Fig. 9

The evolutionary model of the exon-intron structure of PRX genes. This graph displays the evolution of PRX subfamilies in four representative plants (C. reinhardtii, P. patens, S. moellendorffii and T. aestivum). We found that a conserved exon-intron structure with exon phase “001” in the PRX domain was present in many PRX subfamilies of the investigated plants. These “001” structures are circled by a green box and red arrow. The descriptions of the domain and exon phases are the same as those in Fig. 2