Figure 4.

35S-AREB1ΔQT Plants Are Hypersensitive to ABA.

(A) Growth of 35S-AREB1ΔQT (line 5) and 35S-AREB1 (line 6) plants on GM agar plates containing 0, 0.5, or 1.0 μM ABA. Seeds were germinated and grown on GM agar plates for 6 d; representative plants are shown.

(B) ABA dose response of root growth. Seeds were germinated and grown on GM agar plates containing various concentrations of ABA and 1% sucrose. Root elongation was measured 6 d after stratification, and relative growth compared with that on ABA-free medium is indicated. Bars indicate standard deviation; n = 26 to 38. The experiments were performed three or more times, sometimes using different transgenic lines, and the results were consistent.