Fig. 4. Decay of the proportion of conserved sequences [C(t)] in orthologous intergenic regions with divergence time. The upper and lower red curves were calculated with two independent decay rate constants (K₁ and K₂), and the blue curve with the average rate constant. The circle labeled A represents identical sequences at the initial time of divergence. The comparison between T. urartu and durum A genome PSR920 regions (circle B) was used to estimate K₁ (upper red curve) (30). The comparison between einkorn and durum A genome VRN2 regions(circle C) was used to estimate K₂ (lower red curve). Comparison of orthologous intergenic regions between wheat B genome (AY368673) and D genome (AF497474) GLU1 regions (circle D) (59). Comparison of orthologous intergenic regions between wheat (AF459639) and barley (AY013246) VRN1 regions (circle E) (41, 42). [See SOM text for details.] [View Larger Version of this Image (182K JPEG file)]

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