Fig. 4.

CLO-induced enhanced resistance of Arabidopsis to powdery mildew is mediated by ICS1. Representative microscopic images at the leaf surface of a powdery mildew colony at 5 d postinfection, shown for Col-0 and ics1 plants treated with 4 mM CLO and infected 4 d later with powdery mildew conidia. c, germinated conidia; cp, conidiophores (reproductive structures). (Scale bar, 100 μm.) Quantitative data (n = 6 leaves) for total conidiophores per leaf and per colony on a leaf for above experiment. *P ≤ 0.002. An independent experiment (n = 6) gave similar results.