Fig. 5.

Microscopic observations on powdery mildew infection at 44 h post inoculation (hpi). a. In the wild-type allele-carrying plant (TV161209) a normal development of the spores occurs; appressorium and hyphae are developed. b,c. In the mutant plant (TV171010; event 4) cell death is observed in epidermal cells invaded by the fungus. c shows a deeper focal plane involving the same infection unit as in b; a haustorium is present in the cell showing cell death. d. Both cell death and hyphal growth in mutant plant TV171010. e. Comparison of number of hyphae per infection unit between wild type and pmr4 mutant plants