Combining ability for yield and plant phenology.pdf
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Combining ability for yield and plant phenology.pdf

Combiningabilityforyieldandplantphenology.pdf

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Euphytica104:151–158,1998.151©1998KluwerAcademicPublishers.PrintedintheNetherlands.Combiningabilityforyieldandplantphenologyinplantain-derivedpopulations1,2A.Tenkouano∗,R.Ortiz&D.Vuylsteke1IITAc/oLambournandCo.,CarolynHouse,26DingwallRoad,CroydonCR93EE,U.K.;2presentaddress:TheRoyalVeterinaryandAgriculturalUniversity(KVL),DepartmentofAgriculturalSciences,40Thorvaldsensvej,DK-1871FrederiksbergC,Copenhagen,Denmark;(*authorforcorrespondence)Received19October1997;accepted21June1998Keywords:Musaspp.,4x-2xbreedingscheme,parentalselection,breedingvalue,nonallelicinteractions,cropcyclingefficiencySummaryGeneticenhancementofMusaspp.hasaimedatproducinghybridswithhighyield,shortstature,fastcropcycling,anddiseaseresistancethroughinterspecificandinterploidycrosses.ProgenytestingforparentalselectionhasseldombeencarriedoutinMusaandlittleisknownoncombiningabilityandheterosisinthisspecies.A55factorialmatingdesignwasusedtoestimatecomponentsofphenotypicvariancein4x-2xhybridpopulations×andtodeterminethecombiningabilityoftheirprogenitorsforyieldandassociatedtraits.Generalcombiningabilitywasmuchgreaterthanspecificcombiningabilityforthesetraits,and,therefore,onlylittlerecombinativeheterosiscouldbeexpecteduponcrossing.Thus,the4x-2xbreedingschemeshouldaimtoaccumulatefavourableallelesin4xand2xclonesthroughrecurrentselection.Suchclonescouldbeusedperseorincrossesaimedatrestoringtheseedlessnesscharacterintheprogenyduetofemalesterilityinatriploidbackground.Introductionderstood(Ekanayakeetal.,1994;Robinson&Nel,1985,1986;Robinsonetal.,1992;Turner&Lahav,Plantainsandbananas(Musaspp.L.)areimportant1983),butcomparativelylittleisknownabouttheirstapleandcommercialcropsworldwide,buttheirgeneticbasis.Forexample,thetimeintervalbetweengeneticimprovementthroughartificialselectionhastwoconsecutiveharvestsisdeterminedbysuckeringprovendifficultduetoalimitedunderstandingofbehaviour,atraitwhichisitselfundercontrolofgib-thegeneticorganizationandmeioticbehaviouroftheberrelicacid(GA3)prod