Abstract
Long-term effects of ultraviolet (UV) radiation on flavonoid biosynthesis were investigated in Arabidopsis thaliana using the sun simulators of the Helmholtz Zentrum München. The plants, which are widely used as a model system, were grown (1) at high photosynthetically active radiation (PAR; 1,310 µmol m−2 s−1) and high biologically effective UV irradiation (UV-BBE 180 mW m−2) during a whole vegetative growth period. Under this irradiation regime, the levels of quercetin products were distinctively elevated with increasing UV-B irradiance. (2) Cultivation at high PAR (1,270 µmol m−2 s−1) and low UV-B (UV-BBE 25 mW m−2) resulted in somewhat lower levels of quercetin products compared to the high-UV-BBE conditions, and only a slight increase with increasing UV-B irradiance was observed. On the other hand, when the plants were grown (3) at low PAR (540 µmol m−2 s−1) and high UV-B (UV-BBE 180 mW m−2), the accumulation of quercetin products strongly increased from very low levels with increasing amounts of UV-B but the accumulation of kaempferol derivatives and sinapoyl glucose was less pronounced. We conclude (4) that the accumulation of quercetin products triggered by PAR leads to a basic UV protection that is further increased by UV-B radiation. Based on our data, (5) a combined effect of PAR and different spectral sections of UV radiation is satisfactorily described by a biological weighting function, which again emphasizes the additional role of UV-A (315–400 nm) in UV action on A. thaliana.
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This work was supported by the Bavarian State Ministry of Sciences, Research, and the Arts in the program BayForUV.
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The authors declare that they have no conflict of interest.
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Dedicated to Professor Cornelius Lütz on the occasion of his 65th birthday
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Götz, M., Albert, A., Stich, S. et al. PAR modulation of the UV-dependent levels of flavonoid metabolites in Arabidopsis thaliana (L.) Heynh. leaf rosettes: cumulative effects after a whole vegetative growth period. Protoplasma 243, 95–103 (2010). https://doi.org/10.1007/s00709-009-0064-5
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DOI: https://doi.org/10.1007/s00709-009-0064-5