caa a22 4500 397553013 CHVBK 20180308164755.0 cr unu---uuuuu 161202e199601 xx s 000 0 eng 10.1111/j.1574-6941.1996.tb00198.x doi (NATIONALLICENCE)oxford-10.1111/j.1574-6941.1996.tb00198.x Effects of solar radiation and solar radiation deprived of UV-B and total UV on photosynthetic oxygen production and pulse amplitude modulated fluorescence in the brown alga Padina pavonia [Elektronische Daten] [Donat-P. Häder, Heike Herrmann, Regas Santas] The effects of solar radiation on photosynthetic oxygen production and pulse amplitude modulated (PAM) fluorescence were measured in the marine brown macroalga Padina pavonia harvested from different depths from the Greek coast near Korinth. In fluence rate-response curves the light compensation point for photosynthetic oxygen production increased and the saturation level decreased with increasing exposure time to solar radiation. Cutting off the UV-B wavelength range (280-315 nm) from solar radiation reduced the inhibition of photosynthesis, and the organisms were less affected when all of the UV radiation was filtered out. Algae collected from 7 m depth were much more prone to photoinhibition than those harvested from rock pools exposed to unfiltered solar radiation. During continuous exposure to solar radiation, rock pool algae showed photoinhibition after longer periods of time than specimens from 7 m or from dark adapted habitats. When subjected to unfiltered solar radiation the ratio of the variable fluorescence to the maximal fluorescence (Fv = Fm− Fo) rapidly declined with increasing exposure time. However, again algae from 7 m depth were more prone to photoinhibition than rock pool algae. The differences between the two ecological strains were less obvious when UV-B or total UV was removed from solar radiation. Only in the latter case a complete recovery was observed after 2 h while, when exposed to unifiltered sunlight, only the rock pool algae recovered completely within that time. © 1996 Federation of European Microbiological Societies. All rights reserved Clark electrode nationallicence Oxygen measurements nationallicence Padina pavonia nationallicence Pulse amplitude modulated fluorescence nationallicence Phaeophyta nationallicence Photoinhibition nationallicence Solar radiation nationallicence Ultraviolet radiation nationallicence Häder Donat-P Institut für Botanik und Pharmazeutische Biologie, Friedrich-Alexander-Universität, Staudtstr. 5, D-91058 Erlangen, Germany aut Herrmann Heike Institut für Botanik und Pharmazeutische Biologie, Friedrich-Alexander-Universität, Staudtstr. 5, D-91058 Erlangen, Germany aut Santas Regas Oikotechnics, Athens Helioupolis 16342, Keffalenias 50, Greece aut FEMS Microbiology Ecology Blackwell Publishing Ltd 19/1(1996-01), 53-61 19:1<53 1996 19 femsec https://doi.org/10.1111/j.1574-6941.1996.tb00198.x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1111/j.1574-6941.1996.tb00198.x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Häder Donat-P Institut für Botanik und Pharmazeutische Biologie, Friedrich-Alexander-Universität, Staudtstr. 5, D-91058 Erlangen, Germany aut NATIONALLICENCE 700 1- Herrmann Heike Institut für Botanik und Pharmazeutische Biologie, Friedrich-Alexander-Universität, Staudtstr. 5, D-91058 Erlangen, Germany aut NATIONALLICENCE 700 1- Santas Regas Oikotechnics, Athens Helioupolis 16342, Keffalenias 50, Greece aut NATIONALLICENCE 773 0- FEMS Microbiology Ecology Blackwell Publishing Ltd 19/1(1996-01), 53-61 19:1<53 1996 19 femsec Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford