Multilocus sequence analysis of xanthomonads causing bacterial spot of tomato and pepper plants reveals strains generated by recombination among species and recent global spread of Xanthomonas gardneri

Timilsina Sujan, Jibrin Mustafa O., Potnis Neha, Minsavage Gerald V., Kebede Misrak, Schwartz Allison, Bart Rebecca, Staskawicz Brian, Boyer Claudine, Vallad Gary E., Pruvost Olivier, Jones Jeffrey R., Goss Erica. 2015. Multilocus sequence analysis of xanthomonads causing bacterial spot of tomato and pepper plants reveals strains generated by recombination among species and recent global spread of Xanthomonas gardneri. Applied and Environmental Microbiology, 81 (4) : 1520-1529.

https://doi.org/10.1128/AEM.03000-14

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Quartile : Q1, Sujet : BIOTECHNOLOGY & APPLIED MICROBIOLOGY / Quartile : Q2, Sujet : MICROBIOLOGY

Résumé : Four Xanthomonas species are known to cause bacterial spot of tomato and pepper, but the global distribution and genetic diversity of these species are not well understood. A collection of bacterial spot-causing strains from the Americas, Africa, Southeast Asia, and New Zealand were characterized for genetic diversity and phylogenetic relationships using multilocus sequence analysis of six housekeeping genes. By examining strains from different continents, we found unexpected phylogeographic patterns, including the global distribution of a single multilocus haplotype of X. gardneri, possible regional differentiation in X. vesicatoria, and high species diversity on tomato in Africa. In addition, we found evidence of multiple recombination events between X. euvesicatoria and X. perforans. Our results indicate that there have been shifts in the species composition of bacterial spot pathogen populations due to the global spread of dominant genotypes and that recombination between species has generated genetic diversity in these populations.

Mots-clés Agrovoc : Xanthomonas, Xanthomonas campestris vesicatoria, Xanthomonas campestris, distribution géographique, variation génétique, séquence nucléotidique, génome, phylogénie, génétique des populations, recombinaison, mutation, provenance, pathotype, génotype