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Histological aspects of a hypersensitive response in Poplar to Melampsora larici-populina Inra
Laurans, F.; Pilate, G..
The course of the infection and development of the biotrophic fungus Melampsora larici-populina on leaf tissue from the hybrid poplar Populus deltoides × P. nigra ‘Ogy’ was monitored at the histological level. Leaf disks were inoculated with one of two rust physiological races (E1 and E2), resulting in interactions that were either incompatible (race E1) or compatible (race E2). In the compatible interaction, the fungus rapidly colonized the leaf without inducing any apparent host response. Symptoms appeared on the leaf several days after inoculation just prior to spore dissemination. The incompatible interaction was characterized by the early collapse and disorganization of cytoplasm of infected cells 17 h after inoculation and within 2 h after the...
Tipo: Journal Article Palavras-chave: PEUPLIER HYBRIDE; RESISTANCE A LA ROUILLE; REPONSE HYPERSENSIBLE; RACE PHYSIOLOGIQUE; ANALYSE HISTOLOGIQUE HYBRID POPLAR; RUST RESISTANCE; HYPERSENSITIVE RESPONSE; PHYSIOLOGICAL RACE; HISTOLOGICAL ANALYSIS.
Ano: 1999 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20109a00378b&uri=/notices/prodinra1/2011/02/
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Naturally occurring nonpathogenic isolates of the plant pathogen species Pseudomonas syringae lack a type III secretion system and effector gene orthologues Inra
Mohr, T.J.; Liu, H.; Yan, S.; Morris, C.E.; Castillo, J.A.; Jelenska, J.; Vinatzer, B.A..
Pseudomonas syringae causes plant diseases, and the main virulence mechanism is a type III secretion system (T3SS) that translocates dozens of effector proteins into plant cells. Here we report the existence of a subgroup of P. syringae isolates that do not cause disease on any plant species tested. This group is monophyletic and most likely evolved from a pathogenic P. syringae ancestor through loss of the T3SS. In the nonpathogenic isolate P. syringae 508 the genomic region that in pathogenic P. syringae strains contains the hrp-hrc cluster coding for the T3SS and flanking effector genes is absent. P. syringae 508 was also surveyed for the presence of effector orthologues from the closely related pathogenic strain P. syringae pv. syringae B728a, but none...
Tipo: Journal Article Palavras-chave: PROGRAMMED CELL-DEATH; EXCHANGEABLE EFFECTOR; ESCHERICHIA-COLI; HYPERSENSITIVE RESPONSE; MICROBE INTERACTIONS; PROTEIN SECRETION; GENOME SEQUENCE; INNATE IMMUNITY; EFFECTOR PROTEINS; VIRULENCE.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200850ea0c3b&uri=/notices/prodinra1/2008/06/
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Transcript Profiling of Poplar Leaves upon Infection with Compatible and Incompatible Strains of the Foliar Rust Melampsora larici-populina Inra
Rinaldi, C.; Kohler, A.; Frey, P.; Duchaussoy, F; Ningre, F; Couloux, A.; Wincker, P; Le Thiec, D.; Fluch, S.; Martin, F.; Duplessis, S..
To understand key processes governing defense mechanisms in poplar (Populus spp.) upon infection with the rust fungus Melampsora larici-populina, we used combined histological and molecular techniques to describe the infection of Populus trichocarpa X Populus deltoides 'Beaupre' leaves by compatible and incompatible fungal strains. Striking differences in host-tissue infection were observed after 48-h postinoculation (hpi) between compatible and incompatible interactions. No reactive oxygen species production could be detected at infection sites, while a strong accumulation of monolignols occurred in the incompatible interaction after 48 hpi, indicating a late plant response once the fungus already penetrated host cells to form haustorial infection...
Tipo: Journal Article Palavras-chave: OBLIGATE BIOTROPHIC PATHOGEN; EXPRESSED SEQUENCE TAGS; FOR-GENE SPECIFICITY; HYPERSENSITIVE RESPONSE; HYBRID POPLAR; DISEASE RESISTANCE; LEAF RUST; FLAX RUST; AVIRULENCE GENES; GENOMIC SEQUENCE.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20072887511d&uri=/notices/prodinra1/2011/04/
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