斑节对虾3个种质群体体质量性状配合力及杂种优势分析

Analysis of combining ability and heterosis on body mass trait of three Penaeus monodon populations

该研究利用斑节对虾(Penaeus monodon)“南海1号”群体(S)、非洲品系选育群体(A)和泰国群体(T),采用完全双列杂交交配设计,建立9个自繁和杂交组合F1代。利用混合线性模型估计不同组合体质量性状的一般配合力(GCA)和特殊配合力(SCA)。结果显示,“南海1号”群体的一般配合力最高,其次是非洲品系选育群体,泰国群体的最低,其效应值分别为0.4373、−0.0624和−0.3749。9个交配组合的体质量性状的特殊配合力效应值介于−0.7798~0.613,其中非洲品系选育群体(♂)ד南海1号”群体(♀)组合(AS)体质量性状的特殊配合力最高,效应值为0.613。杂种优势分析表明,6个杂交交配组合的体质量性状中亲和超亲优势范围分别是8.41%~13.80%和2.66%~7.97%,其中非洲品系选育群体(♂)ד南海1号”群体(♀)组合(AS)的中亲杂种优势(HM)和超亲杂种优势(HB)最大,分别为13.80%和7.97%。研究表明,“南海1号”群体为母本,非洲品系选育群体为父本的杂交组合特殊配合力和杂种优势最好,可以考虑加强该组合在体质量性状方面的选育。

In this study,we bred nine inbred populations and hybridized F1 population for Penaeus monodon"Nanhai No.1"population(S),African breeding strain population(A)and Thailand population(T)by complete diallel cross,and then evaluated the general combining ability(GCA)and specific combining ability(SCA)in harvest body mass with mixed and generalized linear models.The GCA of"Nanhai No.1"was the highest,followed by the African breeding strain,and that of Thailand population was the lowest,with the effect values of 0.4373,−0.0624 and−0.3749,respectively.The effect values of SCA for six mating combinations was−0.7798−0.613,and the SCA of AS group was the highest(0.613).Heterosis analysis shows that the range of mid-parent heterosis and overhigh parent heterosis for six F1 populations were 8.41%−13.80%and 2.66%−7.97%,respectively.The results show that the SCA and heterosis of AS group were the best.Therefore,it is suggested to strengthen the selection and breeding in body mass for this group.