| Summary: | The dynamic changes of phenolic content and peroxidase (POD), polyphenol oxidase (PPO), indole-3-acetic acid oxidase (IAAO) and phenylalanine ammonia lyase (PAL) activities were assessed during the in vitro rooting process of three cultivars of tree peony (Paeonia suffruticosa Andr.). These changes in enzyme-related activity and phenolic content__observed at the level of the whole plant__differed during the first 20 days of the rooting process in easy-to-root ‘Feng Dan Bai’ cultivar and difficult-to-root ‘Wu Long Peng Sheng’ and ‘Tai Ping Hong’ cultivars, and in most cases they were actually opposite. The ease with which ‘Feng Dan Bai’ was able to root was closely related to the activity of all four enzymes (POD, PPO, IAAO, PAL) as well as to the phenolic content.
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