Figure 6.

Phylogenetic Analysis of Nuclear and Chloroplast infA Sequences.

The diagram summarizes the maximum likelihood trees found when each of the four nuclear infA sequences was added individually to a constrained topology (the species phylogeny from Figure 1) for the 21 chloroplast sequences. The arrows indicate the most likely placement of the tomato (Solanum), soybean (Glycine), ice plant (Mesembryanthemum), and Arabidopsis nuclear sequences, and all branch lengths are drawn to scale horizontally. Mesembryanthemum cp denotes the ice plant chloroplast pseudogene. The branch lengths for the chloroplast sequences were identical in the four trees, allowing them to be merged. cp, chloroplast; nuc, nuclear.