Inhibitory effect of solar radiation on thymidine and leucine incorporation by freshwater and marine bacterioplankton.

Applied and Environmental Microbiology
Ruben SommarugaR Psenner

Abstract

We studied the effect of solar radiation on the incorporation of [(sup3)H]thymidine ([(sup3)H]TdR) and [(sup14)C]leucine ([(sup14)C]Leu) by bacterioplankton in a high mountain lake and the northern Adriatic Sea. After short-term exposure (3 to 4 h) of natural bacterial assemblages to sunlight just beneath the surface, the rates of incorporation of [(sup3)H]TdR and [(sup14)C]Leu were reduced at both sites by up to (symbl)70% compared to those for the dark control. Within the solar UV radiation (290 to 400 nm), the inhibition was caused exclusively by UV-A radiation (320 to 400 nm). However, photosynthetically active radiation (PAR) (400 to 700 nm) contributed almost equally to this effect. Experiments with samples from the high mountain lake showed that at a depth of 2.5 m, the inhibition was caused almost exclusively by UV-A radiation. At a depth of 8.5 m, where chlorophyll a concentrations were higher than those in the upper water column, the rates of incorporation of [(sup3)H]TdR were higher in those samples exposed to full sunlight or to UV-A plus PAR than in the dark control. In laboratory experiments with artificial UV light, the incorporation of [(sup3)H]TdR and [(sup14)C]Leu by mixed bacterial lake cultures was also inhi...Continue Reading

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Citations

Mar 28, 2013·Environmental Monitoring and Assessment·Ammini ParvathiMaheswari Nair
Oct 31, 1998·Applied and Environmental Microbiology·J PernthalerR Amann
Feb 7, 2001·Applied and Environmental Microbiology·C WinterG J Herndl
Oct 24, 2006·Applied and Environmental Microbiology·V Fernández ZenoffM E Farías
Feb 17, 2015·Photochemistry and Photobiology·Richard SempéréMarc Mallet
Apr 7, 2005·Applied and Environmental Microbiology·Ruben SommarugaJosep M Gasol
Jun 22, 2013·Ecology and Evolution·Francisco J R C CoelhoNewton C M Gomes
Jul 9, 2004·Applied and Environmental Microbiology·Matthew J ChurchDavid M Karl
Jun 15, 2005·Nature Reviews. Microbiology·Jakob Pernthaler
Apr 15, 2006·Photochemistry and Photobiology·Marc Tedetti, Richard Sempéré
Aug 30, 2001·Applied and Environmental Microbiology·X A MoránJ M Gasol
Aug 27, 2009·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Sabine Matallana-SurgetFabien Joux
Nov 19, 2011·FEMS Microbiology Ecology·Clara Ruiz-GonzálezJosep M Gasol
Jul 6, 2018·Global Change Biology·Marie-Elodie PergaDamien Bouffard
Sep 9, 2005·Microbiology and Molecular Biology Reviews : MMBR·Jakob Pernthaler, Rudolf Amann
Sep 10, 2005·Applied and Environmental Microbiology·Falk WarneckeJakob Pernthaler
Feb 13, 2016·Journal of Plankton Research·Ruben Sommaruga

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