Loss of a callose synthase results in salicylic acid-dependent disease resistance.
Science
; 301(5635): 969-72, 2003 Aug 15.
Article
em En
| MEDLINE
| ID: mdl-12920300
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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Base de dados:
MEDLINE
Assunto principal:
Doenças das Plantas
/
Ascomicetos
/
Arabidopsis
/
Ácido Salicílico
/
Proteínas de Schizosaccharomyces pombe
/
Glucosiltransferases
/
Proteínas de Membrana
Idioma:
En
Ano de publicação:
2003
Tipo de documento:
Article