Interspecific relationships and origins of Tazus and Cephalotazus Partitioned Bayesian analyses of chloroplast and nuclear DNA sequences
A cladistic analysis of the sequences of five chloroplast and one nuclear (ITS) molecular markers was carried out, both individually and in combination, by distance, parsimony, likelihood, and Bayesian methods.The two families are monophyletic.In Taxus, T.floridana is the first-branching taxon; T.brevifolia and T.globosa cluster together and are sister to T.baccata; the endemic T.yunnanensis clusters with T.wallichiana in subclade B and is only distantly related with the other four Taxus species in China (subclade A); T.fuana is closer to T.baccata than to other Taxus species.Torreya jackii and A.formosana are the first-branching species within Torreya and Amentotaxus, respectively.C.koreana and C.wilsoniana could be treated as two varieties of C.harringtonia.The ancestral distribution area of Taxaceae and Cephalotaxaceae is restricted either to southwest China or southeast China by DIVA analysis.The relaxed molecular clock indicates that the deepest divergences in Taxus go back to the late-Cretaceous.Our results propose interspecies relationship within each group, with profound nomenclatural and taxonomic implications.Combination of partitioned Bayesian analysis and likelihoodbased methods produced a more robust phylogenetic hypothesis for the two studied families.
Cephalotazus phylogenetics partitioned Bayesian analysis historical biogeography divergence time estimation
Da Cheng Hao
Dept.of Biotechnology,College of Environment Dalian Jiaotong Univ.Dalian 116028,China
国际会议
北京
英文
1-4
2009-06-11（万方平台首次上网日期，不代表论文的发表时间）