Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 104, Issue 28, Pages 11772-11777Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0700574104
Keywords
appressorium; pathogen; plant disease; superoxide; virulence
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One of the first responses of plants to microbial attack is the production of extracellular superoxide surrounding infection sites. Here, we report that Magnaporthe grisea, the causal agent of rice blast disease, undergoes an oxidative burst of its own during plant infection, which is associated with its development of specialized infection structures called appressoria. Scavenging of these oxygen radicals significantly delayed the development of appressoria and altered their morphology. We targeted two superoxide-generating NADPH oxidase-encoding genes, Nox1 and Nox2, and demonstrated genetically, that each is independently required for pathogenicity of M. grisea. Delta nox1 and Delta nox2 mutants are incapable of causing plant disease because of an inability to bring about appressorium-mediated cuticle penetration. The initiation of rice blast disease therefore requires production of superoxide by the invading pathogen.
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