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(Received for publication, June 9, 1997, and in revised form, June 25, 1997)
From the Nitrogen Fixation Laboratory, John Innes Centre, Norwich,
NR4 7UH, United Kingdom
This communication describes the interactions of
salicylic acid (SA) with plant ascorbate peroxidase (APX). Contrary to
a recent report (Durner, J., and Klessig, D. F. (1995) Proc.
Natl. Acad. Sci. U. S. A. 92, 11312-11316) we show
conclusively that ascorbate oxidation by APX is not inhibited by SA (10 mM), but that SA is a slow reducing substrate of this
enzyme. The suggestion that SA-dependent inhibition of APX
in planta may result in the elevation of
H2O2 levels, which in turn acts as a second
messenger in systemic acquired resistance signaling, is therefore not
tenable. We conclude that APX remains a key antioxidant during systemic acquired resistance following pathogenic infection of plants. The
transient products of SA oxidation by APX appear to be SA free radicals
that undergo subsequent chemistry. APX-dependent oxidation
of SA could be essential for diminishing the detrimental effects of
this phenolic acid on plant cells.
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