Figure 4.

Phylogeny of the ABCB genes. Maximum likelihood phylogeny of ABCB genes from land plants, based upon coding sequences from the loci listed in Table A4 in Appendix. Gray branches indicate nodes with bootstrap support lower than 50%. Algal ABCBs are colored light blue–green, basal land plants blue, Populus green, Arabidopsis red, and monocots yellow. Abbreviated names of each species are listed in Table A1 in Appendix. An alternative phylogeny for the ABCBs based on dynamic homology and parsimony, generated with the program POY v.4.1.2, is shown in Figure A3 in Appendix.