Changes in SA and camalexin levels in 35S-STKR1 lines. A, Total SA (free SA + glycosylated SA) levels were measured after 4 weeks of plant growth under short-day conditions (8 h of light/8 h of dark). Data represent means ± sd (n = 3). Significant differences are indicated by asterisks (***, P < 0.001) and were calculated using Student’s t test. FW, Fresh weight. B, Camalexin levels in 35S-STKR1 plants compared with stkr1-1 mutants and the Col-0 wild type in 4-week-old plants. Data represent means ± sd (n = 3). Significant differences are indicated by asterisks (*, P < 0.05) and were calculated using Student’s t test.