Fig. 6

Senescence associated WRKY genes from switchgrass and other plants. a A combined Neighbor-Joining phylogenetic tree of all switchgrass and A.thaliana WRKY domain containing genes. The senescence-associated co-expression module 3 switchgrass genes are indicated in red. b A combined phylogenetic tree of all switchgrass and Arbabidopsis WRKY domains and several other senescence-inducible genes from other plants. The senescence-associated module 3 switchgrass genes are indicated in red, senescence-associated WRKY genes from A. thaliana (blue), switchgrass (red) and other plants (green) are shown with inset close ups of clusters of senescence associated WRKY genes. The other plants include rice, banana, and Medicago truncatula. Higher plants groups of WRKY genes (I-III) are shown. The evolutionary history was inferred using the Neighbor-Joining method. The optimal tree with the sum of branch length = 29.93 is shown. The tree is drawn to scale, with branch lengths in the same units as those of the evolutionary distances used to infer the phylogenetic tree