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1、南方農(nóng)業(yè)學報JournalofSouthernAgrieuhure2014,45(6):944—949ISSN2095—1191;CODENNNXAABDOI:10.3969/j:issn.2095—1191.2014.6.944大豆RACKI基因RNAi載體構建及植株轉化李大紅1,劉喜平1,甄萍萍2(1黃淮學院生物工程系,河南駐馬店463000;2臨邑縣農(nóng)業(yè)局,山東臨邑251500)摘要:【目的】篩選大豆RACKl基因的RNAi突變體,為研究RACKl基因在大豆生長發(fā)育過程的調控作用提供依據(jù)。【方法】采用RT—PCR克隆大豆葉片RACKl基因核心保守序列片段,以植物表達載體pCAMBIA
2、l301為基本載體,構建抑制大豆RAc圈基因表達的RNAi載體。通過農(nóng)桿菌介導轉入大豆子葉節(jié),經(jīng)潮霉素篩選轉基因植株,利用PCR、Southernblot及RT—qPCR進行轉基因植株檢測?!窘Y果】克隆獲得大豆RACKl基因核心保守序列片段432bp;將該基因片段連接:至IjpCAMBIAl301表達載體內含子兩側,通過酶切分析,RNAi載體構建正確。通過農(nóng)桿菌介導,將該載體轉入大豆中黃13號,獲得23個轉基因大豆株系;經(jīng)PCR和Southernblot檢測,確定大豆RACKl基因RNAi片段已融合到大豆基因組中。經(jīng)定量RT—qPCR分析,不同轉基因大豆株系RACKl基因mRNA的表達量具
3、有明顯差異,其在株系5的表達量最高,為對照的68.5%;株系7最低,降至對照的19.9%?!窘Y論】成功構建了大豆RACKlRNAi表達載體并導人大豆基因組中,獲得23個農(nóng)桿菌介導的RACKlRNA干擾表達的大豆轉基因植株,為研究RACKl基因在大豆生長發(fā)育過程中的功能和作用奠定了基礎。關鍵詞:大豆;RACKl;RNAi;載體構建;Southernblot;RT—qPCR中圖分類號:$565.1文獻標志碼:A文章編號:2095—1191(2014)06—0944—06ConstructionofRNAivectorcarryingRACKIgeneandtransformationinsoy
4、beanLIDa—hong1.LIUXi—ping1.ZHENPing—pin92(1DepartnlentofBiologicalEngineering,HuanghuaiUniversity,Zhumadian,Henan463000,China;2AgriculturalBureauofLinyiCounty,Linyi,Shandong251500,China)Abstract:【Objective】TheRNAinmtantofsoybeanRA皤1genewasscreenedinordertoprovidereferencesforstudyingregulationrole
5、ofRACKjgeneintheprocessofsoybeangrowthanddevelopment.【Method]Theconservedse—quenceofRACKlinsoybeanleafwasclonedbyRT—PCR.ARNAiexpressionvectortoinhibitRACKlexpressionwasconstructedbyusingplantexpressionvectorpCAMBIAl301.RACKlgenewastransterredintoeotyledonarynodeofsoybeanZhonghuang13viaAgrobacteriu
6、m——mediatedtranstbmlationmethod.TransgenicseedlingswasscreenedbyhygromycinandwasdetectedbyPCR,SouthernblotandRT—PCR.【Result】TheclonedsoybeanRAG圈genefragmentwas432bp.ThegenefragmentwasconnectedtobothsidesofintroninexpressionvectorpCAMBIAl301.ThroughrestrictionenzynledigestionanalysisandDNAsequencin
7、g.itshowedthatalltherecombinantplasmidswereaccordingwiththedesignandRNAivectorwasconstructedcorrectly.ByA,grobacterium—mediated.theconstructedRNAivectorwastransf()mlatedintosoybeanZhonghuang13and23transgeniclines