Figure 1.

WOX4 gene structure, phylogeny, and constructs. A, WOX4 gene structure is similar in Arabidopsis (AtWOX4) and tomato (SlWOX4). B, Phylogenetic comparisons reveal that Arabidopsis WOX4 is more similar to tomato WOX4 than to other WOX genes in Arabidopsis. Bootstrap values were calculated from 1,000 replicates using both the neighbor joining and maximum likelihood parsimony (in parentheses) methods. C, The Arabidopsis WOX4-RNAi and tomato WOX4 overexpression constructs used in this study.