Stimulation of the diadinoxanthin cycle by UV-B radiation in the diatom Phaeodactylum tricornutum

Photosynthesis Research - Tập 59 - Trang 73-80 - 1999
Reimund Goss1, Heiko Mewes1, Christian Wilhelm1
1Institut für Botanik, Universität Leipzig, Leipzig, Germany

Tóm tắt

In this study we show that the diadinoxanthin cycle in the diatom Phaeodactylum tricornutum is stimulated by mild UV-B radiation. High steady state concentrations of diatoxanthin established during a period of strong actinic illumination with white light (300 μmol photons m-2 s-1 PAR) are further increased if weak UV-B (3 μmol photons m-2 s-1) is additionally applied. Short term increases in the diatoxanthin concentration caused by UV-B strongly correlate with a stoichiometric decrease in diadinoxanthin. The UV-B dependent increase in diatoxanthin is correlated with a concommitant enhancement of non-photochemical quenching of chlorophyll fluorescence and a decrease in the quantum efficiency of oxygen evolution. This indicates that UV-B induced diatoxanthin functions in thermal energy dissipation. Possible scenarios for a stimulation of the diadinoxanthin cycle by UV-B are discussed.

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