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Absorption of Sugars by Plant Tissues

1964; Oxford University Press; Volume: 39; Issue: 1 Linguagem: Inglês

10.1104/pp.39.1.78

1532-2548

B. R. Grant, Harry Beevers,

Sugarcane Cultivation and Processing

There is already evidence that processes other than simple diffusion contribute to the uptake of sugars by some plant cells. For example, the preferential absorption of particular sugars by Scenedesmus (21, 22), Peltigera (12), and tomato roots (8), and the effects of metabolic inhibitors on uptake (5, 11, 15) are well established. Moreover, accumulation against apparent concentration gradients has been shown for sugar cane tissue (4) and the ability of carrot tissues, rich in sugar, to take up all of the glucose from dilute glucose solutions is of interest (9). Nevertheless, on the basis of the present information, it is not possible to draw general conclusions about transport against gradients (15) or to make deductions about the mechanism of transport. In this paper experiments with carrot slices and corn root tips are described in which the abilities of these tissues to absorb different monosaccharides, the effects of other sugars and inhibitors on the absorption process, and the responses to anaerobiosis and temperature were measured. Internal concentrations of entering sugars have been determined to test if active transport against a gradient occurs and some deductions are made about compartmentation of sugars in these 2 tissues.