凡纳滨对虾多个引进群体的杂交配合力分析

利用人工授精技术,通过双列杂交和巢式交配设计,以7个凡纳滨对虾群体生产家系130个,建立育种基础群体.利用混合线性模型和广义线性模型,结合约束极大似然法估计不同引进群体体质量和存活性状的一般配合力(general combining ability,GCA)和特殊配合力(special combining ability,SCA).结果显示,对于体质量性状,UA5、UA4和SIN 3个群体的GCA值最高,分别为0.42、0.32和0.19；17个杂交组合中,UA5×SIN、UA1×UA2、UA4×UA5、UA4×SIN和UA1×SIN 5个组合体质量和存活性状的SCA值正向优势较明显,是生产优良子代的优先搭配组合；体质量和存活性状配合力方差分析结果显示,不同环境下体质量性状GCA和SCA方差组分所占比例不同,但总体差异不大；相关性分析显示,不同环境下体质量性状配合力之间存在正相关,而存活性状存在负相关.

Combining ability of hybrid generation from the introduced populations of Litopenaeus vannamei

Seven populations of Litopenaeus vannamei were collected to evaluate the general combining ability and the specific combining ability in harvest body weight and survival with the mixed linear model and generalized linear models,combined with constrained maximum likelihood method.Incomplete diallel crosses and nest design were adopted and 130 full-sib families were obtained by artificial insemination.The results showed that the populations of UA5,UA4 and SIN were higher than others in general combining ability of harvest body weight,the magnitude were 0.40,0.32 and 0.19,respectively.The general combining ability of harvest body weight and survival in the hybrid groups of UA5×SIN,UA1×UA2,UA4×UA5,UA4×SIN and UA1×SIN,which were priority combinations in producing superior offspring,had positive advantages.The analysis of variance of combining ability showed that in different environments,the proportion of GCA and SCA variance component in body weight traits had little difference.Correlation analysis showed that there is positive correlation between the GCA of harvest weight,but negative correlation in survival.For the study of general combining ability and specific combining ability in different groups,the experiment provided the basic data for further genetic breeding of L.vannamei.