RESUMEN
Bacterial spot caused by Xanthomonas spp. is an economically important disease of pepper causing significant yield losses in Taiwan. Monitoring the pathogen population on a continuous basis is necessary for developing disease management strategies. We analyzed a collection of xanthomonad strains isolated from pepper in Taiwan between 1989 and 2019. Among the sequenced genomes, 65 were identified as Xanthomonas euvesicatoria, and 10 were X. perforans. Thirty-five X. euvesicatoria and 10 X. perforans strains were copper tolerant, whereas only four X. euvesicatoria and none of the X. perforans strains were tolerant to streptomycin. Nine X. euvesicatoria strains were amylolytic, which is considered an unusual characteristic for X. euvesicatoria. Bayesian analysis of the population structure based on core gene single-nucleotide polymorphisms clustered the strains into five clusters for X. euvesicatoria and three clusters for X. perforans. One X. perforans cluster, designated as TP-2019, appears to be a novel genetic cluster based on core genes, accessory gene content, and effector profile. This knowledge of pathogen diversity with whole genomic information will be useful in future comparative studies and in improving breeding programs to develop disease-resistant cultivars and other disease management options.
Asunto(s)
Capsicum , Variación Genética , Enfermedades de las Plantas , Xanthomonas , Taiwán , Capsicum/microbiología , Xanthomonas/genética , Xanthomonas/aislamiento & purificación , Enfermedades de las Plantas/microbiología , Fenotipo , Filogenia , Teorema de Bayes , Genoma Bacteriano/genética , Polimorfismo de Nucleótido Simple/genéticaRESUMEN
The pathogen that causes stem gall in Loropetalum chinense was first identified in Florida and Alabama in 2018 and named Pseudomonas amygdali pv. loropetali. We report the genome sequence of the pathotype strain of this pathogen, Pseudomonas amygdali pv. loropetali DSM105780 PT.