title: Mechanisms of inorganic carbon acquisition in two estuarine Rhodophyceans: Bostrychia scorpioides (Hudson) ex Kützing Montagne and Catenella caespitosa (Withering) L. M. Irvine.
abstract: Marine macroalgae possess a range of mechanisms to increase the availability of CO2 for fixation by ribulose-1,5-bisphosphate carboxylase/oxygenase. Of these, possession of a periplasmic or external carbonic anhydrase and the ability to use bicarbonate ions is widely distributed. The mechanisms of carbon acquisition were studied in two estuarine red macroalgae Bostrychia scorpioides and Catenella caespitosa using a range of techniques. pH-drift and CO2-depletion experiments at constant pH suggested that CO2 is the main source of inorganic carbon in both species. Inhibitors indicated that internal and external carbonic anhydrase were present in both species. Inhibitors also suggested that uptake of bicarbonate is unlikely to be present (P < 0.05).
authors.affiliation: Departamento de Ecología, Universidad de Málaga, Bulevar de Louis Pasteur s/n, 29010, Málaga, Spain, mruiznieto@uma.es.
authors.forename: Miriam
authors.initials: M
authors.lastname: Ruiz-Nieto
authors.forename: José A
authors.initials: JA
authors.lastname: Fernández
authors.forename: F Xavier
authors.initials: FX
authors.lastname: Niell
authors.forename: Raquel
authors.initials: R
authors.lastname: Carmona
mesh_terms: D002244:Carbon / Q000378:metabolism*; D002245:Carbon Dioxide / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D012273:Ribulose-Bisphosphate Carboxylase / Q000378:metabolism
chemical_list: D002245:Carbon Dioxide; D002244:Carbon; D012273:Ribulose-Bisphosphate Carboxylase
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