Figure 1.

(A) Cotton blue staining of leaves confirming fungal infection (chitin-staining dye). Leaves of Arabidopsis plants after 7 days inoculation with Cylindrocladium sp. were stained and viewed under microscope with hyphae appearing in dark blue. (B) Visual disease scores for leaves of plants infected with root pathogen Cylindrocladium, 0 = no evidence of disease 1 = <10% 2 = ∼20% 3 = ∼50% 4 = ∼80% 5 = 100% of adaxial leaf area affected; scale bar divisions represent 1 mm. (C) Disease score per plant grown with IN (20 or 4 mM N) or IN+BSA (4+16 mM N). Scores were made on 4 to 6 mature leaves per plant and 12 plants, dpi (days post inoculation). Different letters indicate significant differences within each time point (dpi) at P < 0.001 (ANOVA, Neuman–Keuls post hoc test).