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Abscisic Acid Raises the Permeability of Plant Cells to Water

1971; Oxford University Press; Volume: 48; Issue: 1 Linguagem: Inglês

10.1104/pp.48.1.103

1532-2548

Z. Glinka, Leonora Reinhold,

Plant nutrient uptake and metabolism

A number of recent observations have indicated a role for ab- scisic acid in maintaining water balance.Treatment with ABA re- duces the transpiration rate (3,5), probably by bringing about stomatal closure (2, 4).Furthermore, water stress leads to a sig- nificant increase in ABA concentration in leaves (5, 7).On the other hand, ABA increases the rate of root exudation (6).The present communication reports a marked effect of ABA on the permeability of plant tissues to water.The effect is observable both on Lp, the coefficient of hydraulic conductivity, and on Pd, the coefficient of diffusional permeability to water.The effect on hydraulic conductivity was detected in experi- ments in which osmotic water flux between cells and medium was followed with time.The equations for net osmotic flux into or