ISSN:
1432-2048
Keywords:
Antiauxin effect
;
Auxin and transmembrane potential
;
Electric potential, transmembrane
;
Growth (root)
;
Membrane potential
;
Zea (root, potential)
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The anti-auxin 4-chlorophenoxyisobutyric acid (PCIB) applied at a concentration of 10-2 mol m-3 to maize root segments was found to induce a transmembrane electrical potential of up to-130 mV (Δpd of 30 mV). The kinetics of this response were comparable to the time scale for PCIB-stimulated H+-extrusion. Both effects are eliminated by the addition of p-fluoromethoxycarbonyl cyanide phenylhydrazone (FCCP). Treatment with fusicoccin (FC) and PCIB together does not result in a hyperpolarization greater than with FC alone. Benzoic acid (10-2 mol m-3) had no effect on the transmembrane electrical potentials. These results are discussed in relation to a possible electrogenic proton pump which may be regulated by perturbations in the cellular auxin content or activity.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00393311
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