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Sucrose is the predominant form of photosynthetically reduced carbon transported in most plant species. In the experiments reported here, an active, proton-coupled sucrose transport system has been idenfffied and partially characterized in plasmalemma vesicles Isolated from mature sugar beet (Beta vulgarls L. cv Great Westem) leaves. The isolated vesicles concentrated sucrose fivefold In the presence of an imposed pH gradient (basic interior). The presence of carbonyl cyanidedoi:10.1104/pp.89.4.1318 pmid:16666703 pmcid:PMC1056015 fatcat:xpsh2ipexbcnxakbwgeu75qqbi