low genetic diversity and local adaptive divergence of

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1、PlantBiologyISSN1435-8603RESEARCHPAPERLowgeneticdiversityandlocaladaptivedivergenceofDracaenacambodiana(Liliaceae)populationsassociatedwithhistoricalpopulationbottlenecksandnaturalselection:anendangeredlong-livedtreeendemictoHainanIsland,China1,2121,2D.-J.Zheng,L.-S.Xie,J.-H.Zhu&Z.-L.Zhang1

2、KeyLaboratoryofCropGeneticsandBreedingofHainanProvince,HainanAcademyofAgriculturalSciences,Haikou,China2InstituteofTropicalBioscienceandBiotechnology,ChineseAcademyofTropicalAgriculturalSciences,Haikou,ChinaKeywordsABSTRACTDracaenacambodiana;geneticdiversity;historicalpopulationbottleneck;l

3、ocalHistoricalpopulationbottlenecksandnaturalselectionhaveimportanteffectsonadaptivedivergence;naturalselection;thecurrentgeneticdiversityandstructureoflong-livedtrees.Dracaenacambodianapopulationdifferentiation.isanendangered,long-livedtreeendemictoHainanIsland,China.Ourfieldinves-tigations

4、showedthatonly10populationsremainonHainanIslandandthatalmostCorrespondenceallhavebeenseriouslyisolatedandgrowindistincthabitats.AconsiderableZ.-L.Zhang,KeyLaboratoryofCropGeneticsamountofgeneticvariationatthespecieslevel,butlittlevariationatthepopula-andBreedingofHainanProvince,Hainantionle

5、vel,andahighlevelofgeneticdifferentiationamongthepopulationswithAcademyofAgriculturalSciences,HaikoulimitedgeneflowinD.cambodianaweredetectedusinginter-simplesequence571100,ChinaandInstituteofTropicalrepeat(ISSR)andrandomamplifiedpolymorphicDNA(RAPD)analyses.Nosignifi-BioscienceandBiotechnolog

6、y,Chinesecantcorrelationwasfoundbetweengeneticdiversityandactualpopulationsize,asAcademyofTropicalAgriculturalSciences,thegeneticdiversitiesweresimilarregardlessofpopulationsize.TheManteltestHaikou571101,China.revealedthattherewasnocorrelationbetweengeneticandgeographicdistancesE-mail:zzl_c

7、atas@hotmail.comamongthe10populations.TheUPGMA,PCoAandBayesiananalysesshowedthatlocaladaptivedivergencehasoccurredamongtheD.cambodianapopulations,Editorwhichwasfurthersupportedbyhabitat-privatefragments.Wesuggestthatthecur-T.Peetersrentgeneticdiversityan