Figure 9.

DPI Restores Virulence of U. maydis Δyap1 Mutants.

(A) Maize seedlings were inoculated with mixtures of FB1XFB2 or FB1Δyap1XFB2Δyap1 to which DMSO or DPI dissolved in DMSO were added. Infected plant tissue samples were collected 2 d after infection and stained with DAB as indicated. DAB precipitates are marked with closed arrowheads, and hyphae without DAB precipitate in the vicinity are marked by open arrowheads. Bars = 10 μm.

(B) Symptoms produced by the indicated U. maydis strain combinations were scored following the scheme described in Figure 5.