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Dai Ping,Wang Hongxia,Xiao Guoqiang,Liu Baozhong. 2014. Combining ability and heterosis analysis over two environments in a diallel cross of three families of the clam Meretrix meretrix. Acta Oceanologica Sinica, 33(10):37-42
Combining ability and heterosis analysis over two environments in a diallel cross of three families of the clam Meretrix meretrix
三个文蛤家系双列杂交设计在两种环境下的配合力及杂种优势分析
Received:May 23, 2013  Revised:January 07, 2014
DOI:10.1007/s13131-014-0539-x
Key words:Meretrix meretrix  general and specific combining ability  reciprocal effects  heterosis  diallel cross
中文关键词:  文蛤  配合力  反交效应  杂种优势  双列杂交
基金项目:The National High-Tech R & D Program of China (863 Program) under contract No. 2012AA10A410; the Key Technologies R & D Program of Jiangsu Province under contract No. BE2011372.
Author NameAffiliationE-mail
Dai Ping Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
University of Chinese Academy of Sciences, Beijing 100039, China 
 
Wang Hongxia Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China  
Xiao Guoqiang University of Chinese Academy of Sciences, Beijing 100039, China  
Liu Baozhong Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China bzliu@qdio.ac.cn 
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Abstract:
      A 3×3 complete diallel cross comprising three families of the clam Meretrix meretrix (P1, P2 and P3) was used to determine the combining ability of parental families and heterosis of F1 under indoor and openair environments for growth traits. Analysis of variance for shell length and whole body weight indicated highly significant cross effects, environment effects and the interaction of cross by environment. General combining ability (GCA) and specific combing ability exhibited great variation among crosses and between two environments. Pooled over environments, P2 was the top combiner among the three parental families for both traits studied. The cross of P1 and P3 had the highest SCA. Additionally, significant reciprocal effects were observed. For individual environment, about half of the crossbred combinations showed favorable Mid-parent heterosis (MPH) (>1%) for the shell length and whole body weight. Our data has shown that non-additive genetic and reciprocal effects constituted the major sources of genetic variation for both shell length and whole body weight, which indicates that crossbreeding among selective families could further explore the heterotic effects.
中文摘要:
      利用三个文蛤家系(P1、P2和P3)3×3完全双列杂交子代,研究室内与室外养殖环境下生长性状的配合力以及杂交优势。壳长和体重的方差分析结果表明存在极显著的组合效应、环境效应以及组合环境互作效应。不同组合间和环境间的一般配合力(GCA)和特殊配合力(SCA)差异显著。综合两个环境来看,在3个家系中,家系P2的两个性状的一般配合力最高,家系P1和P3组合的特殊配合力最高,另外,存在显著的反交效应。在单个环境下,约半数的杂交组合在壳长和体重上表现出有利的中亲杂种优势(MPH > 1%)。数据显示,非加性遗传效应和反交效应构成了壳长和体重的遗传变异的主要来源,这表明有选择的家系间的杂交可以进一步发掘杂种优势。
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