title: Effects of Enhanced UV-B Radiation on Biochemical Traits in Postharvest Flowers of Medicinal Chrysanthemum.
abstract: This article reported UV-B radiation effects on biochemical traits in postharvest flowers of chrysanthemum. The experiment included six levels of UV-B radiation (UV0, 0 μW cm(-2); UV50, 50 μW cm(-2); UV200, 200 μW cm(-2); UV400, 400 μW cm(-2); UV600, 600 μW cm(-2) and UV800, 800 μW cm(-2). Enhanced UV-B radiation significantly increased hydrogen peroxide content (except for UV50), but did not evidently affect malondialdehyde content in flowers. Chlorophyll b and total chlorophyll content were significantly increased by UV600 and UV800. UV400 and UV600 significantly increased anthocyanins, carotenoids and UV-B absorbing compounds content, and the activities of phenylalanine ammonia lyase (PAL) and cinnamic acid-4-hydroxylase (C4H) over the control. 4-coumarate CoA ligase (4CL) activity was significantly decreased by enhanced UV-B radiation (except for UV50). The relationships between UV-B radiation intensities and the activities of secondary metabolism enzymes were best described by a second-order polynomial. The R(2) values for UV-B radiation intensities and the activities of PAL, C4H and 4CL were 0.8361, 0.5437 and 0.8025, respectively. The results indicated that enhanced UV-B radiation could promote secondary metabolism processes in postharvest flowers, which might be beneficial for the accumulation of medically active ingredients in medicinal plants. The optimal UV-B radiation intensities in the study were between UV400-UV600.
authors.affiliation: The College of Life Sciences, Hebei University, Baoding, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Si
authors.affiliation: The College of Life Sciences, Hebei University, Baoding, China.
authors.forename: Xiao-Qin
authors.initials: XQ
authors.lastname: Yao
authors.affiliation: The College of Life Sciences, Hebei University, Baoding, China.
authors.forename: Xue-Li
authors.initials: XL
authors.lastname: He
authors.affiliation: The College of Life Sciences, Hebei University, Baoding, China.
authors.forename: Jian-Zhou
authors.initials: JZ
authors.lastname: Chu
authors.affiliation: The College of Life Sciences, Hebei University, Baoding, China.
authors.forename: Chun-Hui
authors.initials: CH
authors.lastname: Ma
authors.affiliation: The College of Life Sciences, Hebei University, Baoding, China.
authors.forename: Xiao-Fei
authors.initials: XF
authors.lastname: Shi
mesh_terms: D000872:Anthocyanins / Q000737:chemistry; D031202:Chrysanthemum / Q000737:chemistry*; D035264:Flowers / Q000737:chemistry*; D010788:Photosynthesis; D014466:Ultraviolet Rays
chemical_list: D000872:Anthocyanins