Nine strains belonging to 2 races of Xanthomonas axonopodis pv. malvacearum (Xam) were screened for their plasmid content. One Strain belonging to race 4, and has been attenuated as mutant from race 18 strain and show low virulence than race 18, despite it possesses the same plasmids of race 18 strains. According to plasmid profiles of these strains, 5 groups could be distinguished. First group includes the strain of race and 4 strains of race 18 isolated from Nicaragua, 1986. The other 4 strains of races 18, isolated from Nicaragua, 1986; USA, 1986; Sudan 1991 were distinguished in 4 distinct groups according of their plasmid profile. The attenuated strain of race 4 was more sensitive to antibiotics and heavy metal ions than race 18 strains. No indication that plasmids play a distinct role in virulence of Xam strains.
Plasmid, Xanthomonas, Antibiotics, Heavy metals
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