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• W2087432963 abstract "Sixteen intertidal macroalga species from the Gibraltar Strait (Southern Spain) have been examined for both their external carbonic anhydrase activity (CA; 4.2.1.1.) and their affinity for inorganic carbon (Ci). Information on the ability to use HCO3− was obtained by measuring the effect of increasing seawater pH on the photosynthesis and by examining the O2 evolution curves vs. Ci concentration. The species exhibited a range of characteristics of Ci utilisation: the green macroalgae were saturated at seawater Ci concentration with Km ranging from 250.0 to 493.3 mmol m−3 and the photosynthetic O2 production, expressed as conductance for CO2 ranging from 432.8 to 16.1×10−6 m s−1. Only three out of the eleven tested red and brown macroalgae were saturated at Ci concentration of seawater and for these algae HCO3− use was clearly indicated by the high initial slope of the O2 evolution rate vs. Ci curve. The most efficient HCO3− users were species from the high intertidal habitats and rockpools. Two methods were used to infer the presence of external CA: standard method (direct enzyme assay) and use of acetazolamide (AZ), a non-permeant inhibitor of CA, in assays of photosynthetic rate. Some discrepancies between the two methods were found and we obtained indications that the use of AZ could be a more sensitive method to detect external CA. It so, we suggest that external CA might be present in all the macroalgae examined. There appeared to be no correlation between the ability to use HCO3− and the presence of external CA. Therefore, the presence of external CA was not a strong indication for an efficient use of HCO3−, although some dependence between the requirement for external CA and habitats was found." @default.
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• W2087432963 date "1998-03-01" @default.
• W2087432963 modified "2023-10-14" @default.
• W2087432963 title "External carbonic anhydrase and affinity for inorganic carbon in intertidal macroalgae" @default.
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• W2087432963 doi "https://doi.org/10.1016/s0022-0981(97)00127-5" @default.
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