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| Diallel Crosses between Cow Color Strain and Ocean-orange Color Strain of Manila Clam Ruditapes philippinarum |
| ZHANG Hui,YAN Xiwu,ZHANG Yuehuan,GAO Xin,YAO Tuo,YANG Feng,ZHANG Guofan |
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Abstract The heterosis of growth ,survival ,and genetic mechanism of shell color were investigated in diallel crosses between F2 cow color clam (C) and F4 ocean-orange color clam (O) by two self-fertilized group (CC ,OO) and two hybrid group (CO ,OC) of Manila clam (Ruditapes philippinarum) in order to improve the phenotypic characters of Manila clam in August of 2011 .The results showed that the single-parental heterosis was asymmetrical between the two reciprocal crosses . The value of mid-parental heterosis was found to be 2 .13 in growth ,and that of single-parental heterosis were -1 .62 for CO ,and +6 .07 for OC ,which was mainly affected by interact effect during planktonic stage .The value of mid-parental heterosis was found -5 .43 ,and that of single-parental heterosis +4 .79 for CO ,and -13 .80 for OC during juvenile stage .Considering survival ,the value of mid-parental heterosis was -8 .06 ,and that of single-parental heterosis was -12 .67 for CO ,and -3 .43 for OC ,which was mainly affected by egg origin effect ,followed by the mating strategy .The value of mid-parental heterosis was 0 .60 ,and that of single-parental heterosis were -0 .77 for CO ,and 1 .61 for OC during juvenile stage . The progenies showed black splashes color for C × C ,orange splashes color for C × O and O × C ,and orange color for C × C in shell color .
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Received: 25 February 2014
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