Estimates of heritabilities and genetic correlations for growth and gonad traits in the sea urchin Strongylocentrotus intermedius
Estimates of heritabilities and genetic correlations for growth and gonad traits in the sea urchin Strongylocentrotus intermedius
复制标题
海胆 Strongylocentrotus intermedius 生长和性腺性状的遗传力和遗传相关性估计
DOI：
10.1111/j.1365-2109.2011.02825.x
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发表时间：
2012-01-01
影响因子：
2
通讯作者：
Song, Jian
中科院分区：
文献类型：
--
作者：
Chang, Yaqing;Zhang, Weijie;Song, Jian
本研究是第一次估计的海胆，中间球海胆，在整个生殖期的生长和性腺性状的遗传参数。从74 ~ 120个家庭中采集了6个不同生长阶段的21655764只海胆。在收获时，从20个随机选择的家庭中抽取600个个体。多数生长性状和性腺性状的变异系数较高（18.08-78.66%），具有良好的育种变异基础。基于公畜方差分量的遗传力的点估计值在试验高（0.24-0.39）、试验直径（0.21-0.48）和体重（0.16-0.49）上为中等偏高。生殖腺湿重、生殖腺指数和生殖腺含水量的遗传力分别为0.17、0.41和0.50（中等或较高）。性腺颜色参数L*（亮度）和a*（红色）的遗传力为0，而B*（黄色）和色差Δ E1和Δ E2的遗传力非常相似，分别为0.2、0.18和0.21。β-胡萝卜素浓度和含量的遗传力分别为0.89和0.44。两个性状间的遗传相关系数为-0.984 ~0.999。性腺湿重、L*、B*、β-胡萝卜素浓度和β-胡萝卜素含量与各生长性状均呈显著的正遗传相关。而性腺指数、性腺含水量和性腺颜色差异Δ E1和Δ E2与生长性状呈显著的负遗传相关。本研究表明，选择中、高潜力的品种，可提高生长、性腺产量和多数性腺品质性状。生殖腺性状应以生长性状为次要性状进行间接选择。本研究为今后的选育提供了重要的理论指导。中间体
The present study is the first estimate for the sea urchin, Strongylocentrotus intermedius, of genetic parameters for growth and gonad traits during the entire reproductive period. 21655764 sea urchins were sampled from 74 to 120 families at six different growth stages. Six hundred individuals were sampled from 20 randomly chosen families at harvest. Coefficients of variation for most growth and gonad traits were high (18.08-78.66%) suggesting a good variation foundation for breeding. Point estimate for heritabilities based on the sire components of variance were moderate to high for test height (0.24-0.39), test diameter (0.21-0.48) and body weight (0.16-0.49). Heritabilities of gonad wet weight, gonad index and gonad moisture at harvest were 0.17, 0.41 and 0.50 respectively (moderate or high). Gonad colour parameters, L* (lightness) and a* (redness) have a heritability of 0, while b* (yellowness) and colour difference Delta E1 and Delta E2 have very similar heritabilities of 0.2, 0.18 and 0.21 respectively. Heritabilities of beta-carotene concentration and content were 0.89 and 0.44 respectively. The genetic correlations between the two measured traits ranged from -0.984 to 0.999. Gonad wet weight, L*, b*, beta-carotene concentration and beta-carotene content had significant positive genetic correlations with all the growth traits. However, gonad index, gonad moisture and colour differences Delta E1 and Delta E2 had significant negative genetic correlations with growth traits. The present study indicates that growth, gonad yield and most gonad quality traits could be improved by selection with moderate to high potential. Indirect selection should be applied on gonad traits using growth traits as secondary traits. The present study provides important theoretical guidance for future selective breeding programmes for S. intermedius.