Fig. 1

Phylogenetic relationships and exon/intron structures of GH3 proteins in Arabidopsis and B. oleracea var. oleracea. a Phylogenetic analysis of GH3 family members in Arabidopsis and B. oleracea var. oleracea. The percentage of trees in which the associated taxa clustered together is shown next to the branches. The phylogenetic tree is drawn to scale, with branch lengths measured in the number of substitutions per site. Bootstrap test percentages of 1000 replicates are shown next to the branches. b Gene structures for Arabidopsis and BoGH3 proteins were generated by gene structure display servers (http://gsds.cbi.pku.edu.cn/Gsds_about.php). Note that exons indicated here do not contain untranslated regions. Astertisks indicate exon/intron structures of genes, which were annotated only in Ensembl Plants. The black boxes and lines represent exons and introns in B. oleracea var. oleracea GH3 genes, while the gray boxes and lines represent exons and introns in Arabidopsis GH3 genes. Groups (I~ III) and subgroups (4 & 6) of GH3 proteins were designated based on the Staswick et al. (2002) and Westfall et al. (2012), respectively [10, 12]