Abstract
O2 without accumulating oxidation products of phenolics. Scavenging of H2O2 by the systems can proceed in vacuoles and the apoplast, because phenolics, AA and POX are normal components of the compartments. AA seems to control lignification because it reduces radicals of lignin monomers which are formed by POX-dependent reactions. On lignification, oxidation of sinapyl alcohol is enhanced by radicals of coniferyl alcohol and hydroxycinnamic acid esters when apoplastic POX rapidly oxidizes coniferyl alcohol and the esters but slowly oxidizes sinapyl alcohol. POX seems to participate in the browning of tobacco leaves and onion scales on aging. H2O2, which is required for the POX-dependent reactions, can be formed by autooxidation of the phenolics that are transformed to brown components. It is discussed that browning involves the formation of antimicrobial substances.
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