The effect of auxins (IAA and 4-Cl-IAA) on the redox activity and medium pH of Zea mays L. root segments |
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Authors: | Halina Lekacz Waldemar Karcz |
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Institution: | (1) Faculty of Biology, Department of Plant Physiology, University of Silesia, ul. Jagiellońska 28, 40-032 Katowice, Poland |
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Abstract: | Indole-3-acetic acid (IAA) and 4-chloroindole-3-acetic acid (4-Cl-IAA) were tested at different concentrations and times for
their capacity to change the redox activity and medium pH of maize root segments. The dose-response surfaces (dose-response
curves as a function of time) plotted for redox activity and changes in medium pH (expressed as ΔpH) had a similar shape for
both auxins, but differed significantly at the optimal concentrations. With 4-Cl-IAA, the maximal values of redox activity
and medium pH changes were observed at 10−10 M, which was a 100-fold lower concentration than with IAA. Correlations were observed between redox activity and medium pH
changes at the optimal concentrations of both IAA and 4-Cl-IAA. The results are discussed herein, taking into account both
the concentration of the auxins and the effects produced by them. |
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Keywords: | Redox activity Medium pH changes Root segments Zea mays L Auxins Dose-response surface |
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