Comparison of models describing light dependence of N(2) fixation in heterocystous cyanobacteria

The abilities of four models to describe nitrogenase light-response curves were compared, using the heterocystous cyanobacterium Nodularia spumigena and a cyanobacterial bloom from the Baltic Sea as examples. All tested models gave a good fit of the data, and the rectangular hyperbola model is recom...

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Bibliographic Details
Published in:Applied and environmental microbiology 2002-09, Vol.68 (9), p.4679-4683
Main Authors: Staal, Marc, te Lintel Hekkert, Sacco, Herman, Peter, Stal, Lucas J
Format: Article
Language:English
Subjects:
Cyanobacteria - enzymology
Cyanobacteria - metabolism
Light
Models, Biological
Nitrogen Fixation
Nitrogenase - metabolism
Photosynthesis
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Summary:The abilities of four models to describe nitrogenase light-response curves were compared, using the heterocystous cyanobacterium Nodularia spumigena and a cyanobacterial bloom from the Baltic Sea as examples. All tested models gave a good fit of the data, and the rectangular hyperbola model is recommended for fitting nitrogenase-light response curves. This model describes an enzymatic process, while the others are empirical. It was possible to convert the process parameters between the four models and compare N(2) fixation with photosynthesis. The physiological meanings of the process parameters are discussed and compared to those of photosynthesis.
ISSN:0099-2240