A comprehensive genetic study reveals a crucial role of CYP90D2/D2 in regulating plant architecture in rice (Oryza sativa)

文献类型： 外文期刊

第一作者： Li, Hui

作者： Li, Hui;Jiang, Ling;Wan, Jianmin;Sun, Wei;Cheng, Zhijun;Jin, Tianyun;Ma, Xiaoding;Guo, Xiuping;Wang, Jiulin;Zhang, Xin;Wu, Fuqing;Wu, Chuanyin;Wan, Jianmin;Youn, Ji-Hyun;Kim, Seong-Ki

作者机构：

关键词： brassinosteroid biosynthesis;C-23 hydroxylase;C-3 dehydrogenase;chromosome segment deleted dwarf 1 (csdd1);CYP90D2/D2;dwarf;plant architecture;rice (Oryza sativa)

期刊名称：NEW PHYTOLOGIST （ 影响因子：10.151； 五年影响因子：10.475 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Brassinosteroids (BRs) are essential regulators of plant architecture. Understanding how BRs control plant height and leaf angle would facilitate development of new plant type varieties by biotechnology. A number of mutants involved in BR biosynthesishave been isolated but many of them lack detailed genetic analysis. Here, we report the isolation and characterization of a severe dwarf mutant, chromosome segment deleted dwarf 1 (csdd1), which was deficient in BR biosynthesis in rice. We isolated themutant by screening a tissue culture-derived population, cloned the gene by mapping, and confirmed its function by complementary and RNAi experiments, combined with physiological and chemical analysis. We showed that the severe dwarf phenotype was causedby a complete deletion of a cytochrome P450 gene, CYP90D2/D2, which was further confirmed in two independent T-DNA insertion lines in different genetic backgrounds and by RNA interference. Our chemical analysis suggested that CYP90D2/D2 might catalyze C-3 dehydrogenation step in BR biosynthesis. We have demonstrated that the CYP90D2/D2 gene plays a more important role than previously reported. Allelic mutations of CYP90D2/D2 confer varying degrees of dwarfism and leaf angle, thus providing useful information for molecular breeding in grain crop plants.

分类号： Q94

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