Sucrose Uptake and Compartmentation in Sugar Beet Taproot Tissue
Open Access
- 1 May 1983
- journal article
- research article
- Published by Oxford University Press (OUP) in Plant Physiology
- Vol. 72 (1), 1-6
- https://doi.org/10.1104/pp.72.1.1
Abstract
Active sucrose uptake by discs of mature sugar beet (Beta vulgaris L. cv GW-D2 and USH-20) root tissue shows a biphasic dependence on external sucrose. At concentrations up to 20 millimolar sucrose, the active uptake mechanism appears to approach saturation, with an apparent Km of 3.6 millimolar. At higher external sucrose concentrations, a linear dependence becomes obvious indicating the probable presence of a nonsaturable, metabolically dependent uptake component. Active transport was not observed at external sucrose concentrations that caused tissue plasmolysis. Passive sucrose uptake in unplasmolyzed tissue showed a linear dependence on external sucrose concentration. The mitochondrial and/or suspected vacuolar ATPase inhibitors oligomycin, diethylstilbestrol, and N,N-dicyclohexylcarbodiimide strongly inhibited active sucrose uptake, whereas the putative plasmalemma-specific ATPase inhibitor orthovanadate was without effect.This publication has 12 references indexed in Scilit:
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