Photosynthesis in Ulva fasciata . 5. Evidence for an inorganic carbon concentrating system, and ribulose-1,5-bisphosphate carboxylase/oxygenase CO sub(2) kinetics

Evidence of an inorganic carbon concentrating system in a marine macroalga is provided here. Based on an O sub(2) technique, supported by determinations of inorganic carbon concentrations, of experimental media using infrared gas analysis, it was found that Ulva fasciata) maintained intracellular in...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1990-01, Vol.94 (4), p.1542-1546
Main Authors: Beer, S, Israel, A, Drechsler, Z, Cohen, Y
Format: Article
Language:English
Subjects:
Marine
Ulva fasciata
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Summary:Evidence of an inorganic carbon concentrating system in a marine macroalga is provided here. Based on an O sub(2) technique, supported by determinations of inorganic carbon concentrations, of experimental media using infrared gas analysis, it was found that Ulva fasciata) maintained intracellular inorganic carbon levels of 2.3 to 6.0 millimolar at bulk medium concentrations ranging from 0.02 to 1.5 millimolar. Bicarbonate seemed to be the preferred carbon form taken up at all inorganic carbon levels. It was concluded that internal CO sub(2) in Ulva) could, at ambient external inorganic carbon concentrations, be maintained at a high enough level to saturate ribulose-1,5-bisphosphate carboxylase/oxygenase carboxylation.
ISSN:0032-0889