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VARIATION IN THE OCCURRENCE OF EXTERNAL CARBONIC ANHYDRASE AMONG STRAINS OF THE MARINE DIATOM PHAEODACTYLUM TRICORNUTUM (BACILLARIOPHYCEAE) 1
Author(s) -
JohnMcKay Meryl E.,
Colman Brian
Publication year - 1997
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.0022-3646.1997.00988.x
Subject(s) - phaeodactylum tricornutum , biology , carbonic anhydrase , diatom , total inorganic carbon , biochemistry , carbon dioxide , botany , nuclear chemistry , enzyme , ecology , chemistry
Eleven different strains of Phaeodactylum tricornutum Bohlin were obtained from three culture collections and were examined for the presence of external and internal carbonic anhydrase (CA). Cells of all strains, grown in standing culture at alkaline pH and low, dissolved inorganic carbon had internal CA, but only eight were found to have external CA. External CA activity was reduced when cultures were bubbled with air and was completely repressed when they were grown on 5% CO 2 . Expression of external CA activity appears to be regulated by CO 2 concentration in the growth medium, but within one species, there appears to be a variation in occurrence of external CA and consequently in the mode of inorganic carbon acquisition.