Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Microcolony Formation by Single-Cell Synechococcus Strains as a Fast Response to UV Radiation |
| Abstract | UV radiation (UVR) has different effects on prokaryotic cells, such as, for instance, filamentation and aggregation in bacteria. Here we studied the effect of UVR on microcolony formation in two freshwater Synechococcus strains of different ribotypes (group B and group I) and phycobiliprotein compositions (phycoerythrin [PE] and phycocyanin [PC]). Each strain was photoacclimated at two light intensities, low light (LL) (10 mu mol m(-2) s(-1)) and moderate light (ML) (100 mu mol m(-2) s(-1)). The cultures were exposed for 6 days to treatments with UVR or without UVR. PE-rich Synechococcus acclimated to LL had a low carotenoid/chlorophyll a (car/chl) ratio but responded faster to UVR treatment, producing the highest percentages of microcolonies and of cells in microcolonies. Conversely, the same strain acclimated to ML, with a higher car/chl ratio, did not aggregate significantly. These results suggest that microcolony formation by PE-rich Synechococcus is induced by UVR if carotenoid levels are low. PC-rich Synechococcus formed a very low percentage of microcolonies in both acclimations even with low car/chl ratio. The different responses of the two Synechococcus strains to UVR depend on their pigment compositions. On the other hand, this study does not exclude that UVR-induced microcolony formation could also be related to specific ribotypes |
| Source | Applied and environmental microbiology (Print) 77 (21), pp. 7533–7540 |
| Keywords | CYANOBACTERIUM MICROCYSTIS-AERUGINOSA; WATER AUTOTROPHIC PICOPLANKTON; ULTRAVIOLET-RADIATION; PICOCYANOBACTERIA; LAKES |
| Journal | Applied and environmental microbiology (Print) |
| Editor | American Society for Microbiology., [Washington], Stati Uniti d'America |
| Year | 2011 |
| Type | Articolo in rivista |
| DOI | 10.1128/AEM.05392-11 |
| Authors | Callieri, C (Callieri, Cristiana) ; Lami, A (Lami, Andrea) ; Bertoni, R (Bertoni, Roberto) |
| Text | 203379 2011 10.1128/AEM.05392 11 ISI Web of Science WOS 000296568200012 Scopus 2 s2.0 83155163753 CYANOBACTERIUM MICROCYSTIS AERUGINOSA; WATER AUTOTROPHIC PICOPLANKTON; ULTRAVIOLET RADIATION; PICOCYANOBACTERIA; LAKES Microcolony Formation by Single Cell Synechococcus Strains as a Fast Response to UV Radiation Callieri, C Callieri, Cristiana ; Lami, A Lami, Andrea ; Bertoni, R Bertoni, Roberto CNR, Inst Ecosyst Study, I 28922 Verbania, Italy UV radiation UVR has different effects on prokaryotic cells, such as, for instance, filamentation and aggregation in bacteria. Here we studied the effect of UVR on microcolony formation in two freshwater Synechococcus strains of different ribotypes group B and group I and phycobiliprotein compositions phycoerythrin PE and phycocyanin PC . Each strain was photoacclimated at two light intensities, low light LL 10 mu mol m 2 s 1 and moderate light ML 100 mu mol m 2 s 1 . The cultures were exposed for 6 days to treatments with UVR or without UVR. PE rich Synechococcus acclimated to LL had a low carotenoid/chlorophyll a car/chl ratio but responded faster to UVR treatment, producing the highest percentages of microcolonies and of cells in microcolonies. Conversely, the same strain acclimated to ML, with a higher car/chl ratio, did not aggregate significantly. These results suggest that microcolony formation by PE rich Synechococcus is induced by UVR if carotenoid levels are low. PC rich Synechococcus formed a very low percentage of microcolonies in both acclimations even with low car/chl ratio. The different responses of the two Synechococcus strains to UVR depend on their pigment compositions. On the other hand, this study does not exclude that UVR induced microcolony formation could also be related to specific ribotypes 77 ID_PUMA r.ise/2011 A0 015 Microcolony Formation by Single Cell Synechococcus Strains Microcolony_Formation_by_Single_Cell_Synechococcus_Strains.pdf Articolo in rivista American Society for Microbiology. 0099 2240 Applied and environmental microbiology Print Applied and environmental microbiology Print Appl. environ. microbiol. Print Applied and environmental microbiology. Print roberto.bertoni BERTONI ROBERTO cristiana.callieri CALLIERI CRISTIANA andrea.lami LAMI ANDREA TA.P04.016.004 Ecologia teorica e applicata degli ecosistemi acquatici |