Abstract: Using 83 seedlings of 4 crosses between genotypes of DwdwSs and dwdwss, 18 seedlings of 1 cross between genotypes of Dwdwss and DwdwSs, we analyzed the segregation of the two peach traits based on the progenies. The results showed dwarf growth habit and flat fruit shape are qualitative inheritance. Dwarf growth habit is a recessive characterwhile flat fruit shape is dominant. In p rogenies of the cross combinations of DwdwSs ×dwdwss or dwdwss ×DwdwSs, there were no dwarf flat peach and non-dwarf round peach observed. The segregation ratio of Dw_Ss and dwdwss was 1∶1. The two pairs of allelic gene were isolated with Mendelian ratio independently. We also failed getting dwarf flat peach in the cross combination of DwdwSs ×
Dwdwss, in progenies of which the segregation ratio of Dw _ Ss∶Dw _ ss∶dwdwss was 2∶1∶1. Based on above results, we supposed that dwarf tree ( dw ) was completely linked with round peach fruit (s) , while flat peach fruit (S) was linked with non-dwarf tree (Dw). The dwarf gene and the gene controlled the flat fruit shape was located in different homologous chromosomes and there was no crossover happened. As a result, there was no dwS gamete produced.

Key words: Flat peach, Dwarf, Breeding, Complete linkage, Inherent