Figure 1

ACC content. ACC content (free and conjugated; pmol mg⁻¹ FW⁻¹) in roots (A) and leaves (B) of 3 weeks old Arabidopsis thaliana plants exposed for 24 or 72 h to either 5 or 10 μM CdSO₄ or grown under control conditions in a hydroponic culture system. Data are given as mean ± s.e. of at least 5 biological replicates. The letters a-d (A) & a-c (B) represent groups with significantly different amounts of ACC (Tukey's test: p < 0.05; except for free ACC content in the roots, Wilcoxon rank sum test: p < 0.05). Statistics was performed separately for free and conjugated ACC.