Phylogenetic analysis of <i>Populus trichocarpa</i> (Pt) and <i>Arabidopsis thaliana</i> (At) SODs based on predicted amino acid sequences.

<p>The neighbor-joining tree was generated using Mega 5.05 <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0056421#pone.0056421-Tamura1" target="_blank">[31]</a>. The bootstrap method with 1000 replicates was used as a test of the phylogeny. The three groups identified include the copper/zinc SODs (triangles), manganese SODs (squares), and iron SODs (circles). Poplar and <i>Arabidopsis</i> sequences are marked with solid and empty symbols, respectively.