Combined Effects of CO2 and Light on the N-2-Fixing Cyanobacterium Trichodesmium IMS101: A Mechanistic View

0352855 - MBÚ 2011 RIV US eng J - Journal Article
Levitan, O. - Kranz, S. A. - Spungin, D. - Prášil, Ondřej - Rost, B. - Berman-Frank, I.
Combined Effects of CO2 and Light on the N-2-Fixing Cyanobacterium Trichodesmium IMS101: A Mechanistic View.
Plant Physiology. Roč. 154, č. 1 (2010), s. 346-356. ISSN 0032-0889. E-ISSN 1532-2548
R&D Projects: GA ČR GA206/08/1683
Institutional research plan: CEZ:AV0Z50200510
Keywords : cyanobacterium Trichodesmium * ocean * photosystem I
Subject RIV: EE - Microbiology, Virology
Impact factor: 6.451, year: 2010

We examined the combined influence of pCO2 and light on Trichodesmium IMS101. We investigated changes in the photosynthetic fluorescence parameters of photosystem II, in ratios of the photosynthetic units (photosystem I:photosystem II), and in the pool sizes of key proteins involved in the fixation of carbon and nitrogen as well as their subsequent assimilation. We show that the combined elevation in pCO2 and light controlled the operation of the CO2-concentrating mechanism and enhanced protein activity without increasing their pool size. Moreover, elevated pCO2 and high light decreased the amounts of several key proteins (NifH, PsbA, and PsaC), while amounts of AtpB and RbcL did not significantly change. Reduced investment in protein biosynthesis, without notably changing photosynthetic fluxes, could free up energy that can be reallocated to increase N2 fixation and growth at elevated pCO2 and light
Permanent Link: http://hdl.handle.net/11104/0192260