Quantitative and molecular epidemiology of bacterial blight of onion in seed production fields

Humeau Laurence, Roumagnac Philippe, Picard Yann, Soustrade Isabelle, Chiroleu Frédéric, Gagnevin Lionel, Pruvost Olivier. 2006. Quantitative and molecular epidemiology of bacterial blight of onion in seed production fields. Phytopathology, 92 (12) : pp. 1345-1354.

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

Abstract : Onion, a biennial plant species, is threatened by the emerging, seed-borne, and seed-transmitted Xanthomonas axonopodis pv. allii. Bacterial blight epidemics were monitored in seed production Yields over two seasons. Temporal disease progress was different between the two seasons, with final incidence ranging from 0.04 to 0.06 in 2003 and from 0.44 to 0.61 in 2004. The number of hours with temperatures above 24°C was the best descriptor for predicting the number of days after inoculation for bacterial blight development on inoculated plants. Fitting the [bêta]-binomial distribution and binary power law analysis indicated aggregated patterns of disease incidence data. The [bêta]-binomial distribution was superior to the binomial distribution for 97% of the examined data sets. Spatial dependency ranged from 5.9 to 15.2 m, as determined by semivariance analysis. Based on amplified fragment length polymorphism (AFLP) analysis, it was concluded that plots predominantly were infected by the inoculated haplotype. A single other haplotype was identified by AFLP in all plots over the 2 years, and its detection in the field always followed wind-driven rains. X. axonopodis pv. allii-contaminated seed were detected by semiselective isolation and a nested polymerase chain reaction assay at levels up to 0.05% when final disease incidence was 0.61. Contaminated seed originated from both diseased and asymptomatic plants. (Résumé d'auteur)

Mots-clés Agrovoc : Allium cepa

Mots-clés géographiques Agrovoc : Réunion

Classification Agris : F03 - Seed production and processing
H20 - Plant diseases

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

  • Humeau Laurence, Université de la Réunion (REU)
  • Roumagnac Philippe, Max-Planck Institut für Infektionsbiologie (DEU) ORCID: 0000-0001-5002-6039
  • Soustrade Isabelle, CIRAD-AMIS-UMR PVBMT (REU)
  • Chiroleu Frédéric, CIRAD-AMIS-UMR PVBMT (REU) ORCID: 0000-0002-4874-5357
  • Gagnevin Lionel, CIRAD-AMIS-UMR PVBMT (REU)
  • Pruvost Olivier, CIRAD-AMIS-UMR PVBMT (REU)

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