Abstract
Summary The uptake and metabolism of sorbitol in tissue of the immature apple were studied. The rate of sorbitol absorption by discs of tissue was found to correlate positively with the rate of conversion of sorbitol to fructose, the sugar which accumulates in the apple during growth. Sorbitol uptake showed saturation kinetics and was not influenced by changes in external pH. Other sugars and sugar derivatives (glucose, fructose, sucrose, sorbose, mannitol, myo-inositol, xylitol, ribitol, 2-desoxy-D-glucose, and 3-O-methylglucose) had no effect on initial sorbitol uptake. However, absorption of sorbitol was inhibited following pre-incubation of discs of tissue with these sugars. From these results it is inferred that sorbitol uptake into the storage compartment of cells of the apple is maintained by a carrier-mediated transport system probably located at the tonoplast.
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