Yield trait improvement of bay scallops following complete diallel crosses between different scallop stocks  

作　　者：张守都 李莉 吴富村 张国范 

机构地区：[1]Institute of Oceanology, Chinese Academy of Sciences

出　　处：《Chinese Journal of Oceanology and Limnology》2014年第1期1-7,共7页中国海洋湖沼学报（英文版）

基　　金：Supported by the National High Technology Research and Development Program of China(863 Program)(Nos.2012AA10A410,2010AA10A401);the National Natural Science Foundation of China(No.30800842);the Mollusc Research and Development Center(No.CARS-48);the Taishan Scholar Program of Shandong Province;the Climbing Program of Taishan Scholars of Shandong Province

摘　　要：This study describes the complete diaUel hybridization between newly introduced bay scallop stock （W） from Canada and local commercial stock （D） grown under laboratory conditions, in China. Larval survival and growth during all life stages （larvae, spat, and adult） were compared among hybrid （DW, WD） and purebred （DD, WW） populations. Significant heterosis was detected for survival during the larval stage （〉 1% of the mid-parent values）. The mean heterosis （Hm） varied in growth throughout the life span. More than 50% of the Hm values were positive and negative in the DW and WD groups, respectively. The influence of maternal effects and mating types （intrapopulation vs. interpopulation crosses） on growth for all life stages was not consistent. Larval survival did not differ significantly （P〉0.05） with maternal effect or mating type. In the harvest stage, shell length （SL）, shell height （SH）, shell width （SW）, and total weight （TW） were larger in the hybrid compared with the inbred groups. Positive Hm values were observed in SL （1.5%）, SW （5.8%）, and TW （12.3%）, and were more significant in the DW groups （6.1%, 4.5%, 6.8%, and 27.2%）. These results suggest that hybridization between two geographic populations is a good tool for improving bay scallop growth. However, unstable heterosis between the two populations requires further study.This study describes the complete diallel hybridization between newly introduced bay scallop stock(W) from Canada and local commercial stock(D) grown under laboratory conditions, in China. Larval survival and growth during all life stages(larvae, spat, and adult) were compared among hybrid(DW, WD) and purebred(DD, WW) populations. Signifi cant heterosis was detected for survival during the larval stage(>1% of the mid-parent values). The mean heterosis( H m) varied in growth throughout the life span. More than 50% of the H m values were positive and negative in the DW and WD groups, respectively. The infl uence of maternal effects and mating types(intrapopulation vs. interpopulation crosses) on growth for all life stages was not consistent. Larval survival did not differ signifi cantly( P >0.05) with maternal effect or mating type. In the harvest stage, shell length(SL), shell height(SH), shell width(SW), and total weight(TW) were larger in the hybrid compared with the inbred groups. Positive H m values were observed in SL(1.5%), SW(5.8%), and TW(12.3%), and were more signifi cant in the DW groups(6.1%, 4.5%, 6.8%, and 27.2%). These results suggest that hybridization between two geographic populations is a good tool for improving bay scallop growth. However, unstable heterosis between the two populations requires further study.

关 键 词：bay scallop HYBRIDIZATION growth HETEROSIS 

分 类 号：S917.4[农业科学—水产科学]