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- W1987053008 abstract "Evidence of an inorganic carbon concentrating system in a marine macroalga is provided here. Based on an O2 technique, supported by determinations of inorganic carbon concentrations, of experimental media (as well as compensation points) 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 found that ribulose-1,5-bisphosphate carboxylase/oxygenase from Ulva had a K m(CO2) of 70 micromolar and saturated at about 250 micromolar CO2. Assuming a cytoplasmic pH of 7.2 (as measured for another Ulva species, P Lundberg et al. [1988] Plant Physiol 89: 1380-1387), and given the high activity of internal carbonic anhydrase (S Beer, A Israel [1990] Plant Cell Environ [in press]) and the here measured internal inorganic carbon level, it was concluded that internal CO2 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. It is suggested that this suppresses photorespiration and optimizes net photosynthetic production in an alga representing a large group of marine plants faced with limiting external CO2 concentrations in nature." @default.
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- W1987053008 date "1990-12-01" @default.
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- W1987053008 title "Photosynthesis in <i>Ulva fasciata</i>" @default.
- W1987053008 doi "https://doi.org/10.1104/pp.94.4.1542" @default.
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