Figure 3.

Epistasis of NRB4 with NPR1.

(A) Three double mutants nrb4-1 npr1-70 were tested as in Figure 1A. FW, fresh weight; Laer-0, Landsberg erecta-0.

(B) 35S:NPR1-HBD (NPR1HBD) in an nrb4-2 background was tested with and without dexamethasone (DEX) for its response to BTH. The experiments were repeated three times with similar results, and the data represent the average, with the error bars plotting the sd of 15 plants in three groups of five. The letters above the bars indicate different homogeneous groups with statistically significant differences (Fisher’s LSD test, P < 0.05).