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Heterosis and combining ability evaluation for growth traits of blunt snout bream (Megalobrama amblycephala) when crossbreeding three strains
作者姓名:Wei Luo  Cong Zeng  Shaokui Yi  Nicholas Robinson  Weimin Wang  Zexia Gao
作者单位:College
基金项目:This work was supported by the Modern Agri- culture Industry Technology System Construction Projects of China titled as--Staple Freshwater Fishes Industry Technology System (CARS-46-05), National Natural Science Foundation of China (31201988), Projects of Hubei Cooperation and Exchanges (2013BHE006), Wuhan Engineering Research Center of Breeding for Wuchang Bream, National Ministry of Science and Technology Support Program (2012BAD26B00), State Key Laboratory of Freshwater Ecology and Biotechnology of China (2012FB06), Excellent Youth Foundation of Hubei Scientific Committee (2013CFA032), and Fundamental Research Funds for the Central Universities (2013PY066).
摘    要:The blunt snout bream(Megalobrama amblycephala)is a major aquaculture species in the Chinese freshwater polyculture system.In this study,complete diallel crossing of three strains(i.e.,LiangziLZ],PoyangPY]and YuniYN])was used to evaluate the combining ability and heterosis effect of intraspecific crossbreeding on the growth performance(i.e.,body weight,total length,body length,body height,and Fulton’s coefficient of condition).The offspring produced from the three strains were reared in a communal pond for 20 months,and nine microsatellites were used to assess their pedigree.Of the749 offspring,708(94.53%)could be assigned directly to a single parental pair.Significant differences were observed in body weight(BW)among the different combinations,indicating that the combining ability of BW from each strain was significantly different.The general combining ability(GCA)of BW from the sire was much higher than that from the dam.The GCA for the dam and sire of the LZ and YN were the largest and the smallest,respectively.The special combining ability of YN$9 PY#was the largest,and YN$9 PY#showed significantly positive heterosis effects on all F1growth traits,except for Fulton’s condition coefficient(K)(P\0.05).In addition,significant positive linear correlations were found between the mean BW of corresponding progeny and the H E of the parental generation(y=600.7x-29.472,r=0.8651,P=0.0026),H O(y=1206.9x-518.14,r=0.7436,P=0.0216),and the polymorphism information content(y=1021.3x-331.31,r=0.8245,P=0.0063)as determined by a correlative test.The findings obtained from the study will be important for future considerations of M.amblycephala stock improvement programs.

关 键 词:杂种优势效应  特殊配合力  生长性状  双列杂交  团头鲂  平均体重  评价  线性相关关系

Heterosis and combining ability evaluation for growth traits of blunt snout bream (Megalobrama amblycephala) when crossbreeding three strains
Wei Luo,Cong Zeng,Shaokui Yi,Nicholas Robinson,Weimin Wang,Zexia Gao.Heterosis and combining ability evaluation for growth traits of blunt snout bream (Megalobrama amblycephala) when crossbreeding three strains[J].Chinese Science Bulletin,2014,59(9):857-864.
Authors:Wei Luo  Cong Zeng  Shaokui Yi  Nicholas Robinson  Weimin Wang  Zexia Gao
Abstract:Megalobrama amblycephala Combining ability Heterosis Growth performance
Keywords:Megalobrama amblycephala  Combining ability  Heterosis  Growth performance
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