An analysis of the indirect genetic effect on the body weight of Fenneropenaeus chinensis under restrictive feeding conditions

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 限制投喂环境下中国对虾体重的间接遗传效应分析 DOI: 作者: 作者单位: 1. 上海海洋大学水产与生命学院, 上海 201306;2. 中国水产科学研究院黄海水产研究所, 农业农村部海洋渔业资源可持续利用重点开放实验室, 山东 青岛 266071;3. 青岛海洋科学与技术国家实验室海洋渔业科学与食物产出过程功能实验室, 山东 青岛 266071 作者简介: 仲伟鹏(1992-),男,硕士研究生,主要从事水产动物遗传育种研究.E-mail:pingtanxue@163.com 通讯作者: 中图分类号: S917 基金项目: 国家自然科学基金面上项目（31572616）；泰山学者种业人才团队项目；现代农业产业技术体系专项（CARS-48）. An analysis of the indirect genetic effect on the body weight of Fenneropenaeus chinensis under restrictive feeding conditions Author: Affiliation: 1. College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, China;2. Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture and Rural Affairs, Qingdao 266071, China;3. Qingdao National Laboratory of Marine Science and Technology, Functional Laboratory of Marine Fishery Science and Food Production Process, Qingdao 266071, China Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:为研究竞争性环境下中国对虾（）体重性状的间接遗传效应，设计多家系多分组方案，对来源于中国对虾G11代育种群体的103个测试家系限制配合饲料投喂量（正常投喂量50%），利用经典动物模型和包含间接遗传效应的扩展动物模型估算收获体重的遗传参数。基于2种模型估计出的经典遗传力分别为0.581±0.071和0.616±0.074。似然比率检验表明，体重的间接遗传效应显著，对总遗传方差的贡献度高达75.03%。由于存在一个较大的负直接遗传效应与间接遗传效应协方差（-2.1982），导致总遗传方差与表型方差的比值仅为0.524±0.212，小于经典的遗传力估计值。基于协方差获得的直接遗传效应与间接遗传效应的遗传相关系数为-0.495±0.184，暗示测试个体间存在较强的竞争交互。本研究表明，在饲料投喂量受限制的竞争性环境下，对虾个体间较强的竞争交互行为，对中国对虾收获体重间接产生了可遗传的效应，减少了可利用的总遗传变异。今后在设计中国对虾育种方案时，应避免在资源受限的强竞争环境下开展性状测试和遗传评估。 Abstract:An additive effect is the main genetic determinant of the phenotypic value of a quantitative trait, but it is a direct genetic effect (DGE) of the trait itself, ignoring the genetic influence of social interaction among individuals in the same group. The expression of genes of an individual has an influence on the phenotypic values of others in the same group, which is an indirect genetic effect (IGE). IGE is generated by social interaction among individuals in the group. IGE has been widely reported in animals and plants. For aquatic animals, IGE has been determined in Nile tilapia, Atlantic cod, and the Pacific white shrimp. The Chinese shrimp () is one of the most representative aquaculture species in China. In , cannibalism and frequent attacks are common phenomena. Attacks among individuals under environmental stress and the fight for food may affect the growth of shrimps. In order to study the indirect genetic effects of body weight in under restrictive feeding conditions, 103 families of the eleventh generation of the breeding population were tested using a multi-family by multi-group design. They were reared for about three months with limited feed and harvest body weight was measured for each individual. Genetic parameters of harvest body weight were estimated using an extended animal model, including IGE. The results showed that the IGE of body weight was significant, with a contribution to the total genetic variance reaching up to 75.03%. There was a negative covariance (-2.1900) between DGE and IGE. Based on the model with IGE, the ratio of total genetic variance to phenotypic variance was 0.524±0.212, which was less than the traditional estimate of heritability (0.616±0.074). In addition, there was a negative genetic correlation between the direct and indirect genetic effects (-0.495), implying that the existence of competitive effects may be detrimental to selective responses. This study demonstrated strong social interaction (competition among individuals) exists in a population of under restrictive feeding conditions, which had a heritable effect on body weight. Considering that the indirect genetic effect under the competitive environment has a greater negative impact on selection, it is inadvisable to conduct breeding programs under a competitive environment. 参考文献 相似文献 引证文献