Figure 2.

Biological induction of SAR in ndr1-1 versus Columbia. Columbia plants (solid lines) or ndr1-1 plants (dashed lines) were inoculated with bacteria (squares for data points) or a MgCl₂ blank (circles for data points) 2 d prior to inoculation with P. syringae pv tomato DC3000 carrying only the empty pVSP61 vector. Primary inoculated leaves were excised prior to secondary inoculation. Data points represent means of triplicate determinations of in planta bacterial growth at specified time points. A, P.s. tomato DC3000 carrying avrRpt2 used for primary inoculation with bacteria. B, P.s. tomato DC3000 carrying avrB used for primary inoculation with bacteria. C, P.s. tomato DC3000 carrying empty vector used for primary inoculation with bacteria.