Figure 3.
Phylogenetic hypothesis based on DNA sequences of the plastid trnL(UAA)–trnF(GAA) region of taxa from tribe Brassiceae and several outgroups using a maximum-likelihood (ML) approach as implemented in PAUP 4.0 (for details, see Methods). Bootstrap values are indicated above (ML analysis without Cakile) and below branches (ML analysis with Cakile), respectively. Divergence time estimates (nodes A–E) are given in million years ago (Mya) (see Table 3). The presumed polyploidization event is indicated by the arrow. Intratribal classification (Nigra and Rapa/Oleracea lineages) follows Warwick and Black (1991). Note that both Brassica and Diplotaxis are polyphyletic taxa.
