<i>abo8</i> mutants are hypersensitive to ABA in seed germination and root growth.

<p>A. The root growth phenotype of <i>abo8</i> mutants on MS medium or MS medium supplemented with different concentrations of ABA. Four-day-old seedlings grown on MS were transferred to MS medium containing 0, 10, or 30 µM ABA for 5 days before they were photographed. Bars = 5 mm. B. Statistical analysis of the root length in different growing times. C. Relative root growth. Root length is expressed relative to that of the wild type or <i>abo8</i> mutants without ABA. In (B) and (C), three independent experiments were done with similar results, each with three biological repeats. Five roots from one plate were measured for each repeat. Values are means ±SE, n = 3. **: P<0.01. D. Seed germination greening of <i>abo8</i> mutants after 7 days on MS medium supplemented with 0.0, 0.3, or 0.5 µM ABA. Bars = 2 mm. E. Statistical analysis of seed germination greening rate in (D). Three independent experiments were done, each with three replicates (from three different plates). About 24 seeds were counted for each plate. Values are means ±SE, n = 3. **: P<0.01.