安息香科系统发育与生物地理学研究

The dicotyledonous family Styracaceae is distributed among all the.major Tertiary mixed-mesophytic forest refugia of the Northern.Hemisphere. To infer the biogeographical history of the family and its.significance for models of Northern Hemisphere historical biogeography;.the phylogeny of the Styracaceae was estimated from separate and.combined analyses of three DNA sequence data sets (chioroplast trnL.intron/trnL-trnF spacer, chloroplast rbcL gene, ITS region of nuclear.ribosomal DNA) and a morphological data set of 47 characters. Up to IS.samples of other families of Ericales sensu the Angiosperm Phylogeny.Group were employed as outgroups. The results strongly support the.monbphyly of the family. Dispersal-vicariance analysis and Fitch.parsimony optimization support a Eurasian origin of the Styracaceae,.with subsequentdispersiontotheAmericas. Thisscenarioisconsistentwithahypothesized European origin for the family based on the fossilrecord. The eastern Asian—eastern North American disjunct genus.Halesia is not supportedasmonophyletic. The sole Asian species of thisgenus groups withtheAsiangenusRehderodendron, whereas the twoNorth American species most often form parts of polytomies with othergenera. The generally nested placementofthewarm-temperatedeciduousspecies of Styrax within theamphi-Pacific tropical evergreen group is consistent with an initial spread ofthegenusacross the North Atlantic landbridge as part of the Eocene bor eotropical flora and subsequentintercontinental dispersion ofderivedwarm-temperate-adaptedelements.Keywords:Styracaceae,phylogeny and biogeography, rbcL, trnL,ITS region.

在现有研究的基础上进一步补充和完善安息香料的系统发育资料，分析其各种形态和分子性状的变异规律和进化趋势，探讨其系统位置和各属的演化关系，建立分类系统；结合化石证据,运用生物地理学方法探讨安息香料的进化历史和现代分布格局的形成等。本课题对研究柿树目的系统演化和第三纪以来北半球有花植物间断分布的形成具有重要意义。