A Molecular Phylogeny of Sorbus（Rosaceae）Based on ITS Sequence
The systematic circumscription of Sorbus has remained unresolved because of hybridization and polyploidy.To reconstruct the phylogeny of Sorbus,we sequenced the nuclear ribosomal DNA ITS region of 46 species of the genus and outgroups species Cotoneaster multiforus,Cotoneaster horizontalis,Exochorda racemosa,Rosa hugonis and Cerasus glandulosa.The phylogenetic relationships among 43 species of Sorbus were investigated by means of maximum parsimony（MP）,maximum likelihood（ML）and bayesian inference（BI）analyses.The results revealed that the genus Sorbus is monophyletic;Subg.Aria,Subg.Micromeles and Subg.Sorbus were not monophyletic,respectively;The circumscription between unifoliate group and multifoliate group is unclear.The results are not in accordance with the previous morphological classification.
NETL
NSTL
万方数据
维普
