Abstract
We recently reported that two diverse types (types 1 and 2) were identified among strains of Erwinia carotovora from mulberry trees. Type 1 strains were similar to E. carotovora subsp. carotovora (Ecc), whereas type 2 strains were distinct from Ecc and other E. carotovora strains. In this study, seven more mulberry strains of type 2 and reference strains were analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and randomly amplified of polymorphic DNA (RAPD). On the basis of SDS-PAGE profiles of whole-cell proteins, type 2 strains had high similarity with one another. In addition, they had an unique peptide band with a molecular mass of approximately 28 kDa. RAPD analysis showed that they were also effectively differentiated by a strong, specific RAPD fragment for type 2 strains. Based on these two approaches, we have confirmed that the present type 2 strains from mulberry can be discriminated clearly from other soft rot Erwinia species.
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