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Effects of Enhanced UV ‐B Radiation on Biochemical Traits in Postharvest Flowers of Medicinal Chrysanthemum
Author(s) -
Si Chao,
Yao XiaoQin,
He XueLi,
Chu JianZhou,
Ma ChunHui,
Shi XiaoFei
Publication year - 2015
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/php.12450
Subject(s) - postharvest , phenylalanine ammonia lyase , hydrogen peroxide , chemistry , chlorophyll , carotenoid , food science , cinnamic acid , phenylalanine , ultraviolet , horticulture , botany , nuclear chemistry , enzyme , peroxidase , biochemistry , biology , organic chemistry , materials science , amino acid , optoelectronics
This article reported UV ‐B radiation effects on biochemical traits in postharvest flowers of chrysanthemum. The experiment included six levels of UV ‐B radiation ( UV 0, 0 μ W cm −2 ; UV 50, 50 μ W cm −2 ; UV 200, 200 μ W cm −2 ; UV 400, 400 μ W cm −2 ; UV 600, 600 μ W cm −2 and UV 800, 800 μ W cm −2 ). Enhanced UV ‐B radiation significantly increased hydrogen peroxide content (except for UV 50), but did not evidently affect malondialdehyde content in flowers. Chlorophyll b and total chlorophyll content were significantly increased by UV 600 and UV 800. UV 400 and UV 600 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 (4 CL ) activity was significantly decreased by enhanced UV ‐B radiation (except for UV 50). 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 4 CL 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 UV 400‐ UV 600.