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Function of polyphenol oxidase in higher plants

1984; Wiley; Volume: 60; Issue: 1 Linguagem: Inglês

10.1111/j.1399-3054.1984.tb04258.x

1399-3054

Kevin C. Vaughn, Stephen O. Duke,

Plant Gene Expression Analysis

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.