Characterization of bacterial strains of Pseudomonas syringae pv. syringae isolated from pepper leaf spot in Macedonia

A new bacterial leaf spot disease on pepper seedlings (Capsicum annuum cv. ‘Kurtovska kapija’) was observed in 1995 in Macedonia. Pseudomonas bacteria were isolated, belonging to LOPAT group Ia. Symptoms similar to natural symptoms were reproduced following inoculation on pepper seedlings. Some isolates produced syringomycin and none of them were pathogenic to lilac. In a numerical taxonomic study of five pepper isolates in comparison with 58 pathovars of P. syringae and 10 related species, the five pepper isolates clustered in one phenon. Considering phenotypic characteristics, serology, DNA relatedness and pathogenicity tests, it was concluded that the pepper strains belong to P. syringae pv. syringae. Key words: Pseudomonas syringae, phenotypy, serology, DNA-DNA hybridization, pathogenicity, numerical taxonomy

La tâche bactérienne due à un pseudomonas sp.

National audienc

Etude de l’implantation épiphylle de Xanthomonas campestris pv. corylina, X. campestris pv. juglandis, Erwinia herbicola et Pseudomonas paucimobilis sur feuilles de noisetier

Sur noisetier, l’étude expérimentale de la vie épiphylle d’une bactérie pathogène homologue X. c. pv. corylina, d’une bactérie pathogène hétérologue X. c. pv. juglandis et de deux bactéries saprophytes E. herbicola et P. paucimobilis a montré que seul X. c. pv. corylina se multipliait intensément et se maintenait à haut niveau (106-107 c.f.u./feuille) alors que pour les autres on ne dénombre que 103-105 c.f.u./feuille. Les observations en microscopie électronique à balayage montrent que les bactéries d’abord réparties de façon aléatoire sur la feuille, se localisent ensuite dans les dépressions des nervures et à moindre degré du limbe. Les Xanthomonas s’agglutinent dans un mucus qui se rétracte.Experimental study of the epiphyllous survival of a pathogenic homologous bacterium (X. c. pv. corylina), of a pathogenic heterologous bacterium (X. c. pv. juglandis) and of two saprophytic bacteria (E. herbicola et P. paucimobilis) on hazelnut showed that only X. c. pv. corylina multiplied intensively and stayed between 106 and 107 c.f.u./leaf. The other bacteria only reached 103 to 105 c.f.u./leaf. Observations with a scanning electron microscope showed that the bacteria first spread at random over the leaf and were then located in the hollows, on veins and sometimes on the lamina. The xanthomonads agglutinated in a mucus, which later cracks

Description and identification of the new phytopathogenic bacterium causing bacterial black spots on Corn salad (Valerianella locusta), as Acidovorax valerianellae

Description and identification of the new phytopathogenic bacterium causing bacterial black spots on Corn salad ([i]Valerianella locusta[/i]), as[i] Acidovorax valerianellae[/i]. 10. International Conference of Plant Pathogenic Bacteri

Effect of extraction methods on recovery and affinity of immunoglobulin of bacterium Xanthomonas corylina

Effect of extraction methods on recovery and affinity of immunoglobulin of bacterium [i]Xanthomonas corylina[/i

Black spot of lamb's lettuce, a new bacterial disease.

International audienc

Genetic diversity of Pseudomonas syringae pathovars and related species assessed by DNA heteroduplex mobility assay

Genetic diversity of [i]Pseudomonas syringae[/i] pathovars and related species assessed by DNA heteroduplex mobility assay. 10. Internationl Conference of Plant Pathogenic Bacteri