Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/71851
Title: Role Of Carbonic-Anhydrase In Photosynthesis And Inorganic-Carbon Assimilation In The Red Alga Gracilaria-Tenuistipitata
Authors: Haglund, K
Bjork, M
Ramazanov, Z
García-Reina, Guillermo 
Pedersen, M
UNESCO Clasification: 241707 Algología (ficología)
Keywords: Macroalga Chondrus-Crispus
Chlamydomonas-Reinhardtii
Marine Macroalgae
Bicarbonate Transport
Exogenous Hco3, et al
Issue Date: 1992
Journal: Planta 
Abstract: The mechanism of inorganic-carbon (C(i)) accumulation in the red seaweed Gracilaria tenuistipitata Zhang et Xia has been investigated. Extracellular and intracellular carbonic-anhydrase (CA) activities have been detected. Photosynthetic O2 evolution in thalli and protoplasts of G. tenuistipitata were higher at pH 6.5 than at pH 8.6, where HCO3- is the predominant form of C(i). Dextran-bound sulfonamide (DBS), a specific inhibitor of extracellular CA, reduced photosynthetic O2 evolution at pH 8.6 and did not have any effect at pH 6.5. After inhibition with DBS, O2 evolution was similar to the rate that could be supported by CO2 from spontaneous dehydration of HCO3-. The rate of photosynthetic alkalization of the surrounding medium by the algal thallus was dependent on the concentration of C(i) and inhibited by DBS. We suggest that the general form of C(i) that enters through the plasma membrane of G. tenuistipitata is CO2. Bicarbonate is utilized mainly by an indirect mechanism after dehydration to CO2, and this mechanism involves extracellular CA.
URI: http://hdl.handle.net/10553/71851
ISSN: 0032-0935
DOI: 10.1007/BF00201951
Source: Planta [ISSN 0032-0935], v. 187 (2), p. 275-281, (Mayo 1992)
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