Table 2.
Materials | Mt-Mt paralogsa | Gm-Mt paralogsa | Gm-Gm paralogsa | Gm-Mt orthologsb | References |
ESTs | 0.65–0.70 | - | 0.45–0.50 | 0.40–0.50 | Blanc and Wolfe, 2004 |
ESTs | 0.71 | - | 0.54 | - | Schlueter et al., 2004 |
39 Gene families | - | - | 0.57± 0.05 | 0.57± 0.02 | Pfeil et al., 2005 |
Lipoxygenases | 0.75 | 0.62c | 0.46 | 0.45d | This study |
aThe median Ks value between paralogs represents polyploidy events.
bThe median Ks value between orthologs denotes taxon divergence between soybean and Medicago.
c, d The median Ks values between Gm-Mt paralogs and Gm-Mt orthologs are compared to rule out skewing estimates caused by differential substitution rates. Thus, the ancient polyploidy predates the taxon divergence.