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Molecular assessment of phosphorus and iron physiology in Trichodesmium populations from the western Central and western South Atlantic
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DOI：10.4319/lo.2007.52.5.2221.png)
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Abstract
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Trichodesmium is capable of responding to low phosphorus ( P) and low iron ( Fe) concentrations through the induction of alkaline phosphatase ( AP) activity ( an enzyme that hydrolyzes inorganic phosphate from phosphomonoesters) and the IdiA protein ( an iron deficiency protein that putatively binds iron), respectively. We monitored AP activity and IdiA expression as molecular diagnostics of P and Fe stress in Trichodesmium field samples on a transect from the western central to the western South Atlantic and compared the expression of these markers with physical, chemical, and N-2 fixation measurements. Trichodesmium AP activity was detected at many stations, whereas IdiA expression was not. Incubation additions of inorganic P at one station resulted in a loss of AP activity and an increase in N-2 fixation. Our data suggest that P, and not Fe, is the constraining factor limiting Trichodesmium N-2 fixation along most of the transect. These results support previous modeling efforts predicting that diazotrophs in this region are P-stressed and further validate the use of molecular diagnostics of nutritional physiology, in concert with more traditional approaches, for identifying constraints on marine N-2 fixation.
Keywords:
NITROGEN-FIXATION
NORTH-ATLANTIC
CYANOBACTERIUM TRICHODESMIUM
EQUATORIAL ATLANTIC
CONTINUOUS CULTURES
SPP.
DYNAMICS
BOUNDARY
STRESS
N-2
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