For example, the expression of CHS (IGS057) (Figure 5V) and CYP99A1 (IGS030) (data not shown) that are associated phytoalexin biosynthesis in plants, and of chitinase 1 (spot 09) (Figure 5X) with the function of degrading fungus cell wall, was induced in both Wangshuibai and the mutant after infection, suggesting that they are involved in basal defense but not resistance. This evidence concerns the gene CHIT1 and infection.