| LIANG Bingbing,YUE Xin,WANG Hongxia,LIU Baozhong.Influence of parental sample sizes on the estimating genetic parameters in cultured clam Meretrix meretrix based on factorial mating designs[J].Acta Oceanologica Sinica,2016,35(6):42-49 |
| 因子交配设计中文蛤亲本数目对遗传参数估计的影响 |
| Influence of parental sample sizes on the estimating genetic parameters in cultured clam Meretrix meretrix based on factorial mating designs |
| 投稿时间：2015-03-31 修订日期：2015-09-14 |
| DOI：10.1007/s13131-016-0875-0 |
| 中文关键词: 文蛤 亲本数目 遗传参数 因子设计 限制性最大似然估计法 贝叶斯推论 |
| 英文关键词:Meretrix meretrix parental sample sizes genetic parameter factorial design restricted maximum likelihood Bayesian inference |
| 基金项目: |
| 作者 | 单位 | E-mail | | 梁冰冰 | 实验海洋生物学重点实验室, 中国科学院海洋研究所, 青岛 266071
中国科学院大学, 北京 100049 | | | 岳欣 | 实验海洋生物学重点实验室, 中国科学院海洋研究所, 青岛 266071
青岛海洋科学与技术国家实验室, 青岛 266200 | | | 王鸿霞 | 实验海洋生物学重点实验室, 中国科学院海洋研究所, 青岛 266071
青岛海洋科学与技术国家实验室, 青岛 266200 | hxwang@qdio.ac.cn | | 刘保忠 | 实验海洋生物学重点实验室, 中国科学院海洋研究所, 青岛 266071
青岛海洋科学与技术国家实验室, 青岛 266200 | |
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| 中文摘要: |
| 在人工育种中,遗传参数的精确估计是制定有效选育策略的前提和基础。贝类重要经济性状遗传力的估计已有诸多文献报道,然而不同家系结构对遗传参数估计准确性影响的研究却鲜有报道。因此,本研究采用REML算法和Bayesian推论对文蛤不同规模因子设计的家系进行生长性状遗传参数的估计,探究不同亲本数对参数估计准确性的影响。结果显示,当时用REML算法对四个性状进行遗传力估计时,9个和16个全同胞家系文蛤生长性状的遗传力在0.23-0.32之间,25个全同胞家系生长性状的遗传力在0.19-0.22之间。当使用Bayesian推论时,9个和16个全同胞家系文蛤生长性状的遗传力在0.11-0.12之间,25个全同胞家系生长性状的遗传力在0.13-0.16之间。与REML算法相比,根据Bayesian推论得到的遗传力值略低,但是仍处于中等遗传力的水平。当亲本数目由6增加到10时,采用REML算法得出的遗传力估计值接近于0.20,而采用Bayesian算法得出的估计值接近于0.12。生长性状之间的遗传相关呈现显著的正相关,且不同规模的因子设计之间并无显著差异。当全同胞家系数目由9个增加到25个时,育种值的准确性呈现增加趋势。本文研究结果可为文蛤的人工选育工作提供可靠的理论指导。 |
| 英文摘要: |
| The precise and accurate knowledge of genetic parameters is a prerequisite for making efficient selection strategies in breeding programs. A number of estimators of heritability about important economic traits in many marine mollusks are available in the literature, however very few research have evaluated about the accuracy of genetic parameters estimated with different family structures. Thus, in the present study, the effect of parent sample size for estimating the precision of genetic parameters of four growth traits in clam M. meretrix by factorial designs were analyzed through restricted maximum likelihood (REML) and Bayesian. The results showed that the average estimated heritabilities of growth traits obtained from REML were 0.23-0.32 for 9 and 16 full-sib families and 0.19-0.22 for 25 full-sib families. When using Bayesian inference, the average estimated heritabilities were 0.11-0.12 for 9 and 16 full-sib families and 0.13-0.16 for 25 full-sib families. Compared with REML, Bayesian got lower heritabilities, but still remained at a medium level. When the number of parents increased from 6 to 10, the estimated heritabilities were more closed to 0.20 in REML and 0.12 in Bayesian inference. Genetic correlations among traits were positive and high and had no significant difference between different sizes of designs. The accuracies of estimated breeding values from the 9 and 16 families were less precise than those from 25 families. Our results provide a basic genetic evaluation for growth traits and should be useful for the design and operation of a practical selective breeding program in the clam M. meretrix. |
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