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Ca‐Cd interaction in the prymnesiophyte Cricosphaera elongata
Author(s) -
KAREZ C. S.,
ALLEMAND D.,
RENZIS G.,
GNASSIABARELLI M.,
ROMEO M.,
PUISEUXDAO S.
Publication year - 1990
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.1990.tb01326.x
Subject(s) - verapamil , cadmium , calcium , biophysics , labelling , chemistry , diffusion , biology , biochemistry , physics , organic chemistry , thermodynamics
. 45 Ca and 109 Cd uptake were followed in Criscosphaera elongata Prymnesiophyceae. In both cases, after a rapid increase for the first 5 min, the incorporation rate slowed during the hour of observation. Verapamil, a blocker of voltage‐dependent slow calcium channels, inhibited 45 Ca uptake except during the first rapid phase when adsorption should predominate. Cadmium also decreased 45 Ca labelling, suggesting that the two metals are antagonistic. However, verapamil was shown to augment 109 Cd incorporation, contrary to what occurs in animals cells; this effect is detectable in continuous labelling as well as in pulse experiments. The data support the presence of calcium channels in the alga and suggest several processes in Cd accumulation: adsorption on peripheral envelopes and diffusion of uncharged Cd.