Whole genome duplications in land plants. Maximum-likelihood topology generated under the JTT + Γ model in RAxML showing branch lengths for 65 class VIIIA myosin motor domains. The class XI myosin of Ostreococcus and 5 metazoan class V myosins were included as outgroup. The tree was used as reference species tree to map formerly described and newly proposed WGDs and genome triplication events (WGTs) on the respective branches. Branches are labelled for better orientation. White boxes indicate WGDs described in the literature. The numbers point to the first publications describing the respective event. Letters are shown for duplications that are usually referred to by Greek letters. Orange boxes indicate newly proposed WGDs. The numbers in boxes refer to the following publications: 1 (Physcomitrella) - , 2 (Ranunculales) - , 3 (Zingiberales & Arecales; the WGDs in the Musa acuminata branch are also called α, β, and γ) - , 4 (Zea) - , 5 (Panicum) - , 6 (Phrymaceae) - , 7 (Lactuca) - , 8 (Solanum) - , 9 (Phaseoleae) - , 10 (Glycine) - , 11 (Malus) - , 12 (Gossypium) - , 13 (Populus; also called ρ) - , 14 (Linum) - , 15 (Brassica) - , α, β (Brassicaceae) and γ (core eudicotyledons) - , ϵ (angiosperms) and ζ (spermatophyta) - , ρ and σ (Poaceae) - . The topology of the tree is in general accordance with those obtained by ClustalW (Neighbour joining) and MrBayes (Additional file 11). The scale bar corresponds to estimated amino acid substitutions per site.
Mühlhausen and Kollmar BMC Evolutionary Biology 2013 13:202 doi:10.1186/1471-2148-13-202