Fig. 2From: Genome-wide characterization and expression profiling of SWEET genes in cabbage (Brassica oleracea var. capitata L.) reveal their roles in chilling and clubroot disease responsesNumber of SWEET genes from 14 plant genomes in four clades. Horizontal bars (ζ and ε) denote confidence regions for ancestral seed plant whole genome duplication (WGD) and ancestral angiosperm WGD; The γ and Brassica-specific triplication, α, β, σ, ρ and salicoid duplication are indicated on the branches of the tree according to previous reports [45, 83]Back to article page