The effect of 4-chlororesorcinol on the endogenous levels of IAA, ABA and oxidative enzymes in cuttings

Détails

ID Serval
serval:BIB_F39578531915
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
The effect of 4-chlororesorcinol on the endogenous levels of IAA, ABA and oxidative enzymes in cuttings
Périodique
Plant Growth Regulation
Auteur(s)
Ben-Efraim I., Gad A. E., Cohen P., Reymond P., Pilet P. E.
ISSN
0167-6903
Statut éditorial
Publié
Date de publication
1990
Peer-reviewed
Oui
Volume
9
Numéro
2
Pages
97-106
Langue
anglais
Résumé
Treatment of bean cuttings with 4-chlororesorcinol (4-CR), known to increase the number of roots and extend their distribution, prevented the accumulation of free indol-3-yl-acetic acid (IAA) in the hypocotyls within 24 h after cutting preparation. In mung bean there was no change in the distribution (upper half vs. 1 ower half of the hypocotyl) of IAA within the hypocotyl as a result of the treatment. In bean cuttings the treatment with 4-CR prevented the accumulation of IAA in the bottom of the cutting. Oxidation of IAA as a measure of IAA oxidase activity in bean was enhanced appreciably by 4-chlororesorcinol. The level of abscisic acid in mung bean, on the other hand, remained 3-4 fold higher than in the control, yet still about 50% lower than the zero time level. In untreated mung bean cuttings the activity of peroxidase increased after cutting preparation. In contrast, the activity of peroxidase in 4-Cr-treated cuttings was consistently lower. In order to relate to the effect of exogenously applied auxin the level of peroxidase was measured also in indol-3-yl-butyric acid-treated cuttings. The overall peroxidase activity in IBA-treated cuttings was not affected. However, when assaying for the different isozymes the drop in peroxidase activity was most evident in the inducible basic isoperoxidases both in 4-CR and IBA treatments. It appears that the exposure to 4-CR exerts an effect that is similar to that of exogenously applied auxin, affecting the activity of basic peroxidases and enhancing the oxidation of endogenous IAA, thus allowing the organization of the primordia.
Mots-clé
abscisic acid, 4-chlororesorcinol, indol-3-yl-acetic acid, indol-3-yl-butyric acid, peroxidase, rooting
Web of science
Création de la notice
24/01/2008 20:46
Dernière modification de la notice
03/03/2018 22:42
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