Figure 9.

ACC inhibits lateral root initiation and primary root elongation through different ethylene receptors. Five-day-old seedlings were transferred to medium containing 1 µm ACC, and the lateral root number and primary root length were quantified after another 5 d. Averages and se of 30 seedlings are reported. The significance of ACC treatment within a genotype and between Col-0 and the indicated genotypes was assessed by ANOVA and Tukey’s posthoc test. ^aSignificant difference between control and treatment with ACC within a genotype, at P < 0.05; ^bsignificant difference between parental lines and mutant genotypes.