Figure 8

Phylogenetic tree of plant OPTs. Clustering of 17 Arabidopsis, 26 rice and 22 unique barley sequences. Colours indicate membership to the OPT (yellow) and the yellow stripe-like (YSL) family. According to Zheng et al. [26] YSL transporter sequences are subdivided into the subgroups YSL-1 (red), YSL-2 (orange), YSL-3 (green) and YSL-4 (blue). Barley sequences were derived from RNA-seq and publications (HvYSL1 + 2). Clustering of OPT sequences into different subgroups is supported by the sequence distance matrices (Additional file 6: Figure S6). Detailed version of the phylogenetic tree including ID-numbers of all sequences is given in Additional file 7: Figure S5. For further explanations see legend of Figure 6.