Fig. 3

A phylogenetic tree of NRPD1/E1 in land plants. A maximun likelihood (ML) tree for NRPD1/E1 is shown in a radial format. Sequences in bryophytes, lycophytes, and ferns were obtained from assembled transcripts in this study, and sequences in angiosperms were from Phytozome. Simplified protein structures are shown beside the sequence accessions and in the upper left corner. RPB domains are represented by the blue rectangles and the DeCL domain is represented by the green rectangles. Light blue, bryophytes; magenta, lycophytes; red, Polypodiales (ferns); green, Salviniales (ferns); orange, angiosperms; black, other ferns. Numbers beside nodes are bootstrap support values showing confidence (from 0 to 100). Key values are enlarged and labeled with different colors: red (over 50) for the clustering of genes from ferns and angiosperms and blue (less than 50) for the clustering of earlier-divergent species and ferns/angiosperms. Alignment length, 1830 nt