)sequenceanalysissoftwarewasusedforsequenceBiosoft
[9]
analysisandevolutiontreeconstruction.PCRamplificationofRNAiinterferencefragments ThesequencedRNA2genomesequencewasanalyzedandtheconservedregionsindentifiedtodesignandsynthesizeprim?,andthegenefragmentpreservedontheT?vectorwasersusedasatemplate,thetwopairsofprimersCR2?Kp/CR2?SBandCR2?Bg/CR2?SBwereusedtoamplifytheinterferenceAgriculturalScience&TechnologyVol.11,No.5,2010
acidhomologywasof71.3%-98.8%and74.0%-98.5%
(Table3),inwhichtheNS04isolatehadhighhomologywithPhylineswhichwasfromZhejiangofChina,theGenbanknumberwasDQ412731(Fig.2),thenucleotideandamin
o
fragmentPCR_CR2_BKandPCR_CR2_SB.ConstructionofpBi35SCR2expressionvector AftertheamplifiedPCR_CR2_BKwasrecoveredwithBamHⅠandKpnⅠd
igestion,thecorrespondingdigestedpiRDG12siteswereinserted
,andthenthepiRD_CR2.Sfirstintermediatevectorwasobtained(Fig.1A).TheamplifiedPCR_CR2_SBwasrecoveredwithBglⅡandSacⅠd
igestion,andthecorre?spondingdigestedpiRD_CR2.Ssiteswereinserted
,andthenthepiRD_CR2secondintermediatevectorwasgained(Fig.1B).AfterthepiRD_CR2vectorwasdigestedwithXbaⅠandEcoRⅠ,thesmallfragmentwasinsertedwiththecorrespond?ingsitesofdigestedpBi35SG12,andfinallythepBi35SCR2
expressionvectorwasobtained(
Fig.1C),thedesignofvec?torwascompletedwithVectorNTIassist
.
Fig.1 ConstructionofpiRD?CR2.S(A),piRD?CR2(B)and
pBi35SCR2
(C)expressionvectorGenetictransformationtotobacco Theconstructed
pBi35SCR2expressionvectorwastransformedintoAgrobac?teriumtumefaciensGV3101,theNicotianatobacco(Nt)leav?eswerecutinto1cmofleafdisc,whichwerethenmixedwithAgrobacteriuminfectionliquidfor5-10minofsoaking,the
excessbacterialiquidwasremovedanddried,andthentheywereplacedontheco?culturemedium(
MS+0.5mg/Lof6?BA),aftercultivatedindarkfor1-3d,theyweretrans?
ferredtothedifferentiationmedium(
MS+0.5mg/Lof6?BA+50.0mg/Lof
Kan+300.0mg/LofCar)fortheinductionofregenerationbud.Whentheregeneratedshootlengthwasabout1.5-2.0cm,theregenerationshootwascutoffand
transferredtorootingmedium(
MS+0.1mg/LofIAA+50.0mg/LofKan+300.0mg/LofCar)fortheinductionofroots.
ResultsandAnalysis
CloningandsequenceanalysisofCMVRNA2genome
PrimersCMV2SP1/CMV2ASP2,CMV2SP3/CMV2ASP4
wereusedtoamplifythefragmentsof1553and1378bp
,af?terthealignmentsandsplicing,partsofCMVRNA2genomicfragmentwith2864bpwereobtained,andthesepartscon?tainedthenucleotidesequencewhichcouldencodeCMV2a
replicaseproteinandCMV2bprotein
,bytheuseofDNAMANsoftware,thecomparisonofCMV2afragmentsofNS04iso?lateandotherisolates(GenbanknumberandoriginwereshowninTable2)suggestedthattheirnucleotideandamino