The effect of auxins (IAA and 4-Cl-IAA) on the redox activity and medium pH of Zea mays L. root segments.
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 DeltapH) 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.
Lekacz
Halina
H
Faculty of Biology, Department of Plant Physiology, University of Silesia, Katowice, Poland. hlekacz@us.edu.pl
Karcz
Waldemar
W
D006863:Hydrogen-Ion Concentration / Q000187:drug effects; D007210:Indoleacetic Acids / Q000494:pharmacology*; D010084:Oxidation-Reduction / Q000187:drug effects; D018517:Plant Roots / Q000187:drug effects* / Q000378:metabolism*; D013997:Time Factors; D003313:Zea mays / Q000187:drug effects* / Q000378:metabolism*
D007210:Indoleacetic Acids; C096198:4-chloroindole-3-acetic acid