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Emergence of Xanthomonas euvesicatoria pv. perforans as the Causal Agent of Bacterial Spot of Tomato in Argentina

Year: 2025

Type: article

Abstract: ABSTRACT A bacterial spot outbreak affecting tomato crops was recorded in January 2020 in Berazategui, Buenos Aires Province, Argentina. This disease is known to be caused by three species of Xanthomonas : X. vesicatoria , X. euvesicatoria pv. euvesicatoria , X. euvesicatoria pv. perforans , and X. hortorum pv. gardneri . To identify the causal agent of the outbreak, symptomatic leaves and fruits were collected and analysed in the laboratory. Yellow‐pigmented bacterial colonies were consistently isolated from the lesions. Four representative isolates were selected and characterised based on physiological traits, BOX‐PCR genomic fingerprinting, species‐specific PCR, and partial sequencing of the hrpB gene. Pathogenicity was assessed by immersion inoculation of the aerial parts of tomato plants in a bacterial suspension of each strain (10 6 CFU/mL). Two isolates (20.A3 and 20.A5) were identified as X. vesicatoria , while the other two (20.A2 and 20.D9) were identified as X. euvesicatoria pv. perforans . Although bacterial spot of tomato is a common disease in Argentina, to our knowledge, this is the first report of X. euvesicatoria pv. perforans infecting tomatoes in the country.

Source: Journal of Phytopathology

DOI: 10.1111/jph.70188

Authors: Verónica Felipe, Marcela S. Montecchia, O. Hernán von Baczko, Ana M. Romero

Institutions: Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires, National University of Villa María

Language: English

Topic: Plant Pathogenic Bacteria Studies

Subfield: Plant Science

Field: Agricultural and Biological Sciences

Domain: Life Sciences

SDG: Zero hunger

Open Access status: bronze

Funders: Universidad de Buenos Aires, Secretaría de Ciencia y Técnica, Universidad de Buenos Aires