Fig. 1.

The effect of ploidy level (2x, 4x), plant origin (natural, synthetic) and population on (A) seed weight, (B) number of leaves at the age of 8 weeks, (C) number of pods per plant and (D) mean flowering time. S2x and S4x are diploid and tetraploid offspring of synthetic tetraploid mothers, respectively. Only germinated seeds are included in (A) because their ploidy level could be estimated. Columns sharing the same letter are not significantly different (P > 0·05). The graphs show means ± s.e.