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Photosynthetic and growth response of freshwater picocyanobacteria are strain-specific and sensitive to photoacclimation.

Moser M, Callieri C, Weisse T - J. Plankton Res. (2008)

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: Institute for Limnology of the Austrian Academy of Sciences , Mondseestr. 9, A-5310 Mondsee , Austria.

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 mumol photons m(-2) s(-1) with cultures that were acclimated to low (10 mumol photons m(-2) s(-1)) and moderate (100 mumol 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.

No MeSH data available.


Related in: MedlinePlus

Growth rates versus irradiance of picocyanobacterial strains MW4C3 (a), MW100C3 (b) and BO8801 (c), after photoacclimation to low light conditions (LL, 10 µmol photons m−2 s−1).
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FBN123F3: Growth rates versus irradiance of picocyanobacterial strains MW4C3 (a), MW100C3 (b) and BO8801 (c), after photoacclimation to low light conditions (LL, 10 µmol photons m−2 s−1).

Mentions: The growth response to light of the LL cultures of all three strains differed widely (Fig. 3). The highest growth rates (µmax), 0.40 day−1, were measured for the green strain BO8801 at 70 µmol photons m−2 s−1 (Fig. 3c and Table I). This isolate showed the clearest, unimodal pattern in its µ versus light response (Fig. 3c); µ of all three strains was negative at the highest two light intensities (Fig. 3a–c). Strain-specific differences in the growth response to light were more pronounced in the ML cultures (Fig. 4). Strain MW100C3 showed high µ, ranging from 0.66–0.90 day−1, over all light intensities except at the two lowest ones (Fig. 4b). Growth rates of the red strain MW4C3 were generally low (<0.1 day−1) and negative at the two highest and the two lowest light intensities (Fig. 4a). The green strain BO8801 (Fig. 4c) showed similar growth rates in the ML and LL cultures (0.40 ± 0.05 day−1, Table I). A shift in positive and maximum µ towards higher light intensities was observed in the other two ML cultures, relative to the respective LL cultures (Figs. 3a and b, 4a and b, and Table I).


Photosynthetic and growth response of freshwater picocyanobacteria are strain-specific and sensitive to photoacclimation.

Moser M, Callieri C, Weisse T - J. Plankton Res. (2008)

Growth rates versus irradiance of picocyanobacterial strains MW4C3 (a), MW100C3 (b) and BO8801 (c), after photoacclimation to low light conditions (LL, 10 µmol photons m−2 s−1).
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2651037&req=5

FBN123F3: Growth rates versus irradiance of picocyanobacterial strains MW4C3 (a), MW100C3 (b) and BO8801 (c), after photoacclimation to low light conditions (LL, 10 µmol photons m−2 s−1).
Mentions: The growth response to light of the LL cultures of all three strains differed widely (Fig. 3). The highest growth rates (µmax), 0.40 day−1, were measured for the green strain BO8801 at 70 µmol photons m−2 s−1 (Fig. 3c and Table I). This isolate showed the clearest, unimodal pattern in its µ versus light response (Fig. 3c); µ of all three strains was negative at the highest two light intensities (Fig. 3a–c). Strain-specific differences in the growth response to light were more pronounced in the ML cultures (Fig. 4). Strain MW100C3 showed high µ, ranging from 0.66–0.90 day−1, over all light intensities except at the two lowest ones (Fig. 4b). Growth rates of the red strain MW4C3 were generally low (<0.1 day−1) and negative at the two highest and the two lowest light intensities (Fig. 4a). The green strain BO8801 (Fig. 4c) showed similar growth rates in the ML and LL cultures (0.40 ± 0.05 day−1, Table I). A shift in positive and maximum µ towards higher light intensities was observed in the other two ML cultures, relative to the respective LL cultures (Figs. 3a and b, 4a and b, and Table I).

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: Institute for Limnology of the Austrian Academy of Sciences , Mondseestr. 9, A-5310 Mondsee , Austria.

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 mumol photons m(-2) s(-1) with cultures that were acclimated to low (10 mumol photons m(-2) s(-1)) and moderate (100 mumol 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.

No MeSH data available.


Related in: MedlinePlus