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Annals of Botany 82: 97-103, 1998
© 1998 Annals of Botany Company

Hydrogen Peroxide Production is a General Property of the Lignifying Xylem from Vascular Plants

A. ROS BARCELÓ

Department of Plant Biology (Plant Physiology), University of Murcia, E-30100, Murcia, Spain

January 12, 1998 ; February 20, 1998 . April 8, 1998 .

Production of hydrogen peroxide (H2O2) by the lignifying xylem of several vascular plants has been studied using a new histochemical method based on the H2O2-dependent oxidation of 3,5,3'5'-tetramethylbenzidine (TMB) catalysed by cell wall peroxidases. This method allows H2O2to be determined in the range of 5–100 µM, where other methods, such as the KI/starch reagent, fail. With this method, it has been possible to determine H2O2production in the lignifying xylem of a wide range of vascular plants (gymnosperms and angiosperms). The capability of xylem tissues of sustaining H2O2production lends support to the hypothesis that cinnamyl alcohol polymerization in xylem vessels is caused by an H2O2-dependent oxidative coupling process.Copyright 1998 Annals of Botany Company

H2O2generation, lignification, peroxidase, tetramethylbenzidine, xylem.


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