Centrum Algatech

Mikrobiologický ústav AV ČR, v.v.i. - vědecké pracoviště Třeboň

Laboratoř fotosyntézy 

Diazotrophic cyanobacteria under elevated CO2

Ondřej Prášil

We have been studying the response of diazotrophic cyanobacteria to expected increases in pCO2 (900 ppm expected in 2100). The first study [1] indicated that Trichodesmium might double its growth rate and nitrogen fixation under elevated CO2. The follow-up studies [2,3] analysed in detail the underlying molecular mechanisms. We have shown that it is the re-allocation of cellular resources from CO2 concentrating mechanisms to nitrogen fixation that allows Trichodesmium to increase its overall productivity. In addition, we have also studied the differences in CO2 response among cyanobacteria with different strategies of regulation of photosynthesis and nitrogen fixation - namely Anabaena and Cyanothece.

The project is supported by grant GACR 206/08/1683

RESULTS:
  1. Kranz, S.A., Levitan, O., Richter, K-U., Prášil, O., Berman-Frank, I., Rost, B.: Combined effect of COand light on the N–fixing cyanobacterium Trichodesmium IMS101: Physiological Responses. – Plant Physiology 154, 334-345, 2010.
  2. Levitan, O., Kranz, S.A., Spungin, D., Prášil, O., Rost, B., Berman-Frank, I.: Combined effect of COand light on the N–fixing cyanobacterium Trichodesmium IMS101: A mechanistic view. – Plant Physiology 154, 346-356, 2010.
  3. Levitan, O., Rosenberg, G., Šetlík, I., Šetlíková, E., Grígel, J-. Klepetář, J., Prášil, O., Berman-Frank, I. (2007) Elevated CO2 enhances nitrogen fixation and growth in the marine cyanobacterium Trichodesmium. - Global Change Biology 13, 1-8.

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