Fig. 2. Shoot and root biomass accumulation of PI 407155 and Essex seedlings during a 15-d period of dehydration treatment. Error bars indicate ± one standard error of the mean. Vertical Bars representing mean values followed by the same letter are not significantly different (P < 0.05 level) for the same part of seedling under different periods of dehydration treatment (5, 10, 15 d).