Figure 6
From: Tracking the evolution of a cold stress associated gene family in cold tolerant grasses
Evolutionary relationships between the wheat IRI-like sequences inferred with an IRI-like gene specific molecular clock rate. Phylogenetic trees based on pairwise synonymous distances made with Unweighted Pair Group Method with Arithmetic Mean (UPGMA). Distance scale shows synonymous site divergence and estimated absolute divergence time in million years. Internal nodes represent duplication, speciation, or allelic divergence events. DA = ancient duplication events shared by wheat, barley, and perennial ryegrass; DWB = duplication events shared by wheat and barley; DW = duplication events exclusive for the wheat lineage; SWB = speciation event between wheat and barley; SABD = speciation event for the A, B, and D genomes of wheat; A = allelic divergence event. A) Tree based on all wheat IRI-like sequences. B) Sub-tree of monophyletic clade II including the two most recently radiated IRI-like sequences in our dataset (HvC1 and TaC4). C) Sub-tree of monophyletic clade I including the single most recently radiated barley IRI-like sequence.