The Effect of D-Glucose and Other Sugars on the Trans-root Potential ofZea Mays

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Abstract
The addition of D-glucose and certain other sugars to the bathing solutions of young excised maize roots (Zea mays L., var. Pioneer) gives rise to rapid changes in the electrical potential difference between the bathing solution and the xylem fluid. The results suggest the presence of a fairly non-specific sugar transport system in the plasma membranes of the root epidermal cells in which the hydroxyl group in the I-carbon position of n-glucose is cntically involved. D-Mannose, 2-deoxy-D-glucose, and 2-deoxy-D-galactose have a delayed but more profound effect on this potential, reducing it to a much smaller value. The subsequent addition of adequate amounts of D-glucose restores this potential to about its former value, suggesting that these three compounds interfere with the supply of endogenous glucose or glucose-derived products within the root.

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