Genomic acquisitions in emerging populations of Xanthomonas vasicola pv. vasculorum infecting corn in the United States and Argentina

Pérez-Quintero Alvaro L., Ortiz-Castro Mary, Lang Jillian M., Rieux Adrien, Wu Guangxi, Liu Sanzhen, Chapman Toni A., Chang Christine, Ziegle Janet, Peng Zhao, White Frank F., Plazas Maria Cristina, Leach Jan E., Broders Kirk. 2020. Genomic acquisitions in emerging populations of Xanthomonas vasicola pv. vasculorum infecting corn in the United States and Argentina. Phytopathology, 110 (6) : 1161-1173.

Quartile : Q1, Sujet : PLANT SCIENCES

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : Xanthomonas vasicola pv. vasculorum is an emerging bacterial plant pathogen that causes bacterial leaf streak on corn. First described in South Africa in 1949, reports of this pathogen have greatly increased in the past years in South America and in the United States. The rapid spread of this disease in North and South America may be due to more favorable environmental conditions, susceptible hosts and/or genomic changes that favored the spread. To understand whether genetic mechanisms exist behind the recent spread of X. vasicola pv. vasculorum, we used comparative genomics to identify gene acquisitions in X. vasicola pv. vasculorum genomes from the United States and Argentina. We sequenced 41 genomes of X. vasicola pv. vasculorum and the related sorghum-infecting X. vasicola pv. holcicola and performed comparative analyses against all available X. vasicola genomes. Time-measured phylogenetic analyses showed that X. vasicola pv. vasculorum strains from the United States and Argentina are closely related and arose from two introductions to North and South America. Gene content comparisons identified clusters of genes enriched in corn X. vasicola pv. vasculorum that showed evidence of horizontal transfer including one cluster corresponding to a prophage found in all X. vasicola pv. vasculorum strains from the United States and Argentina as well as in X. vasicola pv. holcicola strains. In this work, we explore the genomes of an emerging phytopathogen population as a first step toward identifying genetic changes associated with the emergence. The acquisitions identified may contain virulence determinants or other factors associated with the spread of X. vasicola pv. vasculorum in North and South America and will be the subject of future work.

Mots-clés Agrovoc : phylogénie, génome, Xanthomonas vasicol, Xanthomonas, génétique des populations, agent pathogène, génomique, amélioration des plantes

Mots-clés géographiques Agrovoc : Argentine, Afrique du Sud, Amérique du Sud, Afrique

Mots-clés libres : Bacteriology, Corn, Genetics and resistance, Horizontal gene transfer, Population biology, Xanthomonas vasicola pv. vasculorum, Xanthomonas vasicola pv. holcicola

Agences de financement hors UE : Colorado Corn Administrative Committee, Animal and Plant Health Inspection Service, Foundation for Food and Agriculture Research

Auteurs et affiliations

• Pérez-Quintero Alvaro L., Colorado State University (USA) - auteur correspondant
• Ortiz-Castro Mary, Colorado State University (USA)
• Lang Jillian M., Colorado State University (USA)
• Rieux Adrien, CIRAD-BIOS-UMR PVBMT (REU)
• Wu Guangxi, Colorado State University (USA)
• Liu Sanzhen, Kansas State University (USA)
• Chapman Toni A., NSW Agriculture (AUS)
• Chang Christine, Pacific Biosciences (USA)
• Ziegle Janet, Pacific Biosciences (USA)
• Peng Zhao, University of Florida (USA)
• White Frank F., University of Florida (USA)
• Plazas Maria Cristina, Universidad Católica de Córdoba (ARG)
• Leach Jan E., Colorado State University (USA)
• Broders Kirk, Colorado State University (USA) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/605395/)

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