Phylogeny and biogeography of Dendropanax(Araliaceae),an amphi-Pacific disjunct genus between tropical/subtropical Asia and the neotropics
会议名称：《后植物志时代的系统与进化植物学——2011年全国系统与进化植物学暨第十届青年学术研讨会》
会议日期：2011年
关 键 词：amphi-Pacific tropical disjunction Araliaceae biogeography Dendropanax phylogeny
摘 要：Dendropanax(Araliaceae) is a genus of about 75-80 species disjunctly distributed in tropical to subtropical Asia and the Neotropics,showing an amphi-Pacific tropical *** phylogeny of the genus was constructed with the sampling of 95 accessions representing 33 species of Dendropanax and 43 closely related taxa employing sequences of the nuclear ribosomal internal transcribed spacer(ITS) region and six plastid regions(the ndhF gene,the trnL-trnF region,the rps16 intron,the atpB-rbcL intergenic spacer,the rp116 intron,and the psbA-trnH intergenic spacer).Phylogenetic analyses of the combined plastid and ITS data suggested that the monophyly of Dendropanax was not supported because the Asian D. *** clade did not group with the main Dendropanax ***,the maximally parsimonious trees(MPTs) from the analysis constraining Dendropanax as a monophyletic group were only one step longer than the unconstrained *** New World and the Old World Dendropanax except *** and *** each formed a robustly supported clade,and the two clades were sister to each *** on biogeographic analyses and fossil-calibrated Bayesian dating, Dendropanax was hypothesized to have originated in the Old World and migrated into the New World via the North Atlantic land bridges in the early *** amphi-Pacific intercontinental disjunction of Dendropanax was dated to be 41.83 mya with a 95%high posterior density[HPD]interval of 28.46-56.15 *** crown New World clade of Dendropanax was estimated at 27.43 mya(95%HPD;17.56-38.47 mya) and the crown Old World clade was dated to be at 24.92 mya(95%HPD;14.75-35.65 mya).The diversification in Central and South America was perhaps driven by the uplift of the northern Andes and the rising of the volcanic islands between South and Central America in the late *** diversification in the Old World was centered in southern China and Indochina,corresponding to the active orogenie