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RpoS is required for full acrA expression in planta at a high cell density. GUS activity in cells grown in the susceptible tomato cultivar Bonny Best was determined. The acrA::uidA fusion was introduced into wild-type K60 cells and the rpoS mutant strain (K999). The adjusted cell density (CFU/ml of xylem fluid) is indicated on the x axis. The data are the means ± standard errors of the means for three independent measurements obtained using six plants per treatment.
