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Iron limitation in the marine cyanobacterium Trichodesmium reveals new insights into regulation of photosynthesis and nitrogen fixation

Iron limitation in the marine cyanobacterium Trichodesmium reveals new insights into regulation of photosynthesis and nitrogen fixation

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KÜPPER, Hendrik, Ivan ETLÍK, Sven SEIBERT, Ondřej PRÁ IL, Eva ETLÍKOVÁ, Martina STRITTMATTER, Orly LEVITAN, Jens LOHSCHEIDER, Iwona ADAMSKA, Ilana BERMAN-FRANK, 2008. Iron limitation in the marine cyanobacterium Trichodesmium reveals new insights into regulation of photosynthesis and nitrogen fixation. In: New Phytologist. 179(3), pp. 784-798. ISSN 0028-646X. eISSN 1469-8137

@article{Kupper2008limit-1268, title={Iron limitation in the marine cyanobacterium Trichodesmium reveals new insights into regulation of photosynthesis and nitrogen fixation}, year={2008}, number={3}, volume={179}, issn={0028-646X}, journal={New Phytologist}, pages={784--798}, author={Küpper, Hendrik and etlík, Ivan and Seibert, Sven and Prá il, Ondřej and etlíková, Eva and Strittmatter, Martina and Levitan, Orly and Lohscheider, Jens and Adamska, Iwona and Berman-Frank, Ilana} }

Strittmatter, Martina Lohscheider, Jens 2011-03-23T09:07:32Z Adamska, Iwona As iron (Fe) deficiency is a main limiting factor of ocean productivity, its effects were investigated on interactions between photosynthesis and nitrogen fixation in the marine nonheterocystous diazotrophic cyanobacterium Trichodesmium IMS101. Biophysical methods such as fluorescence kinetic microscopy, fast repetition rate (FRR) fluorimetry, and in vivo and in vitro spectroscopy of pigment composition were used, and nitrogenase activity and the abundance of key proteins were measured.<br />Fe limitation caused a fast down-regulation of nitrogenase activity and protein levels. By contrast, the abundance of Fe-requiring photosystem I (PSI) components remained constant. Total levels of phycobiliproteins remained unchanged according to single-cell in vivo spectra. However, the regular 16-kDa phycoerythrin band decreased and finally disappeared 16 20 d after initiation of Fe limitation, concomitant with the accumulation of a 20-kDa protein cross-reacting with the phycoerythrin antibody. Concurrently, nitrogenase expression and activity increased. Fe limitation dampened the daily cycle of photosystem II (PSII) activity characteristic of diazotrophic Trichodesmium cells. Further, it increased the number and prolonged the time period of occurrence of cells with elevated basic fluorescence (F0). Additionally, it increased the effective cross-section of PSII, probably as a result of enhanced coupling of phycobilisomes to PSII, and led to up-regulation of the Fe stress protein IsiA.<br />Trichodesmium survives short-term Fe limitation by selectively down-regulating nitrogen fixation while maintaining but re-arranging the photosynthetic apparatus. Seibert, Sven Lohscheider, Jens Prá il, Ondřej deposit-license Iron limitation in the marine cyanobacterium Trichodesmium reveals new insights into regulation of photosynthesis and nitrogen fixation Küpper, Hendrik 2008 etlík, Ivan etlíková, Eva Adamska, Iwona 2011-03-23T09:07:32Z Levitan, Orly Berman-Frank, Ilana eng etlíková, Eva Levitan, Orly Prá il, Ondřej Strittmatter, Martina etlík, Ivan Küpper, Hendrik Seibert, Sven Berman-Frank, Ilana Publ. in: New Phytologist 179 (2008), 3, pp. 784-798

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