The activity and isozymic patterns of the peroxidase (POX), polyphenol oxidase (PPO) and superoxide disrnutase (SOD) extracted from stem xylem in the nodes which were not the same degree of development of thre e-yead-old 'Kyoho' grape seedlings were analyzed by using the discontinuous system of poly acrylamid gel electrophorsis. It was shoown that a specific band on the electrophoretogram of POX from stem segments increased in activity from the stem base up to the first-tendril position and then disappeared. During the rest period, no difference in enzyme patterns between development stages wa...
