Acclimation of chlorophyll a and carotenoid levels to different irradiances in four freshwater cyanobacteria

Schagerl, Michael; Müller, Brigitte

doi:10.1016/j.jplph.2005.09.015

Cited by 87 publications

(45 citation statements)

References 32 publications

(45 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In Microcystis, zeaxanthin is known to be involved in the dissipation mechanism to eliminate energy excess from the antenna (19), giving Microcystis the ability to survive near the lake surface during blooms. Also, in different species of Anabaena, zeaxanthin accumulated slowly during longer periods of high light exposure, for energy dissipation (36). In marine Synechococcus, the cellular content of zeaxanthin was found to be relatively constant at different light irradiances (23,30).…”

Section: Discussionmentioning

confidence: 99%

Microcolony Formation by Single-Cell Synechococcus Strains as a Fast Response to UV Radiation

Callieri

Lami

Bertoni

2011

Appl Environ Microbiol

View full text Add to dashboard Cite

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 ). 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.

show abstract

Section: Discussionmentioning

confidence: 99%

Microcolony Formation by Single-Cell Synechococcus Strains as a Fast Response to UV Radiation

Callieri

Lami

Bertoni

2011

Appl Environ Microbiol

View full text Add to dashboard Cite

show abstract

“…level of which is considered symptomatic of exposure to high light stress (10,23,34,35), was ca. 3-fold higher, relative to the WT, for cultures of the ⌬pgl1ϩ2 mutant grown under an irradiance of only 20 microeinsteins ⅐ m Ϫ2 ⅐ s Ϫ1 (Fig.…”

Section: Discussionmentioning

confidence: 99%

Inactivation of Genes Encoding Plastoglobulin-Like Proteins in Synechocystis sp. PCC 6803 Leads to a Light-Sensitive Phenotype

et al. 2010

View full text Add to dashboard Cite

Plastoglobulins (PGL) are the predominant proteins of lipid globules in the plastids of flowering plants. Genes encoding proteins similar to plant PGL are also present in algae and cyanobacteria but in no other organisms, suggesting an important role for these proteins in oxygenic photosynthesis. To gain an understanding of the core and fundamental function of PGL, the two genes that encode PGL-like polypeptides in the cyanobacterium Synechocystis sp. PCC 6803 (pgl1 and pgl2) were inactivated individually and in combination. The resulting mutants were able to grow under photoautotrophic conditions, dividing at rates that were comparable to that of the wild-type (WT) under low-light (LL) conditions (10 microeinsteins ⅐ m ؊2 ⅐ s ؊1 ) but lower than that of the WT under moderately high-irradiance (HL) conditions (150 microeinsteins ⅐ m ؊2 ⅐ s ؊1 ). Under HL, each ⌬pgl mutant had less chlorophyll, a lower photosystem I (PSI)/PSII ratio, more carotenoid per unit of chlorophyll, and very much more myxoxanthophyll (a carotenoid symptomatic of high light stress) per unit of chlorophyll than the WT. Large, heterogeneous inclusion bodies were observed in cells of mutants inactivated in pgl2 or both pgl2 and pgl1 under both LL and HL conditions. The mutant inactivated in both pgl genes was especially sensitive to the light environment, with alterations in pigmentation, heterogeneous inclusion bodies, and a lower PSI/PSII ratio than the WT even for cultures grown under LL conditions. The WT cultures grown under HL contained 2-to 3-fold more PGL1 and PGL2 per cell than cultures grown under LL conditions. These and other observations led us to conclude that the PGL-like polypeptides of Synechocystis play similar but not identical roles in some process relevant to the repair of photooxidative damage.

show abstract

“…Anabaenopsis elenkinii produced high amounts of myxoxanthophyll and β-carotene. Interestingly, Anabaena cylindrica hardly showed any variation in carotenoid content under different irradiances (Schagerl & Muller 2006 ), its quantity is reduced and the cells are green (see Rech et al 2008, Fig. 6).…”

Section: Pigment Ratiosmentioning

confidence: 95%

“…Based on Kehoe & Gutu (2006) harvest wavelengths such as green light that are poorly absorbed by chlorophylls, and efficiently transfer excitation energy to the chlorophyll molecules in reaction centers. Other carotenoids such as β-carotene and astaxanthine show the opposite relation to irradiance, since they function as photoprotective light filters (Krinsky 1989, Fan et al 1995, Choudhury & Behera 2001, Wang et al 2003, Schagerl & Muller 2006, with concentrations increasing under high light. These carotenoids act by quenching free radicals, and converting excess light energy into heat.…”

Section: Pigment Ratiosmentioning

confidence: 99%

Photoacclimation processes in phytoplankton: mechanisms, consequences, and applications

Dubinsky¹,

Stambler²

2009

Aquat. Microb. Ecol.

213

164

View full text Add to dashboard Cite

Acclimation of chlorophyll a and carotenoid levels to different irradiances in four freshwater cyanobacteria

Cited by 87 publications

References 32 publications

Microcolony Formation by Single-Cell Synechococcus Strains as a Fast Response to UV Radiation

Microcolony Formation by Single-Cell Synechococcus Strains as a Fast Response to UV Radiation

Inactivation of Genes Encoding Plastoglobulin-Like Proteins in Synechocystis sp. PCC 6803 Leads to a Light-Sensitive Phenotype

Photoacclimation processes in phytoplankton: mechanisms, consequences, and applications

Contact Info

Product

Resources

About