Affiliation:
1. Department of Plant Biology, Carnegie Institution, Stanford, CA 94305, USA.
2. Department of Biological Sciences, Western Illinois University, Macomb, IL 61455, USA.
Abstract
Plants attacked by pathogens rapidly deposit callose, a β-1,3-glucan, at wound sites. Traditionally, this deposition is thought to reinforce the cell wall and is regarded as a defense response. Surprisingly, here we found that
powdery mildew resistant 4
(
pmr4
), a mutant lacking pathogen-induced callose, became resistant to pathogens, rather than more susceptible. This resistance was due to mutation of a callose synthase, resulting in a loss of the induced callose response. Double-mutant analysis indicated that blocking the salicylic acid (SA) defense signaling pathway was sufficient to restore susceptibility to
pmr4
mutants. Thus, callose or callose synthase negatively regulates the SA pathway.
Publisher
American Association for the Advancement of Science (AAAS)
Cited by
563 articles.
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