piao, Zhongze;Lee, Gangseob;Dong, Yanjun

作者机构：

关键词： Chloroplast development; Cold stress; DEAD-box; RNA helicase; Map-based cloning; Rice

期刊名称：JOURNAL OF PLANT PHYSIOLOGY （ 影响因子：3.549； 五年影响因子：4.164 ）

ISSN： 0176-1617

年卷期： 2020 年 248 卷

页码：

收录情况： SCI

摘要： Cold stress is one of the most common unfavorable environmental factors affecting the growth, development, and survival of plants. The DEAD-box RNA helicases play important roles in all types of processes of RNA metabolism. However, the function of DEAD-box RNA helicase under cold stress is poorly explored in plants, especially in rice. This study reported the identification of a novel rice thermo-sensitive chlorophyll-deficient mutant, tcd33, which displayed an albino phenotype before the four-leaf stage, then withered and eventually died at 20 degrees C, while wild-type plants exhibited normal green coloration at 32 degrees C. The tcd33 seedlings also exhibited less chlorophyll contents and severe defects of chloroplast structure under 20 degrees C condition. Map-based cloning and complementation experiments suggested that TCD33 encodes a chloroplast-located DEAD-box RNA helicase protein. The transcript expression level of TCD33 indicated that the genes related to chlorophyll (Chl) biosynthesis, photosynthesis, and chloroplast development in tcd33 mutants were down-regulated at 20 degrees C, while the down-regulated genes were nearly recovered to or slightly higher than the WT level at 32 degrees C. Together, our results suggest that the cold-inducible TCD33 is essential for early chloroplast development and is important for cold-responsive gene regulation and cold tolerance in rice.

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