25715.中藥遠志遺傳多樣性的issr分析_第1頁
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1、西北大學(xué)碩士學(xué)位論文中藥遠志遺傳多樣性的ISSR分析姓名：李佳申請學(xué)位級別：碩士專業(yè)：植物學(xué)指導(dǎo)教師：趙桂仿20100603ISSRanalysisonpopulationgeneticdiversityofyuanzhiAbstractInthepresentstudyISSR(intersimplesequencerepeat)molecularmarkerswereemployedtoinvestigatethegeneticdi

2、versitywithinandamongwildpopulationsofPolygalatenuifoliaandPsibiricaandcultivatedpopulationsofPtenuifoliaTheanalysesof25wildpopulationsofthetwopolygalasshowed：(1)BoththeUPGMAclusteranalysisandthePCoAanalysisdisplayedacle

3、arseparationofthetwospecies；(2)ManyindicatorsfordiversitysuchasPPBdisplayedthatthegeneticdiversityofthetwospeciesWasrelativelyhigh；(3)Atlargegeographicalscalesthegeneticdistancesbetweenthetwospecies’populationsweresignif

4、icantlypositivelycorrelatedtothecorrespondinggeographicaldistances，whichWasconsistent、^，inltheisolation—bydistancemodelAccordingtotheaboveresultssomeimplicationsfortheconservationofthetwopolygalaswerediscussed：(1)Findpop

5、ulationsofthetwospeciesinlargesizewithinnaturereservescurrentlyestablishedandmake／nsituconservation；(2)GrowmoreherbsasthesubstitutionforwildonesTheanalysesof5wildand5cultivatedpopulationsofPtenuifoliafromthemainproductio

6、nareasshowed：(1)BoththeUPGMAclusteranalysisandthePCoAanalysisdisplayedthatthewildpopulationandthecultivatedpopulationfromthesamegeographicalareawouldbeclusteredfirst，indicatingthatcultivatedpopulationsisderiveddirectlyfr

7、omnearwildones；(2)Atsmallgeographicalscalesthegeneticdistancesbetweenpopulationsofthespecieshavenosignificantlypositiverelationships、航ththecorrespondinggeographicaldistances；(3)ThegeneticdiversityofcultivatedpopulationsW

8、aslowerthanthatofwildones，whichwascausedbytheextensivecultivationandbiologicalcharactersofthespeciesAccordingtotheaboveresultsitWassuggestedthatseedbreedingofthecultivatedpolygalashouldbedeveloped，andtherelationshipbetwe

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