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1、ANGIOSPERMPHYLOGENY:17GENES,640TAXA1AmericanJournalofBotany98(4):704–730.2011.一、前言背景二、材料与方法三、结果四、讨论一、前言背景Premiseofthestudy:Recentanalysesemployinguptofivegeneshaveprovidednumerousinsightsintoangiospermphylogeny,butmanyrelationshipshaveremainedunresol
2、vedorpoorlysupported.Inthehopeofimprovingourunderstandingofangiospermphylogeny,weexpandedsamplingoftaxaandgenesbeyondpreviousanalyses.Soltisetal.,1999,2000——the567-taxon,three-gene(rbcL,atpB,and18SrDNA)Hiluetal.(2003)——conductedabroadanalysisofangios
3、permsbasedonmatKsequences,withresultsthatagreedcloselywiththethree-genetopologyDaviesetal.(2004)——constructedasupertreeforangiosperms.Soltisetal.(2007)——undertookaBayesiananalysisofthe567-taxon,three-genedatasetandobtainedatopologynearlyidenticaltoth
4、atobtainedwithparsimony.Belletal.(2010)——usedaBayesianrelaxedclockmodeltoanalyzethissamethree-genedatasetandfoundresultssimilartoSoltisetal.(2007).Burleighetal.(2009)——usedfivegenesforthesame567taxaanalyzedinSoltisetal.Thefive-genematrixhadsignifican
5、tlymoremissingdata(27.5%)thanthethree-genematrix(2.9%),butthefive-geneanalysisresultedinhigherlevelsofbootstrapsupportacrossthetree.Thevalueofconstructingdatasetsofmanygenesemployednearlycompleteplastidgenomesequencedata(e.g.,Leebens-Macketal.,2005)l
6、imitedinsamplingtofewerthan100taxabasedonmanygenesbutfocusedonlyonmajorangiospermcladesThevalue——withverylargeamountsofdata(i.e.,13to83genes),many,ifnotmost,deep-levelquestionsofangiospermphylogenycanberesolved.(e.g.,Schönenbergeretal.,2005;Jianetal.
7、,2008;H.Wangetal.,2009;Brockingtonetal.,2010;TankandDonoghue,2010）Thegoal:assembleadatasethavingbothbroadtaxonomiccoverageandnumerousgenes.1、Thethree-andfive-geneanalysesof567taxahavebroadtaxonomiccoverage,supportformanyportionsoftheframeworkofangios
8、permphylogenyislowinthesestudies.2、Conversely,studiesemployingcompleteplastidgenomesequenceshavedeepgenecoverageandstronginternalsupport,buttaxonomiccoverageisoftensparse.Inthistext:1、usinggenesthatrepresentallthreeplantgenomiccompartments：nucleus,pl
