Fig. 3

The phylogenetic trees of the PgHDZ gene family. a The phylogenetic tree of the PgHDZ gene transcripts constructed without the HD-Zip genes from outgroup species. The subfamilies of the gene family are indicated by I, II, III, and IV, and highlighted with different colored backgrounds. b The phylogenetic tree of the PgHDZ gene transcripts constructed with the HD-Zip genes from outgroup species. The HD-Zip genes from different species are highlighted in different colored fonts. The genes in blue font are from Panax ginseng (Pg); the gene in dark yellow from P. patens (Pp) (Moss); the genes in green font from Picea glauca (Pg) (Gymnosperm); the genes in pink font from G. biloba (Gb) (Gymnosperm); the genes in light-blue font from O. sativa (Os) (Monocots); the genes in orange font from Z. mays (Zm) (Monocots); the genes in red font from A. thaliana (At) (Eudicots-Rosids); the genes in dark pink from Z. elegans (Ze) (Eudicots-Asterids); and the genes in dark orange from S. lycopersicum (Sl) (Eudicots-Asterids). The trees were conducted with the Maximum Likelihood method by MEGA, with 2000 bootstrap replications. The circle in each branch indicates its confidence in percentage. The bar in the left-top corner of each tree indicates the scale of the tree branch lengths