LIANG Jian, DONG Ke-xun, YAN Xi-wu, HUO Zhong-ming, WU Yun-xia, YANG Feng
Engineering Research Center of Shellfish Culture and Breeding in Liaoning Province, College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China
Abstract: The 2×2 diallel cross of different shell color for Manila clamRuditapesphilippinarumstrains, two self-fertilized groups (OO, WW) and two hybrid groups (OW, WO) were conducted using orange strain (O) with orange shell color and white strain (W) with white shell color to investigate the heterosis of growth, survival, meramorphosis and shell color determinism for offsprings. The results showed the positive single-parents growth heterosis of WO was observed in all stages, the same as OW expected the juvenile stage. The hybrid groups own the certain degree mid-parents growth heterosis. There were strong middle and single parent survival heterosis in hybrid groups. On metamorphic stage, the positive heterosis of metamorphosis was observed. In a word, the heterosis of WO was larger than that OW. The egg origin (maternal) effects were the main factor influencing heterosis of growth and survival at all of stages. The shell color segregation ratio (orange∶white) of self-fertilized group for orange strain was 3∶1, and the hybrid groups was 1∶1. The results followed the mendel’s law, and it is suggested that orange be dominant to white. Shell color was controlled by simple genetic, and was not located at the same homologous chromosomes with control shell surface pattern or banding genetic. There was no gene linkage between shell color and shell surface pattern or banding genetic.
2014, Vol. 29 
