Figure 1.

FB1 Induces Lesion Formation in Arabidopsis.

(A) Ten-day-old Col-0 Arabidopsis seedlings were transferred to MS plates (−FB1) or MS plates supplemented with 1 μM FB1 (+FB1) and photographed 4 days later. Necrotic lesions on the FB1-treated seedling are indicated by arrows.

(B) Two lower leaves of 4-week-old Arabidopsis plants were infiltrated with 10 mM MgSO₄ (left) or 10 μM FB1 in 10 mM MgSO₄ (right) and photographed 7 days later. Dead FB1-infiltrated leaves are indicated with arrows.

(C) Lower leaves of 4-week-old Arabidopsis plants were infiltrated with 10 mM MgSO₄ (Mock) or 10 μM FB1 in 10 mM MgSO₄ (FB1). Plants were exposed to a 12-hr-light photoperiod (Light) or covered with aluminum foil (Dark) for 3 days. Infiltrated leaves are shown above; systemic, noninfiltrated leaves are shown below.