Effect of Abscisic Acid on Root Hydraulic Conductivity | Zendy

Albert H. Markhart | Zendy; Edwin L. Fiscus | Zendy; Aubrey W. Naylor | Zendy; Paul J. Kramer | Zendy

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Effect of Abscisic Acid on Root Hydraulic Conductivity

Author(s) -

Albert H. Markhart,

Edwin L. Fiscus,

Aubrey W. Naylor,

Paul J. Kramer

Publication year - 1979

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.64.4.611

Subject(s) - abscisic acid , hydraulic conductivity , root (linguistics) , conductivity , chemistry , botany , biology , environmental science , soil science , biochemistry , philosophy , soil water , gene , linguistics

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.

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