摘要
利用遗传模型分析方法,对长牡蛎生长性状的遗传效应及其与环境互作效应进行研究。结果表明,壳长、壳宽和总重3个性状主要受显性效应控制,显性方差占表型方差的比例分别为0.31、0.23、0.36;壳高性状主要受显性-环境互作效应控制,显性-环境互作方差占表型方差的比例为0.37。4个性状中,壳高的加性效应作用较大,狭义遗传力达到0.10,表明以壳高为目标性状进行选育较容易。但由于总遗传力中互作广义遗传力大于广义遗传力,因此在选育过程中需考虑环境的影响。从遗传效应预测值看,中国和韩国群体杂交子代的效应值最大,表明这2个种群杂交易获得生长性状的杂种优势。
The genetic effect of growth-related traits was analyzed using genotype-environment interaction model. The traits including shell length, shell width and body weight were mainly controlled by dominant effect, and the ratio of dominant variance to phenotypic variance was 0.31, 0. 23 and 0. 36, respectively. Shell height was mainly controlled by dominance-environment interaction effect, and the ratio of domi- nance-environment interaction variance to phenotypic variance was 0. 37. Comparing to other three traits, shell height had the biggest additive effect and narrow-sense heritability （h~, 0.1）, suggesting that shell height was suitable as target trait during selective breeding. However, as the estimate of heritability for genotype-environment interactions was much higher than those broad-sense heritability, the effectiveness of selection may vary depending on various environmental conditions. In addition, the prediction of genetic merit in the cross combination of Chinese and Korean stock of C. gigas was the highest, suggesting that the crossbreeding progeny may have heterosis for growth-related traits.
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2013年第10期41-47,共7页
Periodical of Ocean University of China
基金
国家高技术研究发展计划项目(2012AA10A405)
国家重点基础研究发展计划项目(2010CB126406)资助
关键词
长牡蛎
生长性状
遗传效应与环境互作
Crassostrea gigas
growth-related trait
genotype-environment interaction
