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- W2097788453 abstract "ABSTRACT This study examines phenolic peroxidase (POX) in Rhizophora mangle L. leaves in order to assess its role in phenolic manipulation and H 2 O 2 scavenging. Sun‐exposed and understorey leaves experiencing varying degrees of nutrient stress were analysed from an oligotrophic cay off the coast of Belize. POX activity was unaffected by growth environment, but increased throughout leaf development and persisted through senescence and after abscission. Histochemical analyses indicated POX activity throughout leaf tissues, especially in the apoplast. Phenolics were similarly broadly distributed. Two isoenzymes of POX were partially characterized with pIs of 4.1 and 6.3 and masses of 65.5 and 54.3 kDa, respectively. The larger, more acidic isoenzyme showed especially high heat stability, showing no reduced activity after 24 h at 60 °C. Rhizophora mangle POX oxidized quercetin preferentially, and, to a lesser extent, coniferyl alcohol, caffeic acid, chlorogenic acid, and p ‐coumaric acid. It did not oxidize ascorbate, but ascorbate could act as a secondary electron donor in the presence of a phenolic substrate and H 2 O 2 . However, because quercetin and other aglycones were not present in R. mangle leaves, and because POX showed no activity with the most abundant leaf flavonoid, rutin, it was concluded that detoxification of H 2 O 2 is secondary to the other roles of POX in manipulation of phenolics." @default.
- W2097788453 created "2016-06-24" @default.
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- W2097788453 date "2005-02-04" @default.
- W2097788453 modified "2023-10-11" @default.
- W2097788453 title "Biochemical and ecological characterization of two peroxidase isoenzymes from the mangrove, Rhizophora mangle" @default.
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- W2097788453 doi "https://doi.org/10.1111/j.1365-3040.2005.01307.x" @default.
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