紫苏F2:3家系农艺性状的数量遗传分析OA

[Objective]The quantitative inheritance laws of plant height,internodes,branches,main spike length,grains per main spike,spikes per plant,biomass per plant,yield per plant and thousand-grain weight of Perilla frutescens F2:3 family were analyzed to provide a reference for breeding new Perilla varieties.[Method]9 agronomic traits of the F2:3 family structured from the cross combination of Z028 with small seeds(female parent)×Z396 with big seeds(male parent)were determined,and the optimal genetic models and genetic parameters of various agronomic traits were screened and estimated by using the major gene+polygene mixed inheritance model.[Result]The optimal genetic model for plant height,spikes per plant,biomass per plant and internodes of P.frutescens F2:3 was 2MG-ADI and controlled by two pairs of additive-dominant-epistatic major genes.The optimal genetic model for branches was 1MG-NCD and controlled by a pair of negative complete dominant major genes.The optimal genetic model for main spike length,grains per main spike,yield per plant and thousand-grain weight was MX2-ADI-ADI and controlled by two pairs of additive-dominant-epistatic major genes plus additive-dominant-epistatic polygenes.[Conclusion]Plant height,main spike length,yield per plant and thousand-grain weight of P.frutescens F2:3 family are of high heritability with stable inheritance and minimal influence from environmental factors,which indicates that the improvement of four traits should be given priority attention in breeding P.frutescens.In contrast,the branch number is of low heritability with unstable inheritance in offspring and greater influence from environmental factors.