Fig. 2.

Effects of atrazine on primary root growth of 1-week-old plantlets of the different accessions germinated and grown in the presence of atrazine. Results (mean ± s.e.m.) are expressed as a percentage of growth relative to control plantlets grown in the absence of atrazine; treatment concentrations of atrazine are as indicated. Statistical comparison between means was carried out using one-way ANOVA followed by Duncan's test. Statistical significance of differences (P ≤ 0·05) between accessions subjected to 0·5 µm atrazine is indicated by different letters above bars.