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Role of Bacterial Lipopolysaccharide in Attachment of Agrobacterium to Moss ¹

^a Department of Biological Sciences, Northwestern University, Evanston, Illinois 60201

Gametophore induction in moss by Agrobacterium tumefaciens was inhibited by addition of lipopolysaccharide (LPS) from A. tumefaciens. The LPS did not affect bacterial viability or appear to bind to bacterial cells. LPS from nonbinding Agrobacterium radiobacter was not effective in reducing gametophore formation. A. tumefaciens LPS, if added 24 hours after addition of viable bacterial cells, had no effect in reducing gametophore formation. The polysaccharide portion of the LPS was identified as the binding component necessary for attachment of agrobacteria for induction of gametophores in moss and tumors in higher plants.