New insights into the role of indole-3-acetic acid in the virulence of Pseudomonas savastanoi pv. savastanoi
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Otros documentos de la autoría: Aragón, Isabel M.; Pérez-Martínez, Isabel; Moreno-Pérez, Alba; Cerezo García, Miguel; Ramos, Cayo
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http://dx.doi.org/10.1111/1574-6968.12413 |
Metadatos
Título
New insights into the role of indole-3-acetic acid in the virulence of Pseudomonas savastanoi pv. savastanoiAutoría
Fecha de publicación
2014Editor
Wiley Online LibraryISSN
0378-1097Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://onlinelibrary.wiley.com/doi/10.1111/1574-6968.12413/abstractPalabras clave / Materias
Resumen
Indole-3-acetic acid (IAA) is a widespread phytohormone among plant-associated bacteria, including the tumour-inducing pathogen of woody hosts, Pseudomonas savastanoi pv. savastanoi. A phylogenetic analysis of the ... [+]
Indole-3-acetic acid (IAA) is a widespread phytohormone among plant-associated bacteria, including the tumour-inducing pathogen of woody hosts, Pseudomonas savastanoi pv. savastanoi. A phylogenetic analysis of the iaaM/iaaH operon, which is involved in the biosynthesis of IAA, showed that one of the two operons encoded by Pseudomonas savastanoi pv. savastanoi NCPPB 3335, iaaM-1/iaaH-1, is horizontally transferred among bacteria belonging to the Pseudomonas syringae complex. We also show that biosynthesis of the phytohormone, virulence and full fitness of this olive pathogen depend only on the functionality of the iaaM-1/iaaH-1 operon. In contrast, the iaaM-2/iaaH-2 operon, which carries a 22-nt insertion in the iaaM-2 gene, does not contribute to the production of IAA by this bacterium. A residual amount of IAA was detected in the culture supernatants of a double mutant affected in both iaaM/iaaH operons, suggesting that a different pathway might also contribute to the total pool of the phytohormone produced by this pathogen. Additionally, we show that exogenously added IAA negatively and positively regulates the expression of genes related to the type III and type VI secretion systems, respectively. Together, these results suggest a role of IAA as a signalling molecule in this pathogen. [-]
Publicado en
FEMS microbiology letters, 2014, vol. 356, nº 2, p. 184-192.Derechos de acceso
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info:eu-repo/semantics/restrictedAccess
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