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Abstract

In the present study the effect of rare earth element Praseodymium (Pr) on flavonoids production and its biosynthesis key enzymes including Peroxidase (POD; EC 1.11.1.7), Polyphenol oxidase (PPO; EC 1.10.3.1) and Phenylanlanine ammonialyase (PAL; EC 4.3.1.5) in hairy roots of Scutellaria viscidula was investigated. After 7 days of suspension culture, activity of POD, PPO and PAL and total flavonoid production showed the same response tendency, which was ascending first and then descending with the Pr3+ elicitor increasing, and the Pr(NO3)3 concentration reaching the knee point was 15

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