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Douze echantillons de riz provenant de differentes regions du Burkina Faso ont ete testes en vue de faire un inventaire des bacteries phytopathogenes transmises par les semences du riz. La methode de detection en milieu liquide (Liquid assay) utilisee a l\'Institut Danois de Pathologie de Semences a ete adoptee pour l\'isolement des bacteries. Des observations sur la fluorescence, la coloration et la forme des colonies en comparaison avec les bacteries de references ont ete faites pour le choix des colonies suspectes. Le profil biochimique des colonies choisies a ete utilise pour l\'identification des bacteries au niveau de l\'espece. Cette identite a ete confirmee par les tests de pathogenie sur les plantules de riz. 92 % des echantillons de semences testees ont ete infestees par les bacteries. Acidovorax avenae subsp. avenae ainsi que Xanthomonas oryzae pv. oryzae ont ete chacune detectees dans 50 % des echantillons et Burkholderia Glumae dans 16,66 %. 52 % des bacteries identifiees se rapportent a Acidovorax avenae subsp. avenae, 35 % a Xanthomonas oryzae pv. oryzae et 13 % a Burkholderia glumae. Pseudomonas fuscovaginae et Pseudomonas syringae pv syringae n\'ont pas ete rencontres dans les echantillons etudies. Twelve seed samples of rice from various localities of Burkina Faso were screened for the presence of seed-transmitted plant pathogenic bacteria. The liquid assay used at the Danish Government Institute of Seed Pathology for Developping Countries was the method used for the extraction of bacteria. The observation of the fluorescence on King\'s B medium, the colour and colonies morphology in comparison with the reference were the methods used for the choice of suspected bacteria. Identification of colonies was performed on biochemical characteristic and pathogenicity tests. 92 % percent of seed samples tested were infected by bacteria. Acidovorax avenae subsp.avenae as well as Xanthomonas oryzae pv. oryzae were each detected in 50 % of seed samples andBurkholderia glumae in 16.66 %. 52 % of bacteria belong to Acidovorax avenae subsp. avenae, 35 % to Xanthomonas oryzae pv. oryzae and 13 % to Burkholderia glumae. Pseudomonas fuscovaginae and Pseudomonas syringae pv syringae were not detected in the seed samples tested. Keywords : Bacteries, detection, semences, riz, Burkina Faso; Bacteria, detection, seeds, rice, Burkina Faso. Agronomie Africaine Vol. 16 (2) 2004: pp. 9-17

Detection Et Caracterisation Des Bacteries Phytopathogenes Transmises Par Les Semences Du Riz Au Burkina Faso