Abstract
Xanthomonascampestris pv. glycines causes bacterial pustule disease on susceptible soybean cultivars. This disease is characterized by host cell hypertrophy leading to pustule formation at the site of infection. Sixteen virulent and four avirulent isolates were examined for the presence of plasmids by detergent lysis and electrophoresis. All virulent strains harbor between one and three plasmids. All avirulent strains are plasmid free. Ten of the virulent strains contain an approximately 18 megadalton (mdal) plasmid. The other six virulent strains have a plasmid between 11 and 29 mdal in size. Restriction endonuclease digestion with BamHI and PstI indicates identity or near identity for all these plasmids. Two virulent strains harbor an additional 26 mdal plasmid. One of these also contains a 110 mdal plasmid. Nine virulent strains have in common an approximately 1 mdal plasmid which is, in all but one case, refractory to BamHI and PstI digestion. None of the strains are resistant to any of the 15 antibiotics and antibacterials examined. The function of these plasmids in X. campestris pv. glycines is not known. The presence of the 18 mdal plasmid or its derivatives in all virulent strains, and its absence from all avirulent strains tested to date, suggests a role in pathogenicity.
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