%0 Journal Article %1 kolb2004sonnenbrand %A Kolb, C A %A Riederer, Markus %A Pfündel, Erhard E %D 2004 %J Verlag Dr. Friedrich Pfeil, München %K myown %P 111-116 %T Sonnenbrand bei Weinbeeren. Rundgespräche der Kommission für Ökologie %X The role of phenolics in UV-screening was investigated in berries of a white grape cultivar (Vitis vinifera L. cv. Bacchus). Glavonols and hydroxycinnamic acids were identified as the main groups of UV-absorbing phenolics. Relationships between natural radiation and the synthesis of phenolics were studied in plants that were cultivated in the absence of UV radiation in a greenhouse prior to outdoor exposure to three different light regimes: (1) the entire solar spectrum, (2) the solar sprectrum minus UV-B radiation and (3) only visible radiation. During six days of exposure, flavonol synthsis was significantly stimulated by natural UV, in particular UV-B, but concetrations of hydroxycinnamic acids decreased under all conditions. While increased flavonol levels resutled in efficient UV-A shielding was incomplete probably due to decreased levels of the UV-B-absorbing hydroxycinnamic acids during exposure. Decreased UV-B-shielding might be involved in severe sunburn damage in the presence of UV-B radiation.

@article{kolb2004sonnenbrand, abstract = {The role of phenolics in UV-screening was investigated in berries of a white grape cultivar (Vitis vinifera L. cv. Bacchus). Glavonols and hydroxycinnamic acids were identified as the main groups of UV-absorbing phenolics. Relationships between natural radiation and the synthesis of phenolics were studied in plants that were cultivated in the absence of UV radiation in a greenhouse prior to outdoor exposure to three different light regimes: (1) the entire solar spectrum, (2) the solar sprectrum minus UV-B radiation and (3) only visible radiation. During six days of exposure, flavonol synthsis was significantly stimulated by natural UV, in particular UV-B, but concetrations of hydroxycinnamic acids decreased under all conditions. While increased flavonol levels resutled in efficient UV-A shielding was incomplete probably due to decreased levels of the UV-B-absorbing hydroxycinnamic acids during exposure. Decreased UV-B-shielding might be involved in severe sunburn damage in the presence of UV-B radiation.}, added-at = {2013-02-28T18:22:14.000+0100}, author = {Kolb, C A and Riederer, Markus and Pfündel, Erhard E}, biburl = {https://www.bibsonomy.org/bibtex/251845b746cba653aa558dd20ff0b71eb/riederer}, interhash = {966b3d92d8da2be2704dd3df15480f8b}, intrahash = {51845b746cba653aa558dd20ff0b71eb}, journal = {Verlag Dr. Friedrich Pfeil, München}, keywords = {myown}, pages = {111-116}, timestamp = {2013-02-28T18:22:14.000+0100}, title = {Sonnenbrand bei Weinbeeren. Rundgespräche der Kommission für Ökologie}, year = 2004 }