MÉTABOLISME AUXINIQUE ET RHIZOGÉNÈSE.
II. ACTIVITÉS AUXINES-OXYDASIQUE, PEROXYDASIQUE PHÉNOLOXYDASIQUE ET NAPHTOLOXYDASIQUE CHEZ IMPATIENS BALSAMINA L.
Laboratoire de Phytochimie de l’Université de Liège et Centre de Recherches des Hormones végétales (I.R.S.I.A.).
Abstract
Extracts of Impatiens balsamina L. have been purified by acetone precipitation.
Purified extracts showing IAA-oxidase activity with DCP and hydrogen peroxide exhibit peroxidase activity on gaiacol and on several peroxidase substrates.
They show no polyphenoloxidase activity.
It seems highly probable that a specific enzyme is responsible for the oxidation of hydroxynaphtalenic compounds.
In leaf tissues, peroxidase and IAA-oxidase activities do not run parallel during incubation time, but only when inhibitors are present, and are therefore considered to be one enzyme system. A possible interpretation of the results is that inhibitors are able to form complexes with the enzyme.