title: Glucose excretion by the symbiotic Chlorella of Spongilla fluviatilis.
abstract: Chlorella sorokiniana strain 211-40c, a symbiotic Chlorella isolated from a freshwater sponge, excreted between 3% and 5% of assimilated (14)CO2 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 [(14)C]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 [(14)C]glucose was taken up by the cells under conditions of net glucose efflux, showing uptake and excretion to take place simultaneously.
authors.affiliation: Lehrstuhl für Zellbiologie und Pflanzenphysiologie, Universität Regensburg, Universitätsstrasse 31, D-8400, Regensburg, Federal Republic of Germany.
authors.forename: A
authors.initials: A
authors.lastname: Fischer
authors.forename: D
authors.initials: D
authors.lastname: Meindl
authors.forename: E
authors.initials: E
authors.lastname: Loos