The Effects of UV‐B Radiation Intensity on Biochemical Parameters and Active Ingredients in Flowers of Qi Chrysanthemum and Huai Chrysanthemum

Abstract

The article studied UV-B effects on biochemical parameters and active ingredients in flowers of Qi chrysanthemum and Huai chrysanthemum during the bud stage. The experiment included four UV-B radiation levels (CK, ambient UV-B; T1, T2 and T3 indicated a 5%, 10% and 15% increase in ambient UV-BBE, respectively) to determine the optimal UV-B radiation intensity in regulating active ingredients level in flowers of two chrysanthemum varieties. Flower dry weight of two cultivars was not affected by UV-B radiation under experimental conditions reported here. UV-B treatments significantly increased the rate of superoxide radical production, hydrogen peroxide (H2O2) (except for T1) and malondialdehyde concentration in flowers of Huai chrysanthemum and H2O2 concentration in flowers of Qi chrysanthemum. T2 and T3 treatments induced a significant increase in phenylalanine ammonia lyase enzyme (PAL) activity, anthocyanins, proline, ascorbic acid, chlorogenic acid and flavone content in flowers of two chrysanthemum varieties, and there were no significant differences in PAL activity, ascorbic acid, flavone and chlorogenic acid content between the two treatments. These results indicated that appropriate UV-B radiation intensity did not result in the decrease in flower yield, and could regulate PAL activity and increase active ingredients content in flowers of two chrysanthemum varieties.

Improvement for Oxidative Stability and Sensory Properties of Sunflower Oil Flavored by Huai Chrysanthemum × morifolium Ramat. Essential Oil during Accelerated Storage

“…As a Chinese traditional herb, a large number of cultivars of C. morifolium were gradually evolved, and Huai C. morifolium is one of them, which was widely cultivated in Jiaozuo, Henan province [30]. In the present study, the essential oil was extracted (yield = 0.53% w/w) from Huai C. morifolium flowers.…”

Ultraviolet radiation modulates both constitutive and inducible plant defenses against thrips but is dose and plant genotype dependent

“…In recent years, several studies have reported the use of supplemental UV to alter the chemistry of medicinal chrysanthemum (Chrysanthemum morifolium Ramat) flowers, for which the main active components are flavonoids and chlorogenic acid (Yao et al 2014;Ma et al 2016). Here we showed that supplemental UV radiation can be used to enhance chrysanthemum defenses against an important insect pest during the vegetative stage as well.…”

Biochemical traits and proteomic changes in postharvest flowers of medicinal chrysanthemum exposed to enhanced UV-B radiation

“…Delta 1-pyrroline-5-carboxylate synthetase 2 protein (spot 1468) catalyzes the first two steps of proline biosynthesis in plants [50]. Many studies have proved that proline metabolism is a typical mechanism of biochemical adaptation in living organisms subjected to stressful conditions [51], such as salt stress [52], drought [53] and UV stress [11]. Nucleoside diphosphate kinase (NDPK, spot 1590) is mainly located in the cytoplasm, which catalyzes the transfer of gamma phosphate from ATP to cognate nucleoside diphosphates (NDP) to maintain the balance between cellular ATP and other NTPs [54].…”

“…However, some interesting results about UV-B-beneficial effects on secondary metabolism processes in medicinal plants have been found in recent years [5][6][7][8][9][10][11][12]. Most of medically active ingredients in medicinal plants are secondary metabolites.…”