Positions of SET genes on Populus chromosomes. (A) Map of the SET gene positions on Populus chromosomes. Numbers refer to locus ID as listed in Table 1. The SET genes found on duplicated chromosomal segments are connected by lines. (B) Frequency distribution of Ks between all syntenically duplicated gene pairs in Populus. The light blue box indicates a recent polyploidy event (since the split from the Arabidopsis lineage), denoted p; the pink box marks a duplication event apparently shared among the eurosids (γ); the dark blue box denotes a possible overlap of ancient polyploidy events shared with all the seeds plants (ε) or angiosperms (ζ). (C) One example of the detailed locations of representative pairs of genes duplicated in recent polyploidy events in the syntenic region. (D) Detailed location of representative duplicated pairs from ancient polyploidy events in the syntenic region.
Lei et al. BMC Evolutionary Biology 2012 12:51 doi:10.1186/1471-2148-12-51