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KMID : 0368419930360040321
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Journal of Plant Biology
1993 Volume.36 No. 4 p.321 ~ p.326
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Calcium lon Effect on the Sugar-H^+-Cotransport System in Chlorella vulgaris
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Abstract
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Sugar uptake is accompanied with H^+ -substrate-symport generally. Both H^+ /sugar-and H^+/K^+ stoichiometries during the sugar-uptake have been reported to be exactly 1 : 1. This paper reports that the stoichiometries were enhanced dramatically by the addition of CaCl_2 into the medium and by the high cell density of 200 ㎕ pc/mL. The concentration of free Ca^2+ ions in the cells increased significantly with cell densiy. It is suggested that the free Ca^2+ ions are responsible for the change of stoichiometry of sugar transport system by regulation of H^+ ion level of biomembrane.
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