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Annals of Botany 72: 547-550, 1993
© 1993 Annals of Botany Company

Cytochemical Localization of Hydrogen Peroxide in Lignifying Cell Walls

Y. Czaninski, R. M. Sachot and A. M. Catesson

Ecole Normale Supérieure et Université P. et M. Curie, Laboratoire des Biomembranes et Surfaces Cellulaires Végétales, 46 rue d'Ulm, 75230 Paris cedex 05, France

The presence of endogenous H2O2 was demonstrated at the electron microscope level with the CeCl3 technique in lignifying cell walls of poplar. Reaction product was precisely located in the very same walls which could oxidize hydrogen donors in the absence of exogeneous H2O2. As evidenced by these results, peroxidases are truly involved in the polymerisation of lignin monomers even if other oxidases may participate in this biosynthetic pathway.Copyright 1993, 1999 Academic Press

Cytochemistry, hydrogen peroxide, lignification, peroxidase, polyphenoloxidase, Populus x euramericana, poplar


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