Growth, N2 fixation and photosynthesis in a cyanobacterium, Trichodesmium sp., under Fe stress.
Trichodesmium sp., isolated from the Great Barrier Reef lagoon, was cultured in artificial seawater media containing a range of Fe concentration. Fe additions stimulated growth, N2 fixation, cellular chlorophyll a content, light-saturated chlorophyll a-specific gross photosynthetic capacity (Pmchl a) and the dark respiration rate (Rdchl a). Cell yields only doubled for 9 nM Fe relative to zero added Fe, whereas N2 fixation increased 11-fold considerably for 450 nM Fe. The results suggest that N2 fixation of Trichodesmium is more sensitive to Fe limitation than are the cell yields.
Fu
Fei-xue
FX
Department of Chemical Engineering, University of Queensland, Brisbane Qld 4072, Australia. Tracyfu@cheque.uq.edu.au
Bell
P R
PR
D002478:Cells, Cultured; D002734:Chlorophyll / Q000378:metabolism; D000077194:Chlorophyll A; D003116:Color; D000458:Cyanobacteria / Q000187:drug effects* / Q000254:growth & development / Q000502:physiology* / Q000528:radiation effects; D003624:Darkness; D004305:Dose-Response Relationship, Drug; D007501:Iron / Q000494:pharmacology*; D008027:Light; D009584:Nitrogen / Q000378:metabolism; D009586:Nitrogen Fixation / Q000187:drug effects* / Q000502:physiology; D010100:Oxygen / Q000378:metabolism; D010788:Photosynthesis / Q000187:drug effects* / Q000502:physiology; D012623:Seawater
D002734:Chlorophyll; D007501:Iron; D009584:Nitrogen; D010100:Oxygen; D000077194:Chlorophyll A