文档介绍：CHAPTER6HybridizationBreeding杂交育种Hybridization–CrossingSexualCrossingAsexualCrossingDistantCrossing-rossing–inter-varietalCrossingInthischapter:?(s)TypesofCrossBreeding:§1TheConceptionandSignificanceofCrossBreeding :Accumulationofminorpoly-genesSignificanceofCrossBreedingThemostwidelyusedbreedingmethodinpresentThemostfruitfulbreedingmethodinpresent()binedusewithotherbreedingmethods§binationofParents 亲本选择和选配SelectionofParents亲本选择TheImportancePre-(1)essfulbreeding:(2)Principles1)Moreadvantages,plementary2)icdifferences3)biningability:GCA:AdditivegeneeffectsSCA:Heterosiseffects(non-additive)Goodcultivarsarenotalwaysgoodparents4)Salientobjectivecharactersinoneorbothparents,withahighinheritability5)-1,§3ModesofCrossandtheTechniques :bination(1)SingleCrossA×BorA/B(CytoplasmfromA)B×AorB/A(CytoplasmfromB)(2)MultipleCross1)Threewaycross(A×B)×CorA/B//C(CytoplasmofA,C=1/2)2)DoubleCross(A×B)×(C×D)orA/B//C/D(A×B)×(A×C)orA/B//A/C(A=1/2)3)TetraCrossA/B//C/3/D(D=1/2)4)ConvergentCrossA/B//C/D/3/E/F//G/H(3)BackcrossA/B//AA/B//B(4)MultipleParentalCrossA/(B+C+D+E)(1)Regulation/timingoffloweringstages(2)Emasculation(3)Pollination(4)Postmanagement