Metabolite specific effects of solar UV‐A and UV‐B on alder and birch leaf phenolics

Global Change Biology - Tập 14 Số 6 - Trang 1294-1304 - 2008
Titta Kotilainen1, Riitta Tegelberg2, Riitta Julkunen‐Tiitto3, Anders Lindfors4, Pedro J. Aphalo2
1Department of Biological and Environmental Sciences, PO Box 35, University of Jyväskylä, FIN-40014 Jyväskylä, Finland,
2Department of Biological and Environmental Sciences, PO Box 65, University of Helsinki, FIN-00014 Helsinki, Finland,
3Faculty of Biosciences, University of Joensuu, PO Box 111, FIN-80101 Joensuu, Finland
4Earth Observation, Finnish Meteorological Institute, PO Box 503, FIN-00101 Helsinki, Finland

Tóm tắt

AbstractWe measured the concentrations of ultraviolet (UV)‐absorbing phenolics varying in response to exclusion of either solar UV‐B or both solar UV‐A and UV‐B radiations in leaves of grey alder (Alnus incana) and white birch (Betula pubescens) trees under field conditions. In alder leaves 20 and in birch leaves 13 different phenolic metabolites were identified. The response to UV exclusion varied between and within groups of phenolics in both tree species. The changes in concentration for some metabolites suggest effects of only UV‐A or UV‐B, which band being effective depending on the metabolite. For some other metabolites, the results indicate that UV‐A and UV‐B affect concentrations in the same direction, while for a few compounds there was evidence suggesting opposite effects of UV‐A and UV‐B radiation. Finally, the concentration of some phenolics did not significantly respond to solar UV. We observed only minor effects on the summed concentration of all determined phenolic metabolites in alder and birch leaves, thus indicating that measuring only total phenolics concentration may not reveal the effects of radiation. Here, we show that the appropriate biological spectral weighting functions for plant‐protective responses against solar UV radiation extend in most cases – but not always – into the UV‐A region and more importantly that accumulation of different phenolic metabolites follows different action spectra. This demonstrates under field conditions that some of the implicit assumptions of earlier research simulating ozone depletion and studying the effects of UV radiation on plant secondary metabolites need to be reassessed.

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Thông tin xuất bản

Global Change Biology

Tập 14 Số 6

1294-1304

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