biostudies-literatureZhang Fthe Natural Science Foundation of Jiangxi ProvinceNational Natural Science Foundation of China43https://www.ebi.ac.uk/biostudies/studies/S-EPMC9357590biostudies-literatureUnknown15(1)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 × 10⁶) and purple (68.0 × 10⁶) grain hulls. The relative contents of hesperetin O-malonyl-hexoside, apigenin derivatives, genistein derivatives, and kaemRice (New York, N.Y.)Flavonoid Metabolic Profiles and Gene Mapping of Rice (Oryza sativa L.) Purple Gradient Grain Hulls.PMC9357590Nos. 2020BABL205018Nos. 32160467Nos. 31800640Nos. 31960085Zhang FYang LHuang WXie JChen YLuo XHu BfalseFlavonoid Metabolic Profiles and Gene Mapping of Rice (Oryza sativa L.) Purple Gradient Grain Hulls.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 × 10⁶) and purple (68.0 × 10⁶) grain hulls. The relative contents of hesperetin O-malonyl-hexoside, apigenin derivatives, genistein derivatives, and kaem2022-01-01T00:00:00Z2022 Aug2025-04-04T08:45:05.619Z2025-04-04T08:45:05.619ZS-EPMC93575903593475410.1186/s12284-022-00589-x