Quercetin 3-O-methyltransferase gene family tree. Unrooted phylogenetic tree obtained from the strict consensus of 50%-bootstrap consensus neighbour-joining and parsimony trees and indicating two spruce gene duplications post-dating the gymnosperm-angiosperm split (no intervening Arabidopsis or rice sequence between spruce sequences) and one spruce gene duplication predating the gymnosperm-angiosperm split (with intervening Arabidopsis or rice sequences between spruce sequences). Sequences are from spruce (Pg), pine (Pt), Arabidopsis (AT) and rice (Os). GA: gymnosperm-angiosperm split, estimated at around 300 Mya .
Pavy et al. BMC Biology 2012 10:84 doi:10.1186/1741-7007-10-84