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Molecular phylogeny of Solms-laubachia(Brassicaceae) s.l.,based on multiple nuclear and plastid DNA sequences,and its biogeographic implications

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Journal of Systematics and Evolution 2009年第5期47卷 402-415页

作者： David A.BAUM ihsan a.al-shehbaz Richard REE Department of Botany University of Wisconsin Missouri Botanical Garden PO Box 299St LouisMO 63166-0299USA 3. Department of BotanyThe Field Museum1400 S.Lake Shore DriveChicagoIL 60605USA

The Hengduan Mountains region of south-west China is a noted biodiversity hotspot,but the geographic origins and historical assembly of its rich endemic flora,including the sky-island species of Solms-laubachia Muschl.(Brassicaceae),have been little *** molecular studies on the phylogeny of Solms-laubachia showed it to be paraphyletic,leading to considerable expansion not only of its taxonomic limits,but also its geographic range,with the inclusion of taxa from outside the Hengduan ***,these studies provided little resolution of interspecific relationships,preventing inferences about historical biogeography within the *** the present study,new sequence data from two nuclear genes(LEAFY and G3pdh) and two chloroplast intergenic spacers(petN-psbM and psbM-trnD) were combined with existing markers to increase phylogenetic *** villosum(Maxim.) al-shehbaz was found to be nested within Solms-laubachia *** general,phylogenetic relationships appear to be a good predictor of geography,with the Hengduan Mountain endemics embedded in a paraphyletic grade of species from the western Himalayas and central Asia,but they also imply morphological *** was detected between the nuclear and chloroplast gene trees,perhaps resulting from incomplete lineage sorting of ancestral *** crown age of Solms-laubachia *** estimated to be approximately 1.42-3.68 mya,using Bayesian relaxed molecular clock *** biogeographic a.alysis using a parametric dispersal-extinction-cladogenesis model inferred central Asia and the western Himalayas as most probable ancestral range of Solms-laubachia s.l.,and estimated higher rates of eastward expansion than westward during the diversification of descendant *** summary,our results suggest that Solms-laubachia *** during the Pliocene in central Asia,and subsequently migrated eastward into the Hengduan Mountains,colonizing sky-island,alpine scr

关键词： biogeography Brassicaceae Hengduan Mountains phylogeny Solms-laubachia s.l.

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Molecular phylogeny reveals the non-monophyly of tribe Yinshanieae （Brassicaceae） and description of a new tribe, Hillielleae

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Plant Diversity 2016年第4期38卷 171-182页

作者： Hongliang Chen Tao Deng Jipei Yue ihsan A. AI-shehbaz Hang Su Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of Botany Chinese Academy of Sciences Kunming Yunnan 650201China University of Chinese Academy of Sciences Beijing 100049 China Missouri Botanical Garden P.O. Box 299 St. Louis MO 63166-0299 USA

The taxonomic treatment within the unigeneric tribe Yinshanieae （Brassicaceae） is controversial, owing to differences in generic delimitation applied to its species. In this study, sequences from nuclear ITS and chloroplast trnL-F regions were used to test the monophyly of Yinshanieae, while two nuclear markers （ITS, ETS） and four chloroplast markers （trnL-F, trnH-psbA, rps16, rpL32-trnL） were used to elucidate the phylogenetic relationships within the tribe. Using maximum parsimony, maximum likelihood, and Bayesian inference methods, we reconstructed the phylogeny of Brassicaceae and Yinshanieae. The results show that Yinshanieae is not a monophyletic group, with the taxa splitting into two distantly related clades： one clade contains four taxa and falls in Lineage 1, whereas the other includes all species previously placed in Hilliella and is embedded in the Expanded Lineage Ⅱ. The tribe Yinshanieae is redefined, and a new tribe, Hillielleae, is proposed based on combined evidence from molecular phy logeny, morphology, and cytology.

关键词： Brassicaceae Hilliella Hillielleae Phylogeny Yinshania Yinshanieae

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