Glucose excretion by the symbiotic Chlorella of Spongilla fluviatilis |
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Authors: | Andrea Fischer Doris Meindl Eckhard Loos |
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Institution: | (1) Lehrstuhl für Zellbiologie und Pflanzenphysiologie, Universität Regensburg, Universitätsstrasse 31, D-8400 Regensburg, Federal Republic of Germany |
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Abstract: | Chlorella sorokiniana strain 211-40c, a symbiotic Chlorella isolated from a freshwater sponge, excreted between 3% and 5% of assimilated 14CO2 as glucose in the light, with a pH optimum around 5. This percentage increased when the illuminance was lowered (to 15% at 20 lx). Release of 14C]glucose continued in the dark and could be inhibited by the uncoupler carbonyl cyanide p-trifluoromethoxyphenylhydrazone (FCCP). Net efflux of glucose occurred even at a concentration ratio of extracellular/intracellular glucose of 4. This, together with the sensitivity to FCCP, is taken as evidence for active transport. Exogenous 14C]glucose was taken up by the cells under conditions of net glucose efflux, showing uptake and excretion to take place simultaneously.Abbreviations FCCP
carbonyl cyanide p-trifluoromethoxyphenylhydrazone
- p.c.
packed cells |
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Keywords: | Chlorella (symbiosis) Glucose excretion (Chlorella symbiosis) Symbiosis |
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