Figure 1.

Phylogenetic relationships of protein disulfide isomerase (PDI) proteins identified in tomato (Solanum lycopersicum), poplar (P. trichocarpa), field mustard (Brassica rapa), Arabidopsis (A. thaliana), purple false brome (B. distachyon L.), and maize (Z. mays). The phylogenetic tree was constructed using MEGA6 software by the neighbor-joining method with 1000 bootstrap replicates based on 107 full-length PDI protein sequences from the above-mentioned plant species. The proteins were clustered into 11 groups (I–XI) belonging to four clades. The amino acid sequences used in the phylogenetic analysis are listed in Supplementary Table S3, along with their accession numbers.