Different response of two reindeer forage plants to enhanced UV-B radiation: modification of the phenolic composition |
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Authors: | Fran?oise Martz Minna Turunen Riitta Julkunen-Tiitto Hanne Suokanerva Marja-Liisa Sutinen |
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Institution: | (1) Arctic Centre, University of Lapland, POB 122, 96101 Rovaniemi, Finland;(2) Rovaniemi Research Unit, Finnish Forest Research Institute, POB 16, 96301 Rovaniemi, Finland;(3) Natural Product Research Laboratories, Faculty of Biosciences, University of Joensuu, POB 111, 80101 Joensuu, Finland;(4) Arctic Research Centre, Finnish Meteorological Institute (FMI-ARC), T?htel?ntie 62, 99600 Sodankyl?, Finland; |
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Abstract: | The long-term effects of enhanced UV-B radiation on the content and composition of leaf phenolics in Epilobium
angustifolium L. and Eriophorum
russeolum Fries ex Hartman were studied in northern Finland (68°N) using two UV-B enhancement experiments, both simulating UV-BCIE radiation and corresponding to a 20% loss of ozone layer. High proportions of hydrolyzable tannins (69%) and condensed tannins
(66%) characterized both Epilobium and Eriophorum leaves, respectively. No UV treatment effect was detected in the content or composition of Epilobium leaf soluble phenolics, whereas significant UV effects were detected in Eriophorum leaves in a developmental-specific manner. At the end of the growing season, the proportion of total soluble phenolics was
higher in leaves exposed to enhanced UV-A and UV-B radiation than in the control leaves, but the phenolic composition was
not significantly modified. This study introduces a new example on plants’ phenolic response to UV radiation being species-specific
and detectable only at certain developmental stages. Possible consequences of increased phenolic content in forage plants
for selection and digestibility by reindeer are, however, not yet known. |
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