Genetic and Heterosis Analysis for Root Width and Length in Carrot (Daucus carota L.)

By using an additive-dominance genetic model with genotype and environments interaction,the genetic and heterosis for carrot root width and length were investigated with 19 varieties(or inbreeding lines)and their 16 F1 crosses.It was indicted that additive variance(VA)and additive environment interaction variance(VAE)were major genetic components for root width,and VA and dominance environment interaction variance(VDE)were major genetic components for root length.The general narrow sense heritabilities were higher than interactive narrow sense heritabilities for root width and length.The negative value for hybrid heterobeltiosis indicted that root width and length couldn't be increased by utilizing heterosis,but be improved by using some special types of parents in carrot breeding.