1Shouguang Vegetables Institute of China Agricultural University，Shouguang 262705，Shandong，China|2Shandong Vegetables Engineering Technology Research Center，Shouguang 262705，Shandong，China|3Institute of Vegetables and Crops，Jiangsu Academy of Agricultural Sciences，Nanjing 210014，Jiangsu，China
Abstract：Subgynoecious bitter melon（Momoridca charantia L.）line 09C-51，09C-54 and normal sexual line 09C-57 were crossed in this study．Female flower proportion within 50 nodes for each plant was counted．Through investigation and χ2 test of P1，P2，F1，F2，BC1P1 types in segregating population， found that the subgynoecious trait was controlled by one pair of incomplete dominant gene．Further more，by quantitative genetics analysis of the 09C-51，09C-57 and their P1，P2，Fl，F2 population，the subgynoecious inheritance was proved to correspond with major gene and polygene mixed inheritance model．The heritability of the major gene was 63.06% and that of polygenes was 26.96%.
