Evolution de l'activite auxines-oxydasique et peroxydasique lors de l'induction photoperiodique et de la sexualisation de l'epinard

(Evolution of the auxin-oxidase and peroxidase activity duringthe spinach's photo-periodic induction and sexualisation) Protein extracts, prepared from spinach leaves, are analysedafter a gel chromatography on Sephadex G-100 and SE-SephadexC-50. The photoperiodic induction seems related with a fallof the auxin-oxidase and peroxidase activities we observe achange in the isozyme number and pattern. The female plants have more isozymes, but the enzymatic activityis higher in the male plants. The destruction of the indole-3-acetic acid, in spinach, isnot strictly related to the peroxidases. (Received September 14, 1971; )