Figure 7.
ABA content and response of wild type (Ben), lwr1, and lwr2 seedlings to applied S(+)-ABA. A, ABA content of 3-d-old seedlings after 96 h at the indicated ψw. Data are means ± se (n = 4–9). Regression lines were fitted to the combined data of wild type and lwr2 (r2 = 0.99) and lwr1 (r2 = 0.97). The two regression lines were significantly different (F test, P = 5 × 10−12). B, ABA content expressed as a function of RWC. Regression lines were fitted for each genotype (Ben, r2 = 0.99; lwr1, r2 = 0.44 [this line is not shown in the figure]; lwr2, r2 = 0.97). The wild-type regression line was significantly different from that of lwr2 (F test, P = 0.0003) C, Pro content 96 h after transfer to plates containing the indicated concentrations of S(+)-ABA. Data are means ± se (n = 7). Significant differences between mutant and wild type are indicated by an asterisk in the figure (P < 0.002).