Figure 6

Unrooted NJ tree of phytochrome genes of A. thaliana and cottons ( Gossypium spp.) based on a 358 bp consensus alignment of amplification products from the hinge regions. Kimura two-parameter distances are shown for each branch. All internal branches had 100% bootstrap support (500 replicates). 1A, 1B, 1C and 1E denote gene divergence events likely resulting from speciation. 2 and 3 denote gene divergence events likely resulting from gene duplication. All Gossypium phytochrome genes are included within clusters (indicated by ovals).