Molecular phylogenetics, temporal diversification, and principles of evolution in the mustard family (Brassicaceae).

摘要: Brassicaceae is an important family at both the agronomic and scientific level. The not only inlcudes several model species, but it also becoming evolutionary However, resolving phylogenetic relationships within has been problematic, a large-scale molecular phylogeny in terms of generic sampling number genes still lacking. In particular, deeper family, for example between three major recognized lineages, prove particularly hard to resolve. Using slow-evolving mitochondrial marker (nad4 intron 1), we reconstructed comprehensive representation family. addition, because resolution was very low previous single phylogenies, adopted supermatrix approach by concatenating all checked reliable sequences available on GenBank as well new total 207 currently genera eight markers representing coverage genomes. dated under uncorrelated relaxed clock using direct fossil calibration approach. Finally, lineage-through-time-plot rates diversification were generated. resulting tree, largest sampled date covering whole representative way, provides insights into evolution broad scale. backbone tree remained largely unresolved interpreted consequence early rapid radiation age inferred be 37.6 (24.2–49.4) Ma, which agrees with studies. ages lineages tribes are reported. Analysis suggests that underwent period diversification, after split diverging tribe Aethionemeae. Given dates found here, appears have originated warm humid climate approximately 37 Ma. We suggest detected caused global cooling during Oligocene coupled genome duplication event. This could allowed rapidly adapt changing climate.