摘要
采用完全双列杂交配组方法和加性显性遗传分析模型,在水泥池和网箱2种不同放养环境中,计算了罗非鱼生长相关性状杂种优势。结果表明:(1)杂交F1代相对于F2代在各生长性状上均表现出更强的杂种优势。各性状的优势程度也有所不同,F1代群体平均优势在15.1%-30.6%之间,F2代则有所降低,在7.6%-15.3%之间。结果说明,罗非鱼各生长性状在F1代均表现出超中亲优势,但在F2代则表现出负向群体超亲优势。(2)各生长性状的基因型效应与杂种优势都存在明显的环境差异,表现为在网箱内高密度的养殖环境中存在较强的杂种优势,而在水泥池环境中杂种优势效应则相对较弱,表明在对罗非鱼的杂种优势利用中应当充分考虑环境因素的影响。
A complete diallel mating system with Oreochromis niloticus, O. aureus, and their hybrids, and additive-dominant genetic model were used to analyse heterosis in different fish density environments of concrete pond and small cage. The results indicated that (1) Heterosis of growth related traits in F1 hybrid was higher than in F2, and varied in different trait from 15.1% to 30. 6% in F1 , but decreased in F2 with the range of 7.6% to 15.3%. Mean heterosis of these growth related traits were all positive in F1, but negative in F2. (2) The genotype effects and heterosis of all these traits had interaction with environment. In cages with high density of fish, the heterosis of these traits were much higher, and in concrete ponds with low fish density they were much lower, suggesting that environment effects should be considered in utilizing heterosis of tilapia.
出处
《南方水产》
2007年第3期1-7,共7页
South China Fisheries Science
基金
中国水产科学研究院水产种质资源与养殖技术重点开放实验室开放课题(2004A002)
关键词
罗非鱼
杂种优势
环境
tilapia
heterosis
environment