Phylogenetic relationships and estimated divergence time of selected solanaceous species. The phylogenetic tree with molecular dating is based on Additional File 1. The external node Nicotiana represents the most recent common ancestor of N. tomentosiformis and N. acuminata, an extinct species possibly living at 7.5MYA . Estimated age of the 4 ancestral species (ATPt, ATE, ATP and ATN) is placed next to the corresponding interval node (highlighted with a black dot).
Wu and Tanksley BMC Genomics 2010 11:182 doi:10.1186/1471-2164-11-182