资源描述：
《x environment interactions oregon state 基因型与环境的相互作用俄勒冈州课件》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、PBG650AdvancedPlantBreedingModule13:BreedingforDiverseEnvironmentsGenotypexEnvironmentInteractionsGenotypebyenvironmentinteractionGenotypesresponddifferentlyacrossarangeofenvironmentsi.e.,therelativeperformanceofvarietiesdependsontheenvironmentGXE,GEI,GbyE,GEGe
2、notypebyenvironmentinteractionsarecommonformostquantitativetraitsofeconomicimportanceAdvancedbreedingmaterialsmustbeevaluatedinmultiplelocationsformorethanoneyearMET=multi-environmenttrialsP=G+E+GETypesofGEIInteractionmaybedueto:heterogeneityofgenotypicvariance
3、acrossenvironmentsimperfectcorrelationofgenotypicperformanceacrossenvironmentsnoncrossovercrossoverTheGEIchallengeEnvironmentaleffectisthegreatest,butisirrelevanttoselection(remember70-20-10rule,E:GE:G)Manystatisticalapproachesconsiderallofthephenotypicvariatio
4、n(i.e.,meansacrossenvironments),whichmaybemisleadingNeedanalysesthatwillhelpyoutocharacterizeGEI"GEInteractionisnotmerelyaproblem,itisalsoanopportunity"(Simmonds,1991).SpecificadaptationscanmakethedifferencebetweenagoodvarietyandasuperbvarietyTheGEIchallengeSom
5、eenvironmentalvariationispredictablecanbeattributedtospecific,characteristicfeaturesoftheenvironmente.g.,soiltype,soilfertility,plantdensitySomevariationisunpredictablee.g.,rainfall,temperature,humidityQuestionsabreedermayaskHowdoIchoosesuitableenvironmentsfort
6、esting?HowdoIallocateresources(numberoftestingsitesvsreplicateswithinsites)?Ingeneral,increasingenvironmentsdoesmoretoreducethestandarderrorofgenotypemeansthanincreasingreplicationsConventionalANOVARatiosofSumsofSquares(SS)canbeusedtoestimatethecontributionofin
7、teractionstothetotalSSCanalsoestimatevariancecomponentsduetoGXEMixedModelsforanalysisofMETForevaluationofGEIamonganelitegroupofcultivars,genotypesareoftenconsideredtobefixedeffectsandenvironmentsarerandom.TheGEIcomponentisrandom.OnecanobtainBLUPestimatesofGEIef
8、fects.ForthepurposeofestimatingbreedingvaluesusingBLUP,genotypesareconsideredtoberandomandenvironmentsarefixedeffects.Somestatisticiansbelievethatgenotypesshouldalwaysberand
