tt8 (Ws) leads to enhanced susceptibility, while DEX-induced TT8:GR (Col) overexpression increases resistance against Pst DC3000 infection. A, Disease symptoms in WT (Ws) and tt8 (Ws); B, DEX-induced overexpression of TT8:GR (Col) and mock-treated TT8:GR (Col) lines. Five-week-old Arabidopsis plants were spray-inoculated with a suspension of Pst DC3000 (108 cfu) or mock-treated. The images of plants showing disease symptom were taken 3 d after inoculation. C, Bacterial growth in leaves of WT (Ws), tt8 (Ws), DEX-induced TT8:GR (Col) overexpression, and mock-treated TT8:GR (Col) lines, 3 d after spray inoculation of Pst DC3000 suspension or mock treatment. Results are shown as mean ± se based on three replications (P < 0.05).