Simultaneous detection of 20 genes from either BTH- or water-treatedArabidopsis samples as a function of time (1, 3, 5, 7, and 9 d). The left panels (A,C,E,G) are the results detected from BTH-treated samples, and the right panels (B,D,F,H) are the results detected from water-treated samples (control). The 20 genes were organized into four groups in this figure for presentation according to their properties and their expression levels affected by BTH treatment. The first group contained BTH-induced genes (A,B), the second group had unchanged PR genes (C,D), the third group included BTH-repressed genes (E,F), and the fourth group consisted of control genes (G,H).