Chromosomal regions associated with segregation distortion in maize

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1、TheorApplGenet(2002)105:622–628DOI10.1007/s00122-002-0970-9H.Lu·J.Romero-Severson·R.BernardoChromosomalregionsassociatedwithsegregationdistortioninmaizeReceived:15December2001/Accepted:16February2002/Publishedonline:19June2002©Springer-Verlag2002AbstractSegregationdistortionskewsthegenotypicence

2、ofsegregationdistortionregions(SDRs).ThreefrequenciesfromtheirMendelianexpectations.Ourob-knowngametophyticfactorsarepossiblegeneticcausesjectivesinthisstudyweretoassessthefrequencyofoc-oftheseSDRs.Asshowninpreviousresearch,segrega-currenceofsegregationdistortioninmaize,identifytiondistortiondoe

3、snotaffecttheestimateofmapdis-chromosomalregionsconsistentlyassociatedwithsegre-tancewhenonlyonegametophyticfactorispresentinangationdistortion,andexaminetheeffectsofgametophyt-SDR.icfactorsonlinkagemapping.Weconstructedasimplesequencerepeat(SSR)linkagemapforaLH200/LH216KeywordsSegregationdistor

4、tion·Maize·Linkagemap·F2Syn3(i.e.,random-matedthreetimes)population,andGametophyticfactorcomparedthesegregationdistortioninthismapwiththesegregationdistortioninthreepublishedlinkagemaps.Among1,820codominantmarkersacrossthefourmap-Introductionpingpopulations,301(17%)showedsegregationdistor-tion(P

5、<0.05).ThefrequencyofmarkersshowingThelawofsegregation,whichisthemostfundamentalsegregationdistortionrangedfrom19%inthelawinMendeliangenetics,relieson:(1)apredictableTx303/CO159mappingpopulationto36%inthetransmissionofallelesfromaparenttoitsoffspring,andB73/Mo17mappingpopulation.Apositiverelatio

6、nship(2)apredictableformationofgenotypesfromthetrans-wasfoundbetweenthenumberofmeiosesandthefre-mittedalleles.Segregationdistortion,whichisdefinedasquencyofsegregationdistortiondetectedinapopula-adeviationoftheobservedgenotypicfrequenciesfromtion.Onagivenchromosome,nearlyallofthemarkerstheirexpe

7、ctedvalues,violatesthelawofsegregationandshowingsegregationdistortionfavoredtheallelefromrendersconventionalgenetictheoryandanalysistobethesameparent.Atotalof18chromosomalregionsoninvalid.thetenmaizechromosomeswereassociated