Waksman Institute and Department of Molecular Biology and Biochemistry, Rutgers—The State University of New Jersey, 190 Frelinghuysen Road, Piscataway 08854-8020, U.S.A.
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Accepted 2 September 2000.
We used a variety of nitric oxide (NO) donors to demonstrate that NO inhibits the activities of tobacco catalase and ascorbate peroxidase (APX). This inhibition appears to be reversible because removal of the NO donor led to a significant recovery of enzymatic activity. In contrast, APX and catalase were irreversibly inhibited by peroxynitrite. The ability of NO and peroxynitrite to inhibit the two major H2O2-scavenging enzymes in plant cells suggests that NO may participate in redox signaling during the activation of defense responses following pathogen attack.
© 2000 The American Phytopathological Society