Fig. 2

Phylogenetic tree, gene structure, and conserved motif analysis of GhPHD proteins. a An unrooted phylogenetic tree was generated in MEGA 6.0 by neighbor-joining (NJ) method. b Exon-intron structure of GhPHD genes. The yellow boxes represent exons, black lines represent introns, and blue boxes represent the upstream/downstream UTRs. The sizes of exon and intron can be estimated using the scale bar at the bottom. c Motifs distribution of GhPHD proteins and different motif boxes are represented in different colors (motif 1 to 3). Motif 1 is the PHD domain