transgressive segregation phenomena in breeding of crop plants

sometimes when hybridization in quantitative traits due to occurring of transgressive segregation phenomena in f2 and other generations, phenotypes are observed that are outside the scope of their parents. transgressive segregates can be fixed via selfing and selection. classical genetic and qtl studies know complementary action of genes as the main reason for the occurrence of the above phenomenon. the transgressive segregation phenomena through cross between parents with a positive and significant gca values for all traits are somewhat predictable. it seems, to increase the likelihood of this phenomenon, bulk single seed and recurrent selection among breeding methods are the most effective methods. transgressive segregation phenomena are widely used in the improved of various quantity characteristics such as tolerance to stresses such as cold, heat, drought and salinity.