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Function of polyphenol oxidase in higher plants
Author(s) -
Vaughn Kevin C.,
Duke Stephen O.
Publication year - 1984
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1984.tb04258.x
Subject(s) - thylakoid , plastid , chloroplast , polyphenol oxidase , biochemistry , enzyme , photophosphorylation , biology , amyloplast , peroxidase , gene
Recent evidence has supported the folllowing views: 1. Polyphenol oxidase (PPO) is a plastidic enzyme that is unclear‐coded, but is inactive until incorporated into the plastid. 2. In healthy green tissues PPO exists in a latent form on the thylakoid membrane and is not involved in synthesis of phenolic compounds. In leucoplasts, proplastids, or amyloplasts PPO is often present in a latent form in rudimentary thylakoids. 3. PPO normally functions as a phenol oxidase in vivo only in sencent or damaged cells. 4. In the functional chloroplast, PPO may be involved in some aspect of oxygen chemistry – pherhaps mediation of pseudocyclic photophosphorylation.