Genetic and pathological diversity among Xanthomonas strains responsible for bacterial spot on tomato and pepper in the Southwest Indian Ocean Region

Hamza Abdou Azali, Robène-Soustrade Isabelle, Jouen Emmanuel, Gagnevin Lionel, Lefeuvre Pierre, Chiroleu Frédéric, Pruvost Olivier. 2010. Genetic and pathological diversity among Xanthomonas strains responsible for bacterial spot on tomato and pepper in the Southwest Indian Ocean Region. Plant Disease, 94 (8) : 993-999.

https://doi.org/10.1094/PDIS-94-8-0993

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Quartile : Q1, Sujet : PLANT SCIENCES

Résumé : Bacterial spot of tomato and pepper, a major problem in tropical climates, can be caused by several #Xanthomonas genospecies#. We examined the genetic and pathological diversity of a collection of 72 strains from the southwest Indian Ocean region as part of a regional research and development program to update inventories of agricultural pests and pathogens. #Xanthomonas euvesicatoria#, #X. perforans#, #X. gardneri#, and #X. vesicatoria# were identified in our strain collection. The identification of strains at the species level was consistently achieved by amplified fragment length polymorphism (AFLP) and multilocus sequence analysis (MLSA). Overall, #X. euvesicatoria# was the species recovered prevalently. MLSA data based on four housekeeping genes identified two to three sequence types per genospecies. It suggested that sequence variations primarily consisted of synonymous mutations, although a recombination event spanning several hundred nucleotides was detected for some strains of #X. euvesicatoria# on the atpD gene coding for the F1-F0-ATPase â subunit. The pathogenicity of strains was consistent with data found in the literature. Some pathological variations were primarily observed among strains identified as #X. euvesicatoria#. This study provides the first ever comprehensive description of the status of #Xanthomonas# species that cause bacterial spot of tomato and pepper in the southwest.

Mots-clés Agrovoc : Xanthomonas, Solanum lycopersicum, Capsicum annuum, Raphanus sativus, variation génétique, pouvoir pathogène

Mots-clés géographiques Agrovoc : océan Indien Sud

Mots-clés complémentaires : Xanthomonas perforans, Xanthomonas euvesicatoria, Xanthomonas gardneri, Xanthomonas vesicatoria

Classification Agris : H20 - Maladies des plantes

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

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