Abstract
A bacterial strain associated with the apical necrosis in mangoes (Mangifera indica L.) in southern Spain was isolated and characterized by means of biochemical and nutritional tests. The isolates were identified as Pseudomonas syringae pv. syringae. Similar bacterial strains were frequently isolated as epiphytic bacteria from healthy mango trees. The production of severai virulence factors by these strains were studied. The strains isolated from mangoes produce syringomycin and an extracellular toxin active on biosynthesis of arginine, blocking glutamate acetytransferase, that has not been previously reported. Also, the Plasmid content and the resistance to different chemical control agents (bactericides and antibiotics) of these strains were studied. The characteristics of the studied strains were compared with other P. syringae strains isolated from different healthy and diseased plants.
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