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1 CIRAD, UMR Peuplement végétaux et Bioagresseurs en Milieu Tropical CIRAD/Université de la Réunion, Ligne Paradis, 97410 Saint Pierre, Réunion Island, France
2 UMR de Pathologie Végétale, INRA, Station de Pathologie Végétale, 42 rue Georges Morel, BP 57, 49071 Beaucouzé Cedex, France
3 Department of Plant Pathology, University of Florida, PO Box 110680, Gainesville, FL 32611-0680, USA
4 UMR 385 ENSAM-INRA-CIRAD, Biologie et Génétique des Interactions Plante–Parasite, Avenue Agropolis, 34398 Montpellier Cedex 5, France
Correspondence
Olivier Pruvost
olivier.pruvost{at}cirad.fr
Bacterial blight is an emerging disease that affects primarily onion, but also garlic and Welsh onion. The present study was undertaken to characterize the causative xanthomonad(s) by a polyphasic approach using a worldwide collection of 33 bacterial strains. Analysis of 16S rRNA gene sequence similarities indicated that the causal agent belongs to the campestris core in the genus Xanthomonas, which is in agreement with results of phenotypic characterization (analyses of carbon source utilization and fatty acid methyl esters). However, DNA–DNA hybridization, thermal stability of DNA reassociation and fluorescent amplified fragment length polymorphism analysis allowed the causal agent to be identified as a pathovar of Xanthomonas axonopodis.
Published online ahead of print on 27 June 2003 as DOI 10.1099/ijs.0.02714-0.
The GenBank accession number for the partial 16S rDNA sequence of Xanthomonas axonopodis pv. allii CFBP 6369 is AY135649.
Primer/adaptor sequences, a dendrogram based on FAME analysis, Biolog results and correspondence analysis and a fuller version of Fig. 1 are available as supplementary material in IJSEM Online.
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