Purine nucleotide biosynthetic gene GARS controls early chloroplast development in rice (Oryza sativa L.)

文献类型： 外文期刊

第一作者： Cao, Penghui

作者： Cao, Penghui;Ren, Yakun;Liu, Xi;Zhang, Tianyu;Zhang, Ping;Xiao, Lianjie;Zhang, Fulin;Liu, Shijia;Jiang, Ling;Wan, Jianmin;Wan, Jianmin

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关键词： Rice (Oryza sativa L.); Purine nucleotide biosynthesis; Chloroplast development; GARS

期刊名称：PLANT CELL REPORTS （ 影响因子：4.57； 五年影响因子：4.463 ）

ISSN： 0721-7714

年卷期： 2019 年 38 卷 2 期

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收录情况： SCI

摘要： Key messageGARS encodes an enzyme catalyzing the second step of purine nucleotide biosynthesis and plays an important role to maintain the development of chloroplasts in juvenile plants by affecting the expression of plastid-encoded genes.AbstractA series of rice white striped mutants were previously described. In this research, we characterized a novel gars mutant with white striped leaves at the seedling stage. By positional cloning, we identified the mutated gene, which encodes a glycinamide ribonucleotide synthetase (GARS) that catalyzes the second step of purine nucleotide biosynthesis. Thylakoid membranes were less abundant in the albinic sectors of mutant seedling leaves compared to the wild type. The expression levels of genes involved in chlorophyll synthesis and photosynthesis were changed. Contents of ATP, ADP, AMP, GTP and GDP, which are crucial for plant growth and development, were decreased in the mutant seedlings. Complementation and CrispR tests confirmed the role of the GARS allele, which was expressed in all rice tissues, especially in the leaves. GARS protein displayed a typical chloroplast location pattern in rice protoplasts. Our results indicated that GARS was involved in chloroplast development at early leaf development by affecting the expression of plastid-encoded genes.

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