Fig 6.
Virulence defect of the A. tumefaciens Δhfq strain on potato discs. Quantitative tumor formation assay on potato tuber discs. (A) Amounts of 104 and 106 cells/disc of A. tumefaciens wild type (WT), the Δhfq mutant, the complemented mutant (Δhfq+hfq), and control strains harboring the empty vector (v) (WT+v and Δhfq+v) were examined for their tumor formation efficiency on potato discs. Tumorigenesis efficiency is scored by the number of tumors per disc (mean value calculated from results of 60 potato tuber discs for each strain in each independent experiment; error bars show standard errors of the means). (B) Representative pictures of tumors on potato discs. Two independent experiments gave similar results.