Department of Botany, Duke University, Durham, North Carolina 27706.
Plant Physiol. 1979 Oct;64(4):611-4. doi: 10.1104/pp.64.4.611.
Reports of the effects of abscisic acid (ABA) on ion and water fluxes have been contradictory. Some of the confusion seems due to the interaction of ion and water transport across membranes. In these experiments root systems were subjected to hydrostatic pressures up to 5.0 bars to enable measurement of root conductance that was independent of measurement of osmotic potentials or ion fluxes.ABA between 5 x 10(-5) molar and 2 x 10(-4) molar resulted in a decrease in the conductance of the soybean root systems as compared with the controls. ABA treatment also eliminated the discontinuity in the Arrhenius plot of total flow versus reciprocal temperature at constant pressure. The results suggest that ABA acts at the membrane that is rate-limiting to water flow directly, or by altering metabolism that in turn affects the membrane.
关于脱落酸(ABA)对离子和水流的影响的报告一直存在矛盾。一些混淆似乎是由于跨膜的离子和水运输的相互作用造成的。在这些实验中,根系受到高达 5.0 巴的静水压力,以能够测量与测量渗透压或离子通量无关的根系电导。与对照相比,浓度为 5×10(-5)摩尔至 2×10(-4)摩尔的 ABA 导致大豆根系的电导降低。ABA 处理还消除了在恒压下总流量与倒数温度的阿累尼乌斯图的不连续性。结果表明,ABA 直接作用于限制水流的膜上,或者通过改变代谢进而影响膜。