Comparative susceptibility of Arabidopsisplants to B. cinereainfection. Arabidopsisplants were inoculated with B. cinereaspores (1 106spores/ml) suspended either in Gamborgs B5, Gamborgs B5 supplemented with the TLC-purified PDB-derived saponin (0.1 g/ml), or Gamborgs B5 supplemented with PDB (6 g/l). Bars represent the mean SEM obtained from six biological replicates; different letters among bars indicate significant differences (BrownForsythe and Walch ANOVA test; Benjamini, Krieger, and Yekutieli test,p< 0.01). A representative leaf from each of the three inoculation media (at 4 dpi) is shown on the right for comparison.
