OsSIG2A is required for chloroplast development in rice (Oryza sativa L.) at low temperature by regulating plastid genes expression
文献类型： 外文期刊
作者： Yu, Yang 2 ; Zhou, Zhenling 1 ; Pu, Hanchun 1 ; Wang, Baoxiang 1 ; Zhang, Yunhui 2 ; Yang, Bo 1 ; Zhao, Tongli 1 ; Xu, Da 1 ;
作者机构： 1.Lianyungang Acad Agr Sci, Lianyungang 222234, Peoples R China
2.Jiangsu Acad Agr Sci, Inst Food Crops, Nanjing 210014, Peoples R China
关键词： chloroplast development; rice; RNA polymerase sigma factor; thermo-sensitive
期刊名称：FUNCTIONAL PLANT BIOLOGY （ 影响因子：3.101； 五年影响因子：3.248 ）
ISSN： 1445-4408
年卷期： 2019 年 46 卷 8 期
页码：
收录情况： SCI
摘要： The chloroplast is an essential photosynthetic apparatus that is more sensitive to low temperatures than other organelles. Sigma factors were revealed regulating specific gene expression for maintaining photosynthetic efficiency and adapting to physiological and environmental conditions. However, the regulatory mechanisms of SIG genes supporting chloroplast development under low temperature in rice have not yet been reported. Here, we uncovered the essential role of OsSIG2A in rice chloroplast development at low temperatures by a newly reported thermo-sensitive chlorophyll deficient 12 (tcd12) mutant, which exhibited albino leaves with decreased chlorophyll content and malformed chloroplasts at seedling stage under low temperature. OsSIG2A is a typical chloroplast-localised RNA polymerase sigma factor, and constitutively expresses in different rice tissues, especially for young leaves and stems. Moreover, the transcription level of both PEP- and NEP- dependent genes, which are necessary for chloroplast development at early leaf development stage, was greatly affected in the tcd12 mutant under low temperature. Taken together, our findings indicate that OsSIG2A is required for early chloroplast differentiation under low temperatures by regulating plastid genes expression.
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