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When the plasmid pSa is introduced intoAgrobacterium tumefaciens , its presence results in the suppression of bacterial virulence.A. tumefaciens (pSa) cells are virulent onBryophyllum diagremontiana only when inoculated with auxin.A. tumefaciens (pSa) cells also bind to plant cells only in the presence of auxin. The effect of auxin is on the bacteria rather than on the plant cells, since the bacteria require auxin to bind to heat-killed carrot cells. Bacteria containing pSa and grown in the absence of auxin showed a lag in binding to carrot cells in auxin-containing medium. This lag was not seen during the binding of wild-type strains. Tetracycline inhibited the binding ofA. tumefaciens (pSa) in auxin-containing medium, suggesting that bacterial protein synthesis is required for the auxin effect. No difference was seen in the size or ability to inhibit bacterial binding of lipopolysaccharides from bacteria containing or lacking pSa and grown with or without auxin.A. tumefaciens (pSa) cells grown in the absence of auxin lacked surface polypeptide(s) found in bacteria grown in the presence of auxin and in the wild-type bacteria, which do not contain pSa. Thus, the presence of certain polypeptides appears to be associated with the ability of the bacteria to bind to plant cells.

Effect of Plasmid pSa and of Auxin on Attachment of Agrobacterium tumefaciens to Carrot Cells