title: Effects of enhanced UV-B radiation on the nutritional and active ingredient contents during the floral development of medicinal chrysanthemum.
abstract: The paper mainly studied the effects of enhanced UV-B radiation on the nutritional and active ingredient contents during the floral development of medicinal chrysanthemum. The experiment included two levels of UV-B radiation (0 and 400μWcm(-2)). The contents of hydrogen peroxide (H2O2), anthocyanin, UV-B absorbing compounds, total chlorophyll and carotenoids, and the activities of phenylalanine ammonia lyase enzyme (PAL) and cinnamic acid-4-hydroxylase enzyme (C4H) in flowers significantly decreased with the floral development. However, the contents of soluble sugar, amino acid and total vitamin C in flowers significantly increased with the floral development. The contents of flavonoid and chlorogenic acid were significantly different in the four stages of floral development, and their highest contents were found in the bud stage (stage 2). In the four stages of floral development, enhanced UV-B radiation significantly increased the contents of H2O2, UV-B absorbing compounds, chlorophyll, carotenoids, soluble sugar, amino acid, vitamin C, flavonoid and chlorogenic acid, and the activities of PLA and C4H in flowers. The results indicated that the highest contents of active and nutrient ingredients in flowers were found not to be in the same developmental stages of flowers. Comprehensive analysis revealed that the best harvest stage of chrysanthemum flowers was between the bud stage and the young flower stage (stage 2 and stage 3), which could simultaneously gain the higher contents of active and nutritional ingredients in flowers.
authors.affiliation: The College of Life Sciences, Hebei University, Baoding 071002, China.
authors.forename: Chun Hui
authors.initials: CH
authors.lastname: Ma
authors.affiliation: The College of Life Sciences, Hebei University, Baoding 071002, China.
authors.forename: Jian Zhou
authors.initials: JZ
authors.lastname: Chu
authors.affiliation: The College of Life Sciences, Hebei University, Baoding 071002, China.
authors.forename: Xiao Fei
authors.initials: XF
authors.lastname: Shi
authors.affiliation: The College of Life Sciences, Hebei University, Baoding 071002, China.
authors.forename: Cun Qi
authors.initials: CQ
authors.lastname: Liu
authors.affiliation: The College of Life Sciences, Hebei University, Baoding 071002, China. Electronic address: yaoxiao301@126.com.
authors.forename: Xiao Qin
authors.initials: XQ
authors.lastname: Yao
mesh_terms: D031202:Chrysanthemum / Q000201:enzymology / Q000254:growth & development / Q000378:metabolism*; D035264:Flowers / Q000254:growth & development*; D006861:Hydrogen Peroxide / Q000378:metabolism; D008315:Malondialdehyde / Q000378:metabolism; D010946:Plants, Medicinal / Q000201:enzymology / Q000254:growth & development / Q000378:metabolism*; D014466:Ultraviolet Rays
chemical_list: D008315:Malondialdehyde; D006861:Hydrogen Peroxide
keywords: Chlorogenic acid; Chrysanthemum; Postharvest flower; UV-B radiation