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Dynamic changes in enzyme activities and phenolic content during in vitro rooting of tree peony (Paeonia suffruticosa Andr.) plantlets

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Author(s): Songlin He

Journal: Maejo International Journal of Science and Technology
ISSN 1905-7873

Volume: 5;
Issue: 02;
Start page: 252;
Date: 2011;
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Keywords: tree peony | Paeonia suffruticosa | rooting | enzyme activities | phenolic content | dynamic changes

ABSTRACT
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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