Fig. 2From: Comparative transcriptome analysis reveals evolutionary divergence and shared network of cold and salt stress response in diploid D-genome cottonSequence diversity of four species of cotton. a Unrooted phylogenetic tree of four species using SNPs, which obtained from transcriptomic data. The scale bar represents the expected number of substitutions per site. b The relationship showed by the principal component cluster among four species. c Phylogenetic tree of nine genomes using the identified orthologous genes. The scale bar represents the expected number of substitutions per site. d Boxplot of the dN/dS ratio of nine genomes. Wild species, red boxes. Cultivated species, green boxesBack to article page