UMP kinase activity is involved in proper chloroplast development in rice

文献类型： 外文期刊

第一作者： Chen, Fei

作者： Chen, Fei;Ma, Xiaohui;Zhang, Yanli;Xiong, Erhui;Wu, Jiahuan;Wang, Huizhong;Wu, Limin;Yu, Yanchun;Dong, Guojun;Qian, Qian;Wang, Fang

作者机构：

关键词： Chloroplast development; Photosynthetic complexes; Rice (Oryza sativa L.); Thylakoid biogenesis; UMP kinase; Yellow leaf mutant

期刊名称：PHOTOSYNTHESIS RESEARCH （ 影响因子：3.573； 五年影响因子：3.674 ）

ISSN： 0166-8595

年卷期： 2018 年 137 卷 1 期

页码：

收录情况： SCI

摘要： Isolation of leaf-color mutants is important in understanding the mechanisms of chloroplast biogenesis and development. In this study, we identified and characterized a rice (Oryza sativa) mutant, yellow leaf 2 (yl2), exhibiting pale yellow leaves with a few longitudinal white stripes at the early seedling stage then gradually turning yellow. Genetic analyses revealed that YL2 encodes a thylakoid membrane-localized protein with significant sequence similarity to UMP kinase proteins in prokaryotes and eukaryotes. Prokaryotic UMP kinase activity was subsequently confirmed, with YL2 deficiency causing a significant reduction in chlorophyll accumulation and photochemical efficiency. Moreover, YL2 is also light dependent and preferentially expressed in green tissues. Chloroplast development was abnormal in the yl2 mutant, possibly due to reduced accumulation of thylakoid membranes and a lack of normal stroma lamellae. 2D Blue-Native SDS-PAGE and immunoblot analyses revealed a reduction in several subunits of photosynthetic complexes, in particular, the AtpB subunit of ATP synthase, while mRNA levels of corresponding genes were unchanged or increased compared with the wild type. In addition, we observed a significant decrease (ca. 36.3%) in cpATPase activity in the yl2 mutant compared with the wild type. Taken together, our results suggest that UMP kinase activity plays an essential role in chloroplast development and regulating cpATPase biogenesis in rice.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序