Loss of a callose synthase results in salicylic acid-dependent disease resistance |
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Authors: | Nishimura Marc T Stein Monica Hou Bi-Huei Vogel John P Edwards Herb Somerville Shauna C |
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Affiliation: | Department of Plant Biology, Carnegie Institution, Stanford, CA 94305, USA. |
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Abstract: | Plants attacked by pathogens rapidly deposit callose, a beta-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. |
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