HISTOCHEMICAL-STUDY ON THE INCOMPATIBILIT Y OF MICROGRAFTING AND GREEN GRAFTING OF GRAPEVINES

In attempt to have a better knowledge of graft incompatibility in grap evine and to develop an early characterization technique, a histochemi cal and histoenzymological analysis of the union zone has been perform ed on in vitro micrografts and on green grafts of compatible and incom patible combinations. Anatomical studies showed that vascular connecti ons were absolutely necessary but not sufficient for the success of th e graft. The abnormal starch distribution allows incompatibility chara cterization but only after its morphological manifestation. Our histoe nzymological study shows that peroxydase activity should not be used a nd generalized for rapid characterization of incompatibility.