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  • 1
    Electronic Resource
    Electronic Resource
    Growth distribution and surface pH patterns along maize roots (1983)
    Springer
    Planta 158 (1983), S. 398-402 
    Details
    ISSN: 1432-2048
    Keywords: Elongation gradient ; Growth (root) ; pH patterns ; Proton efflux ; Root (growth, surface pH) ; Zea (root growth)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The distribution of elongation and surface pH patterns along the primary roots of maize (cv. LG 11), maintained vertically in humid air (darkness, 22°C), have been analysed quantitatively. A new technique employing Sephadex G 25 beads containing a pH indicator dye (bromocresol purple), was used for measuring both the growth gradient of the roots (Sephadex beads as markers) and at the same time, the surface pH changes (referring to a standard scale). The optimal axial growth was located between 2 and 4 mm from the tip. This coincides with the optimal decrease in surface pH.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397731
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  • 2
    Electronic Resource
    Electronic Resource
    Transmembrane electrical potentials in growing maize roots (1982)
    Springer
    Planta 156 (1982), S. 407-412 
    Details
    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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    Paper (German National Licenses)
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