Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Photosynthetic and growth response of freshwater picocyanobacteria are strain-specific and sensitive to photoacclimation |
| Abstract | We investigated the effect of different light conditions on primary production and growth rates of three closely related freshwater picocyanobacterial strains from three different ribotypes in laboratory cultures. The primary goal was to test whether not only different pigment types (PC-rich versus PE-rich) but also other physiological characteristics suggested by different phylogenetic positions could affect growth and photosynthetic rates of picocyanobacteria. Secondly, we tested whether photacclimation is strain specific. Experiments were conducted over light intensities ranging from 6 to 1500 µmol photons m-2 s-1 with cultures that were acclimated to low (10 µmol photons m-2 s-1) and moderate (100 µmol photons m-2 s-1) irradiance. The PE-rich strain was sensitive to high light conditions and reached highest photosynthesis and growth rates at low light intensities. The relative effect of photoacclimation was different between the two PC-rich strains, with one strain showing only moderate changes in growth rates in response to the light level used during the acclimation period. Overall, growth rates differed widely in response to light intensity and photoacclimation. Photoacclimation significantly affected both primary production and growth rates of all three strains investigated. We conclude that strain-specific photoacclimation adds to the niche partitioning among closely related freshwater picocyanobacteria. |
| Source | Journal of plankton research 31(4), pp. 349–357 |
| Keywords | Ecotypesgrowth ratesP/E curvesphotoacclimationpicocyanobacteria |
| Journal | Journal of plankton research |
| Editor | Information Retrieval Inc.],, [New York,, Stati Uniti d'America |
| Year | 2009 |
| Type | Articolo in rivista |
| Authors | Moser M. (1), Callieri C., Weisse T. (1) |
| Text | 53130 2009 Ecotypes growth rates P/E curves photoacclimation picocyanobacteria Photosynthetic and growth response of freshwater picocyanobacteria are strain specific and sensitive to photoacclimation Moser M. 1 , Callieri C., Weisse T. 1 1 Institute for Limnology of The Austrian Academy of Sciences, Mondseestr. 9, A 5310 Mondsee, Austria We investigated the effect of different light conditions on primary production and growth rates of three closely related freshwater picocyanobacterial strains from three different ribotypes in laboratory cultures. The primary goal was to test whether not only different pigment types PC rich versus PE rich but also other physiological characteristics suggested by different phylogenetic positions could affect growth and photosynthetic rates of picocyanobacteria. Secondly, we tested whether photacclimation is strain specific. Experiments were conducted over light intensities ranging from 6 to 1500 µmol photons m 2 s 1 with cultures that were acclimated to low 10 µmol photons m 2 s 1 and moderate 100 µmol photons m 2 s 1 irradiance. The PE rich strain was sensitive to high light conditions and reached highest photosynthesis and growth rates at low light intensities. The relative effect of photoacclimation was different between the two PC rich strains, with one strain showing only moderate changes in growth rates in response to the light level used during the acclimation period. Overall, growth rates differed widely in response to light intensity and photoacclimation. Photoacclimation significantly affected both primary production and growth rates of all three strains investigated. We conclude that strain specific photoacclimation adds to the niche partitioning among closely related freshwater picocyanobacteria. 31 4 Published version Articolo pubblicato 10_Moser_et_al_2009_JPR.pdf Articolo in rivista Information Retrieval Inc. , 0142 7873 Journal of plankton research Journal of plankton research J. plankton res. Journal of plankton research. cristiana.callieri CALLIERI CRISTIANA TA.P02.014.002 Impatto dei cambiamenti globali sugli ecosistemi acquatici |