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• W1964155371 abstract "Polyphenol oxidase (PPO) catalyses the oxidation of monophenols and/or o-diphenols to o-quinones with the concomitant reduction of oxygen to water which results in protein complexing and the formation of brown melanin pigments. The most frequently suggested role for PPO in plants has been in defence against herbivores and pathogens, based on the physical separation of the chloroplast-localized enzyme from the vacuole-localized substrates. The o-quinone-protein complexes, formed as a consequence of cell damage, may reduce the nutritional value of the tissue and thereby reduce predation but can also participate in the formation of structural barriers against invading pathogens. However, since a sufficient level of compartmentation-based regulation could be accomplished if PPO was targeted to the cytosol, the benefit derived by some plant species in having PPO present in the chloroplast lumen remains an intriguing question. So is there more to the chloroplastic location of PPO? An interaction between PPO activity and photosynthesis has been proposed on more than one occasion but, to date, evidence either for or against direct involvement has been equivocal, and the lack of identified chloroplastic substrates remains an issue. Similarly, PPO has been suggested to have both pro- and anti-oxidant functions. Nevertheless, several independent lines of evidence suggest that PPO responds to environmental conditions and could be involved in the response of plants to abiotic stress. This review highlights our current understanding of the in vivo functions of PPO and considers the potential opportunities it presents for exploitation to increase stress tolerance in food crops." @default.
• W1964155371 created "2016-06-24" @default.
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• W1964155371 creator A5057763839 @default.
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• W1964155371 date "2015-04-04" @default.
• W1964155371 modified "2023-10-14" @default.
• W1964155371 title "Polyphenol oxidase in leaves: is there any significance to the chloroplastic localization?" @default.
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• W1964155371 doi "https://doi.org/10.1093/jxb/erv141" @default.
• W1964155371 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25873687" @default.
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