OsMYB3 is a R2R3-MYB gene responsible for anthocyanin biosynthesis in black rice

文献类型： 外文期刊

第一作者： Zheng, Jie

作者： Zheng, Jie;Zhao, Mingchao;Yang, Zenan;Lin, Yongjun;Chen, Hao;Zheng, Jie;Zhao, Mingchao;Yang, Zenan;Lin, Yongjun;Chen, Hao;Zheng, Jie;Wu, Hao;Guo, Yongmei

作者机构：

关键词： Oryza sativa; Pigmented rice; MBW complex; Flavonoid biosynthesis

期刊名称：MOLECULAR BREEDING （ 影响因子：2.589； 五年影响因子：2.75 ）

ISSN： 1380-3743

年卷期： 2021 年 41 卷 9 期

页码：

收录情况： SCI

摘要： Black rice is a rare type of rice germplasm with various health benefits that are largely attributed to anthocyanin pigment accumulation in the pericarps. The anthocyanin biosynthesis in plant tissues is activated mainly by the MBW complexes, consisting of three types of transcription factors R2R3-MYB, bHLH, and WDR. In black rice, the bHLH and WDR components regulating anthocyanin biosynthesis in pericarps have been characterized, while the R2R3-MYB factor remains unknown. By examining the expression correlation between all putative rice MYB genes and anthocyanin biosynthesis-related genes based on transcriptome data of pericarps in combination with further molecular and genetic analysis, we proved that OsMYB3 (LOC_Os03g29614) was the determinant R2R3-MYB gene for anthocyanin biosynthesis in rice pericarps. The expression level of OsMYB3 in pericarps of black rice was significantly higher than that of white rice. The knockout of OsMYB3 in a black rice variety caused significant downregulation of 19 anthocyanin metabolites and many other flavonoids in grains. Our research deepens the understanding of regulatory system for anthocyanin biosynthesis in rice pericarps and provides implications for breeding black rice varieties with high anthocyanin level.

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