Fig. 2
From: Evolution, expression and functional analysis of cultivated allotetraploid cotton DIR genes
Duplication events among DIR genes. a Segmental and tandem duplications in G. barbadense. Green and blue lines indicate segmental duplications within At- and Dt-subgenome, respectively. Red lines indicate tandem duplications. Ks values are displayed next to the lines. Orange lines link homologous genes between At- and Dt-subgenome. b Segmental and tandem duplications in G. hirsutum. c The expansion of cotton DIR gene family. The phylogenetic tree consists of 107 GbDIRs, 107 GhDIRs and 23 reported DIRs (in a white font). Track i marks segmental duplications, while tracks ii, iii, iv and v mark tandem duplications with Ks ranges of 0.0–0.2, 0.2–0.6, 0.6–1.9 and 1.9–3.0, respectively