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• W2102805480 abstract "This study aimed to quantify and identify flavonoids involved in the response of nine populations of white clover ( Trifolium repens L.) to ultraviolet-B radiation (UV-B). Plants were grown for 12 weeks in controlled environment rooms with or without supplemental UV-B radiation of 13.3 kJ m −2 d −1 . Methanol–water extractable flavonoids were quantified using high performance liquid chromatography (HPLC). Two major peaks showed significant enhancement in the HPLC chromatogram in response to supplemental UV-B. The structures of the compounds responsible were identified by 1 H and 13 C nuclear magnetic resonance (NMR) spectroscopy to be the flavonols quercetin-3-O-β- D -xylopyranosyl-(1 → 2)-β- D -galactopyranoside and kaempferol-3-O-β- D -xylopyranosyl-(1 → 2)-β- D -galactopyranoside. With supplemental UV-B, quercetin glycoside levels increased on average by 200% while the kaempferol glycoside response was much smaller. Significant differences in flavonol accumulation were found among T. repens populations, both constitutively and in response to UV-B. Stress-adapted populations displayed particularly high flavonol levels under UV-B. There was an inverse correlation between plant productivity and quercetin accumulation. Furthermore, higher quercetin accumulation under UV-B was correlated with tolerance against UV-B-induced growth reduction. In conclusion, within-species comparisons in T. repens lend support to a distinct role for ortho -dihydroxylated flavonoids in the adaptation to UV-B stress and suggest particular advantages in this UV-B-induced biochemical adaptation for populations characterized by low habitat and plant productivity. Copyright 2000 Annals of Botany Company" @default.
• W2102805480 created "2016-06-24" @default.
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• W2102805480 date "2000-09-01" @default.
• W2102805480 modified "2023-10-01" @default.
• W2102805480 title "Responses of Nine Trifolium repens L. Populations to Ultraviolet-B Radiation: Differential Flavonol Glycoside Accumulation and Biomass Production" @default.
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• W2102805480 doi "https://doi.org/10.1006/anbo.2000.1216" @default.
• W2102805480 hasPublicationYear "2000" @default.
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