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Morphometric, phylogenetic and biogeographic analyses of pyrularia（Santalales）, a parasitic disjunct lineage between eastern Asia and eastern North America

Morphometric, phylogenetic and biogeographic analyses of Pyr...

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中国植物学会第十六次全国会员代表大会暨85周年学术年会

作者： Zhuo Zhou Jin-Jin Hu Jun Wen Hang Sun Key Laboratory of Biodiversity and Biogeography Kunming Institute of BotanyChinese Academy of Sciences Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical GardenChinese Academy of Sciences Department of Botany National Museum of Natural HistorySmithsonian Institution

pyrularia is a small parasitic genus of the Santalales with two to five species exhibiting a well-known classical intercontinental disjunct distribution between eastern Asia（EA） and eastern North America（ENA）.pyrularia and another santalaceous genus Buckleya represent the only two parasitic plant lineages with the EA–ENA *** present study was carried out to assess the species number,and molecular and morphological differentiation in pyrularia,and to reconstruct the biogeography of the pyrularia clade（pyrularia and its close allies） using dating and biogeographic inferences.A phylogenetic analysis based on two nuclear and seven plastid markers strongly supported the monophyly of pyrularia and revealed two highly distinct subclades corresponding to EA and ENA within the *** topologies within the eastern Asian lineage were found between the nuclear and the plastid datasets,which may be attributed to incomplete lineage *** and phylogenetic analyses suggest that pyrularia in eastern Asia may best be treated as a single species,*** dating based on four markers suggested that the divergence time between the intercontinental species was in the late Miocene at 5.58 Ma（95% HPD: 2.08–11.72 Ma）,which was very close to the split of the trans-Pacific clades within the other parasitic EA-ENA disjunct genus *** EA–ENA disjunction in the only two parasitic genera may have resulted from the fragmentation of the mesophytic temperate forests in the late *** pyrularia clade（including the close allies of pyrularia） was inferred to have originated in Africa,then dispersed to Asia,and subsequently to North America via the Bering land bridge,resulting in the current intercontinental EA-ENA distribution of pyrularia.

关键词： pyrularia Buckleya parasitic plants eastern Asian–eastern North American disjunction historical biogeography Santalales

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