Increased CO2 enhances nitrogen fixation and growth in the marine cyanobacterium Trichodesmium IMS101

0099276 - MBÚ 2008 RIV CZ eng C - Conference Paper (international conference)
Levitan, O. - Prášil, Ondřej - Berman-Frank, I.
Increased CO2 enhances nitrogen fixation and growth in the marine cyanobacterium Trichodesmium IMS101.
[Zvýšená koncentrace CO2 zvýší fixaci dusíku a růst mořské sinice Trichodesmium IMS101.]
Aquafluo - Chlorophyll Fluorescence in Aquatic Sciences Meeting. Nové Hrady: Springer, 2007, s. 54-54.
[Aquafluo - Chlorophyll Fluorescence in Aquatic Sciences Meeting. Nové Hrady (CZ), 28.05.2007-01.06.2007]
Institutional research plan: CEZ:AV0Z50200510
Keywords : nirogen fixation * global change * trichodesmium
Subject RIV: EE - Microbiology, Virology

Anthropogenic increases in atmospheric pCO2 over the last century are accompanied by higher concentrations of CO2 (aq) in the surface oceans. These changes could influence aquatic primary production including cyanobacterial nitrogen-fixers via the coupling between photosynthesis and nitrogen-fixation. We hypothesized that elevated pCO2 levels may enhance nitrogen fixation and photosynthesis in the bloom-forming, diazotrophic, cyanobacterium Trichodesmium spp. that contributes greatly to primary production in the oligotrophic subtropical and tropical oceans. We acclimated cultures of Trichodesmium IMS101 to 3 pCO2s (pre-industrial -250 ppmv, current - 400, future -900 ppmv) and examined changes in morphology, photosynthesis, nitrogen fixation, and growth. High pCO2 enhanced growth, filament length and nitrogen fixation of Trichodesmium in comparison with both ambient and low pCO2 acclimated cultures

Antropogenní zvýšení atmosférického CO2 může ovlivnit i mořské diazotrofní sinice, které fixují atmosferický uhlík. Ukázali jsme, že zvýšení CO2 má pozitivní vliv na rychlost růstu a fixace dusíku u sinice Trichodesmium. Pravděpodobným mechanismem je alokace energie a reduktantů od mechanismů koncentrace uhlíku v buňkách k mechanismům fixace dusíku
Permanent Link: http://hdl.handle.net/11104/0157940