Figure 1.

Analysis of the response of 18 wild accessions of Arabidopsis thaliana (L. Heynh) to extended simulated winter chill, by incubation in the dark at 4°C. The effect of chilling on dormancy was assessed by testing germination frequency when seeds are placed under favourable conditions at 22°C for 7 days. Germination is shown as mean and standard error of five seed batches per genotype per treatment. Brown lines indicate seed matured at 20°C, orange lines 15°C and yellow lines 10°C.