科研之友
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摘要
Abelmoschus manihot is an important medicinal plant, and flavonoids extracted from its flowers have been applied to treat burns, chronic kidney disease and oral ulcers. However, little is known about the composition of flavonoids and their dynamic changes at different development stages of flowers. In this study, the presence of flavonoids in flowers at four stages, including bud (Stage A), post-bud (Stage B), full-bloom (Stage C) and final-bloom (Stage D), was determined using widely targeted metabolomics. A total of 182 flavonoid metabolites were identified, including 53 flavone, 40 flavonol, 13 isoflavone, 14 flavanone, 28 flavone C-glycosides, 5 flavonolignan, 3 proanthocyanidins, 16 anthocyanins and 10 catechin derivatives. The total flavonoid content of flowers was the highest at Stage C. Stage A could be clearly separated from other three stages through clustering analysis and principal component analysis. There were 67, 88 and 61 differential metabolites between Stage A and Stage B/C/D, respectively. Contents of most differential metabolites significantly increased at Stage B and C, including four major bioactive flavonols (hyperoside, rutin, quercetin and myricetin). Hyperoside biosynthesis pathway was well established according to the detected flavonoids in the flowers. Besides, several flavonols with high relative content and different biological activities were first reported in this plant, such as myricetin 3-O-galactoside, avicularin and isorhamnetin 3-O-neohesperidoside. These results could be beneficial to understand the relationship between flavonoid metabolites and flower development of A. manihot, and provide the foundation for the sufficient utilization in the future.
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单位广东省农业科学院
