The newly identified heat-stress sensitive albino 1 gene affects chloroplast development in rice

文献类型： 外文期刊

第一作者： Qiu, Zhennan

作者： Qiu, Zhennan;Kang, Shujing;He, Lei;Zhao, Juan;Zhang, Sen;Hu, Jiang;Zeng, Dali;Zhang, Guangheng;Dong, Guojun;Gao, Zhenyu;Ren, Deyong;Chen, Guang;Guo, Longbiao;Qian, Qian;Zhu, Li

作者机构：

关键词： HSA1;Chloroplast development;Map-based cloning;Heat stress;Rice

期刊名称：PLANT SCIENCE （ 影响因子：4.729； 五年影响因子：5.132 ）

ISSN： 0168-9452

年卷期： 2018 年 267 卷

页码：

收录情况： SCI

摘要： High temperature, a major abiotic stress, significantly affects the yield and quality of crops in many parts of the world. Components of the photosynthetic apparatus are highly susceptible to thermal damage. Although the responses to acute heat stress have been studied intensively, the mechanisms that regulate chloroplast development under heat stress remain obscure, especially in crop plants. Here, we cloned and characterized the gene responsible for the heat-sensitive albinol (hsal) mutation in rice (Oryza sativa). The hsal mutant harbors a recessive mutation in a gene encoding fructokinase-like protein2 (FLN2); the mutation causes a premature stop codon and results in a severe albino phenotype, with defects in early chloroplast development. The color of hsal mutant plants gradually changed from albino to green at later stages of development at various temperatures and chloroplast biogenesis was strongly delayed at high temperature (32 degrees C). HSAI expression was strongly reduced in hsal plants compared to wild type (WT). HSA1 localizes to the chloroplast and regulates chloroplast development. An HSA1 deletion mutant induced by CRISPR/Cas9 was heat sensitive but had a faster greening phenotype than the original hsal allele at all temperatures. RNA and protein levels of plastid-encoded RNA polymerase-dependent plastid genes were markedly reduced in hsal plants compared to WT. These results demonstrated that HSA1 plays important roles in chloroplast development at early stages, and functions in protecting chloroplasts under heat stress at later stages in rice.

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