Fig. 1: The structure and evolution of the subgenomes of tetraploid switchgrass.
From: Genomic mechanisms of climate adaptation in polyploid bioenergy switchgrass
a, Grey polygons (representing n = 53 syntenic blocks) demonstrate nearly complete co-linearity between subgenomes. Gene-rich chromosome arms and highly repetitive pericentromeres are typical of grass genomes. LTR, long-terminal repeat. b, Subgenome divergence of <4.6 Ma was estimated from a time-scaled phylogenetic tree calibrated to the Panicum–Setaria node at 13.1 Ma.
