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Pathogenicity and aggressiveness in populations of Pseudomonas syringae from Belgian fruit orchards

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Gilbert, Valerie Planchon, Viviane Legros, Frederique Maraite, Henri [UCL] Bultreys, Alain

The pathogenicity of 99 Belgian Pseudomonas syringae strains representative of the genetic diversity encountered in Belgian fruit orchards was evaluated by using 17 pathogenicity tests conducted on pear, cherry, plum, lilac, sugar beet and wheat. The P. syringae pv. morsprunorum strains were pathogenic to stone fruit species but the race 1 strains possessing the cfl gene involved in coronatine production were pathogenic in more tests than those lacking the gene. Also, sweet cherry twigs were a better material to detect pathogenic strains of race 1 and sour cherry twigs of race 2, which accorded with race 2 presence in sour cherry orchards in Belgium. Three groups were defined in the pv. syringae based on pathogenicity. One group pathogenic in 71.1% of the tests and to lilac included toxic lipodesipeptide-producing (TLP+) strains. The second group pathogenic in 26.8% of the tests and non-pathogenic to lilac included TLP+ strains. The thirth group pathogenic in 9.1% of the tests and almost specifically pathogenic to pear included TLP- strains. The three groups were genetically heterogeneous. Although strain-host relationships were noted within the pv. syringae, aptata and atrofaciens when considering the strain origins, such relationships were not found in the pathogenicity tests, suggesting that pathogenicity tests could probably not reproduce all the aspects of the host-pathogen interactions. None of the pathogenicity tests was able to provide all the information provided by the complete study. A test on pear buds indicated that strains different from the pv. syringae were pathogenic to pear.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2010
Language Anglais
Journal information "European Journal of Plant Pathology" - Vol. 126, no. 2, p. 263-277 (2010)
Peer reviewed yes
Publisher Springer (Dordrecht)
issn 0929-1873
e-issn 1573-8469
Publication status Publié
Affiliation UCL
Keywords Pseudomonas syringae ; Diversity ; Pathogenicity ; Pear ; Cherry ; Plum
Links
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Bibliographic reference Gilbert, Valerie ; Planchon, Viviane ; Legros, Frederique ; Maraite, Henri ; Bultreys, Alain. Pathogenicity and aggressiveness in populations of Pseudomonas syringae from Belgian fruit orchards. In: European Journal of Plant Pathology, Vol. 126, no. 2, p. 263-277 (2010)
Permanent URL http://hdl.handle.net/2078.1/34293