Descripción
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Pseudomonas syringae strains deliver diverse type III effector proteins into host cells, where they can act as virulence factors. Although the functions of the majority of type IIIeffectors are unknown, several have been shown to interferewith plant basal defense mechanisms. Type III effectorsalso could contribute to bacterial virulence by enhancingnutrient uptake and pathogen adaptation to the environmentof the host plant. We demonstrate that the type IIIeffector HopAM1 (formerly known as AvrPpiB) enhancesthe virulence of a weak pathogen in plants that are grownunder drought stress. This is the first report of a type IIIeffector that aids pathogen adaptation to water availabilityin the host plant. Expression of HopAM1 makes transgenicWs-0 Arabidopsis hypersensitive to abscisic acid (ABA) forstomatal closure and germination arrest. Conditional expressionof HopAM1 in Arabidopsis also suppresses basaldefenses. ABA responses overlap with defense responsesand ABA has been shown to suppress defense against P. syringaepathogens. We propose that HopAM1 aids P. syringaevirulence by manipulation of ABA responses that suppressdefense responses. In addition, host ABA responses enhancedby type III delivery of HopAM1 protect developingbacterial colonies inside leaves from osmotic stress. | |
Internacional
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Si |
JCR del ISI
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Si |
Título de la revista
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MOLECULAR PLANT-MICROBE INTERACTIONS |
ISSN
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0894-0282 |
Factor de impacto JCR
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4,275 |
Información de impacto
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Volumen
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21 |
DOI
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Número de revista
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3 |
Desde la página
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361 |
Hasta la página
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370 |
Mes
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MARZO |
Ranking
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