数字农科院2.0

OsSLC1 encodes a pentatricopeptide repeat protein essential for early chloroplast development and seedling survival

文献类型： 外文期刊

作者： Wu, Hong;Wang, Zhongwei;Shang, Lianguang;Xie, Shuzhang;Zhang, Yi;Yang, Ya'Nan;Yang, Xiaoyan;Wang, Zhongwei;Hai Phuong Trinh;Hu, Mingyu;Lv, Jun;Lei, Kairong;Chen, Yun;Bai, Wenqin;Han, Yao;Guo, Longbiao;Ge, Shengzhen

作者机构：

关键词： Oryza sativa; Chlorosis phenotype; PPR protein; Intron splicing; Chloroplast development

期刊名称： RICE

ISSN： 1939-8425

年卷期： 2020 年 13 卷 1 期

页码：

收录情况： JCR（2021版）

摘要： Background The large family of pentatricopeptide repeat (PPR) proteins is widely distributed among land plants. Such proteins play vital roles in intron splicing, RNA editing, RNA processing, RNA stability and RNA translation. However, only a small number of PPR genes have been identified in rice. Results In this study, we raised a mutant from tissue-culture-derived plants of Oryza sativa subsp. japonica 'Zhonghua 11', which exhibited a lethal chlorosis phenotype from germination to the third-leaf stage. The mutant was designated seedling-lethal chlorosis 1 (slc1). The slc1 mutant leaves showed extremely low contents of photosynthetic pigments and abnormal chloroplast development, and were severely defective in photosynthesis. Map-based cloning of OsSLC1 revealed that a single base (G) deletion was detected in the first exon of Os06g0710800 in the slc1 mutant, which caused a premature stop codon. Knockout and complementation experiments further confirmed that OsSLC1 is responsible for the seedling-lethal chlorosis phenotype in the slc1 mutant. OsSLC1 was preferentially expressed in green leaves, and encoded a chloroplast-localized PPR protein harboring 12 PPR motifs. Loss-of-function of OsSLC1 affected the intron splicing of multiple group II introns, and especially precluded the intron splicing of rps16, and resulted in significant increase in the transcript levels of 3 chloroplast ribosomal RNAs and 16 chloroplast development-related and photosynthesis-related genes, and in significant reduction in the transcript levels of 1 chloroplast ribosomal RNAs and 2 chloroplast development-related and photosynthesis-related genes. Conclusion We characterized a novel chloroplast-localized PPR protein, OsSLC1, which plays a vital role in the intron splicing of multiple group II introns, especially the rps16 intron, and is essential for early chloroplast development and seedling survival in rice.

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