Flavonoid Metabolic Profiles and Gene Mapping of Rice (Oryza sativa L.) Purple Gradient Grain Hulls
文献类型： 外文期刊
作者： Zhang, Fantao 1 ; Yang, Limin 1 ; Huang, Wenxue 1 ; Luo, Xiangdong 1 ; Xie, Jiankun 1 ; Hu, Biaolin 2 ; Chen, Yaling 1 ;
作者机构： 1.Jiangxi Normal Univ, Coll Life Sci, Lab Plant Genet Improvement & Biotechnol, 99,Ziyang Rd, Nanchang 330022, Jiangxi, Peoples R China
2.Natl Engn Lab Rice Nanchang, Rice Res Inst, Jiangxi Acad Agr Sci, 1738,Liangtangbei Rd, Nanchang 330200, Jiangxi, Peoples R China
关键词： Rice; Purple gradient grain hull; Cyanidin; BSA-seq; Flavonoids
期刊名称：RICE （ 影响因子：5.638； 五年影响因子：6.097 ）
ISSN： 1939-8425
年卷期： 2022 年 15 卷 1 期
页码：
收录情况： SCI
摘要： Rice (Oryza sativa L.) grain hull color is an easily observable trait and regarded as a crucial morphological marker in rice breeding. Here, a purple gradient grain hull mutant (pg) was found from natural mutations of a straw-white grain hull rice variety IARI 6184B (Orzya sativa L. subsp. indica). The color of the mutant grain hulls changed from straw-white to pink, then purple, and finally brownish-yellow. Ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) identified 217 flavonoids, including 18 anthocyanins, among which cyanidin O-syringic acid had the highest concentration in pink (66.2 x 10(6)) and purple (68.0 x 10(6)) grain hulls. The relative contents of hesperetin O-malonyl-hexoside, apigenin derivatives, genistein derivatives, and kaempferol 3-O derivatives were consistently downregulated during pg grain hull development. Conversely, 12 anthocyanins were upregulated in colored hulls, and cyanidin 3-O-malonylhexoside was abundant only in pink and purple grain hulls. Moreover, the candidate gene was mapped into a 1.38 Mb region on chromosome 4 through bulked segregant analysis based on deep sequencing (BSA-seq) and gene mapping approaches. These results increased our understanding of anthocyanin biosynthesis in rice grains, helping rice breeders to select new rice varieties with desirable grain traits.
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