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Polyphenol Oxidases in Crops: Biochemical, Physiological and Genetic Aspects
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Polyphenol Oxidases in Crops: Biochemical, Physiological and Genetic Aspects
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Journal Article
Polyphenol Oxidases in Crops: Biochemical, Physiological and Genetic Aspects
2017
Overview
Enzymatic browning is a colour reaction occurring in plants, including cereals, fruit and horticultural crops, due to oxidation during postharvest processing and storage. This has a negative impact on the colour, flavour, nutritional properties and shelf life of food products. Browning is usually caused by polyphenol oxidases (PPOs), following cell damage caused by senescence, wounding and the attack of pests and pathogens. Several studies indicated that PPOs play a role in plant immunity, and emerging evidence suggested that PPOs might also be involved in other physiological processes. Genomic investigations ultimately led to the isolation of PPO homologs in several crops, which will be possibly characterized at the functional level in the near future. Here, focusing on the botanic families of Poaceae and Solanaceae, we provide an overview on available scientific literature on PPOs, resulting in useful information on biochemical, physiological and genetic aspects.
Publisher
MDPI AG,MDPI
