A mutation in the rice chalcone isomerase gene causes the golden hull and internode 1 phenotype

文献类型： 外文期刊

第一作者： Hong, Lilan

作者： Hong, Lilan;Tang, Ding;Wang, Kejian;Li, Ming;Cheng, Zhukuan;Qian, Qian

作者机构：

关键词： Chalcone isomerase;Flavonoid;gh1;Rice

期刊名称：PLANTA （ 影响因子：4.116； 五年影响因子：4.316 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： The biosynthesis of flavonoids, important secondary plant metabolites, has been investigated extensively, but few mutants of genes in this pathway have been identified in rice (Oryza sativa). The rice gold hull and internode (gh) mutants exhibit a reddish-brown pigmentation in the hull and internode and their phenotype has long been used as a morphological marker trait for breeding and genetic study. Here, we characterized that the gh1 mutant was a mutant of the rice chalcone isomerase gene (OsCHI). The result showed that gh1 had a Dasheng retrotransposon inserted in the 5′ UTR of the OsCHI gene, which resulted in the complete loss of OsCHI expression. gh1 exhibited golden pigmentation in hulls and internodes once the panicles were exposed to light. The total flavonoid content in gh1 hulls was increased threefold compared to wild type. Consistent with the gh1 phenotype, OsCHI transcripts were expressed in most tissues of rice and most abundantly in internodes. It was also expressed at high levels in panicles before heading, distributed mainly in lemmas and paleae, but its expression decreased substantially after the panicles emerged from the sheath. OsCHI encodes a protein functionally and structurally conserved to chalcone isomerases in other species. Our findings demonstrated that the OsCHI gene was indispensable for flux of the flavonoid pathway in rice.

分类号： Q94

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