文章摘要
鳙30日龄生长性状的遗传参数分析
Genetic parameter analyses of growth traits at 30dph in bighead carp (Hypophthalmichthy nobilis)
投稿时间:2019-09-24  修订日期:2019-12-23
DOI:
中文关键词:   生长性状  杂种优势  配合力  遗传力
英文关键词: Hypophthalmichthy nobilis  growth trait  heterosis  combining ability  heritability
基金项目:江苏省基础研究计划—青年基金项目(BK20160205);国家现代农业产业技术体系建设专项(CARS-45-05)
作者单位E-mail
朱文彬 上海海洋大学水产与生命学院
中国水产科学研究院淡水渔业研究中心 
zhuwenbin@ffrc.cn 
傅建军 中国水产科学研究院淡水渔业研究中心  
方敏 中国水产科学研究院淡水渔业研究中心  
王兰梅 中国水产科学研究院淡水渔业研究中心  
张利德 苏州市未来水产养殖场  
刘其根 上海海洋大学水产与生命学院  
董在杰 中国水产科学研究院淡水渔业研究中心 dongzj@ffrc.cn;dongzaijie@ffrc.cn 
摘要点击次数: 75
全文下载次数: 0
中文摘要:
      为了研究鳙早期生长性状的遗传改良潜力,利用2个亲本群体进行群体繁殖(组1)和人工授精(组2)实验,并分别采集672尾30日龄鱼苗,用于开展对早期生长性状的遗传分析。通过微卫星标记分别鉴定了其中628和660尾个体的亲本来源,并依此获取群体双列杂交的信息;亲本对应子代贡献率存在极显著差异(P<0.01)。在2个繁殖组中,体质量和体长在家系间均存在极显著差异(P<0.01);在组2中,体质量和体长在交配设计间均存在显著差异(P<0.05)。此外,杂交组合的2个生长性状均呈现出中亲杂种优势(0.39-7.64%),其特殊配合力也均为正值(0.01-0.02)。基于动物模型和限制性最大似然法,鳙30日龄体质量和体长的遗传力估值分别为0.47和0.49,且均达到极显著水平(P<0.01)。体质量和体长间存在极显著的遗传相关和表型相关(P<0.01),分别为0.89和0.83。研究表明,通过家系构建和群体杂交,可以获得具有生长优势的鳙鱼苗;鳙30日龄生长性状具有较高选育潜力,而亲本对子代贡献的不平衡现象在选育过程中需要引起重视。
英文摘要:
      The aim of this study was to estimate the genetic improvement potential of early growth traits in bighead carp (Hypophthalmichthy nobilis). The practices of mass spawning (group 1) and artificial insemination (group 2) were carried out using two populations of H. nobilis, and 672 fries at 30dph (days post-hatching) were collected from each group, that were used for the further analyses of early growth traits. Base on microsatellite markers, total of 628 and 660 individuals from group 1 and group 2, respectively, were assigned with unambiguous pedigrees and reconstructed with population diallel cross combinations. Extremely significant unequal parental contributions were detected in both groups (P<0.01). The extremely significant differences in BW (body weight) and SL (standard length) were detected among families in both groups (P<0.01), and the significant differences in BW and SL were detected among diallel cross combinations in group 2 (P<0.05). Furthermore, the positive values in mid-parent heterosis (0.39–7.64%) and special combining ability (SCA) (0.01–0.02) of two growth traits were detected in the hybridized combinations. Based on the animal model and restricted maximum likelihood (REML) algorithm, the heritability estimates of BW and SL in H. nobilis (30dph) were calculated as 0.47 and 0.49, respectively (P<0.01). The extremely significant genetic and phenotypic correlations were found between BW and SL, with 0.89 and 0.83, respectively (P<0.01). The results indicated that the early growth traits of H. nobilis could be improved through family construction, cross breeding and selective breeding, but the unequal parental contribution should be taken into account in practical breeding programs.
HTML     下载PDF阅读器
关闭

手机扫一扫看