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1、植物分类学报44(2):126–134(2006)doi:10.1360/aps040077ActaPhytotaxonomicaSinicahttp://www.plantsystematics.com基于ITS序列和trnL-F序列探讨小叶锦鸡儿、中间锦鸡儿和柠条锦鸡儿的种间关系*侯鑫刘俊娥赵一之赵利清(内蒙古大学生命科学学院呼和浩特010021)InterspecificrelationshipsofCaraganamicrophylla,C.davazamciiandC.korshinskii(Leguminosae)basedonITSandtrnL-FdatasetsHOUXi
2、nLIUJun-EZHAOYi-Zhi*ZHAOLi-Qing(CollegeofLifeSciences,InnerMongoliaUniversity,Huhhot010021,China)AbstractThetaxonomictreatmentofCaraganadavazamciiSancz.hasbeenacontroversialmatter,asitsrelationshipwithC.microphyllaLam.andC.korshinskiiKom.isnotclear.Itwastreatedasanindependentspecies,oravarietyunde
3、rC.microphyllaorC.korshinskii.ThisstudyistoexaminetheinterspecificrelationshipofthesethreespeciesandtheoriginofC.davazamciibasedoninternaltranscribedspacer(ITS)andnon-codingregionofchloroplasttrnL-F,combinedwithmorphologicaldataandgeographicaldistribution.ThetrnL-FsequenceofC.davazamciiisidentical
4、tothatofC.microphyllabutdiffersdistinctlyfromthatofC.korshinskii.ThehighcongruenceofITScopiesthroughbothdirectandcloningsequencingrejectstherecenthybridizationhypothesisofC.davazamciibetweenC.microphyllaandC.korshinskii.Incontrast,twodifferentITSsequencecopieswerefoundrespectivelyineachindividualo
5、fC.microphyllaandC.korshinskii.OneofthetwoITSsequencesinC.microphyllaisidenticaltothatofC.davazamcii.ThisresultindicatesthatC.davazamciimighthavetakenpartinthehybridizationofC.microphyllaasoneparent,orthatextensivegeneflowmighthaveoccurredbetweenthesetwospecies,thusresultinginthemorphologicalsimil
6、arityofthem.However,thesimilarityofsomemorphologicalcharactersofC.davazamciitothoseofC.korshinskiimightresultfromtheconvergentadaptationtotheircommonecologicalenvironment.KeywordsCaraganamicrophyllaLam.,CaraganadavazamciiSancz.,CaraganakorshinskiiKom.,ITS,trnL-F.摘要中间锦鸡儿CaraganadavazamciiSancz.的分类处
7、理一直存在争议,它与小叶锦鸡儿C.microphyllaLam.和柠条锦鸡儿C.korshinskiiKom.的关系尚不清楚。该种被处理为一个独立的种或后两个种的变种。本文利用ITS序列和叶绿体trnL-F序列,综合形态和地理分布,探讨了中间锦鸡儿的起源及与另外两个种的种间关系。结果显示,中间锦鸡儿的trnL-F序列与小叶锦鸡儿完全一致,而与柠条锦鸡儿有明显差异。中间锦鸡儿的ITS序列高度纯合,不支持该种可能是杂交起源的
