FIG. 6.

Pathogenicity of the wild-type strain and its ferritin-negative mutants. (A) Symptoms caused by Erwinia chrysanthemi strain 3937 and its ferritin-deficient mutants on chicory leaves 36 h postinoculation. (B) Pathogenicities of the wild-type (WT) strain (solid line) and the ftnA mutant (dashed line) on African violets. The progression of systemic symptoms (i.e., fully macerated leaf and petiole) was scored for 9 days as indicated. Experiments were performed in triplicate, and standard deviations are shown.