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MÉTABOLISME AUXINIQUE ET RHIZOGÉNÈSE.
II. ACTIVITÉS AUXINES-OXYDASIQUE, PEROXYDASIQUE PHÉNOLOXYDASIQUE ET NAPHTOLOXYDASIQUE CHEZ IMPATIENS BALSAMINA L.
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.
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A propos de : M. Bastin
Laboratoire de Phytochimie de l’Université de Liège et Centre de Recherches des Hormones végétales (I.R.S.I.A.).