Figure 5

Expansion of the Lx gene family in soybean and Medicago homologous regions in relation to the evolutionary events in the six regions. No direct evidence of a recent polyploidy event in Medicago was detected; instead, tandem duplication of Lxs was observed in MtB. In soybean, two pairs of Lx regions generated by two rounds of polyploidy were identified and analyzed. Each pair of soybean regions is co-orthologous to the region in Medicago, suggesting co-orthologous regions produced by lineage-specific duplication in soybean.