Abstract
Peroxidases (EC 1.11.1.7) from Populus x euramericana were investigated during the dormant and growing seasons using histochemical and biochemical methods. The activities of syringaldazine oxidase and p-paraphenylenediamine-pyrocatechol oxidase in sections of branches were maximal during spring in both phloem and young xylem. Cytoplasmic and cell-wall peroxidase activities from different lignified tissues were estimated in vitro. Pronounced differences were noticed between fractions isolated during spring and winter. Gel electrophoresis showed the presence of an anionic fast-migrating isoperoxidase group with a high syringaldazine-oxidase activity. The isoenzymes of this group were different in winter and in spring. The properties of these isoperoxidases (kinetic constants, pH optimum, resistance to heat) were investigated after isolation by ion-exchange chromatography.
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Abbreviations
- PPD-PC:
-
p-phenylenediamine-pyrocatechol
- syr-oxidase:
-
syringaldazine-oxidase
References
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Imberty, A., Goldberg, R. & Catesson, AM. Isolation and characterization of Populus isoperoxidases involved in the last step of lignin formation. Planta 164, 221–226 (1985). https://doi.org/10.1007/BF00396085
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DOI: https://doi.org/10.1007/BF00396085