The effect of auxins (IAA and 4-Cl-IAA) on the redox activity and medium pH ofZea maysL. root segments

✍ Scribed by Halina Lekacz; Waldemar Karcz

• Book ID: 111490322
• Publisher: SP Versita
• Year: 2006
• Tongue: English
• Weight: 610 KB
• Volume: 11
• Category: Article
• ISSN: 1425-8153
• DOI: 10.2478/s11658-006-0031-5

✦ Synopsis

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.