pen3-5 and pen3-6 plants retain susceptibility to G. orontii. A, Macroscopically visible sporulating G. orontii mycelium (8 dpi) on leaves of wild-type (WT), pen3-5, and pen3-6 plants but not on pen3-1, pen3-2, and pen3-4 leaves. Note the pathogen-inducible leaf chlorosis in pen3-1, pen3-2, and pen3-4 leaves. Bar = 1 cm. B, Reproductive success of G. orontii on leaves of the indicated genotypes quantified by conidiospore counts (8 dpi). C, Free SA levels in leaves of noninoculated (white bars) and G. orontii-inoculated plants (4 dpi; black bars) of the indicated genotypes. D, Total SA levels in leaves of noninoculated (white bars) and G. orontii-inoculated plants (4 dpi; black bars) of the indicated genotypes. Error bars denote sds from at least 15 plants. FW, Fresh weight; **, statistically significant differences between the wild type and mutants (P < 0.01, Student’s t test).