Sucrose uptake by sugar beet tap root tissue |
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| Authors: | Wyse R |
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| Affiliation: | United States Department of Agriculture, Science and Education Administration, Agricultural Research, Crops Research Lab, UMC 63, Utah State University, Logan, Utah 84322. |
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| Abstract: | Sucrose uptake by discs of mature sugar beet root tissue incubated in [14C]-sucrose exhibited nonsaturating kinetics over the concentration range of 1 to 500 millimolar. Uptake was inhibited by dinitrophenol, sodium cyanide, low O2, and penetrating sulfhydryl inhibitors. ATPase inhibitors, sodium fluoride, and oligomycin reduced uptake by 20 and 40%, respectively. Uptake as asymmetrically labeled sucrose ([14C]glucose) occurred with approximately 80% retention of asymmetry, indicating a nonhydrolytic pathway. Uptake was against a concentration gradient and required metabolic energy. |
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