Fig. 1.

HopI1_Pma is a virulence factor on many crops. Arabidopsis, tobacco, and peas were infiltrated with bacteria (OD₆₀₀ = 0.0003), and bacterial growth was quantified 3 days after inoculation (dpi). Tomato and mustard family plants were sprayed with bacteria (OD₆₀₀ = 0.005), and bacterial growth was quantified 7 dpi. Deletion of hopI1 resulted in reduced bacterial growth (*P < 0.05). Gray bars, PmaΔhopI1 strain; white bars, PmaES4326 strain. Growth experiments were repeated two or more times with similar results.