文章摘要
深凹壳型香港牡蛎选育群体生长性状的遗传参数估计
Estimates of genetic parameters for growth-related traits in mass selection of the deep cupped shell shape of Crassostrea hongkongensis
投稿时间:2018-11-19  修订日期:2019-03-26
DOI:
中文关键词: 香港牡蛎  深凹壳型  壳型指数D  群体选育  遗传参数
英文关键词: Crassostrea hongkongensis  deep cupped shell shape  index of shell depth  mass selection  genetic parameters
基金项目:广东省科技厅项目(2016B020233005);国家贝类产业体系建设专项(CARS-49)
作者单位E-mail
莫日馆 中国科学院南海海洋研究所 moriguanouc@163.com 
肖述 中国科学院南海海洋研究所  
秦艳平 中国科学院南海海洋研究所  
张跃环 中国科学院南海海洋研究所  
马海涛 中国科学院南海海洋研究所  
喻子牛 中国科学院南海海洋研究所 carlzyu@scsio.ac.cn 
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中文摘要:
      为了培育壳型和生长性状优良的深凹壳型香港牡蛎新品系,以广东台山镇海湾野生香港牡蛎天然采苗的2龄养殖群体为基础群体,以壳型指数D为指标,按照10%留种率和1.755选择强度,利用截头法进行深凹壳型香港牡蛎的群体选育;分析了幼虫期、中间培养期、养成后期的选择反应、遗传获得和现实遗传力等遗传参数。结果表明,选择组的壳高和壳型指数D均大于对照组,遗传参数估算值随着个体的增大而增加。幼虫期,壳高的平均选择反应、平均遗传获得、平均现实遗传力分别为0.363±0.167、(1.678±0.416)%、0.207±0.095,中间培养期分别0.639±0.115、(7.618±2.666)%、0.364±0.065,养成后期分别为0.668±0.179、(8.861±3.072)%、0.381±0.102。养成后期,壳型指数D平均选择反应、平均遗传获得、平均现实遗传力分别为0.748±0.066、(9.090±0.565)%、0.426±0.038。研究结果为培育深凹壳型、生长性能良好的香港牡蛎优良品种提供了实验依据和理论基础。
英文摘要:
      In order to create a new strain with deep cupped shell shape of Crassostrea hongkongensis and better growth traits, a breeding program of truncation selection was initiated based on the 2-year-old culture population of wild Crassostrea hongkongensis collected naturally from Taishan Town Bay, Guangdong Province. The index of shell depth was used as an indicator, with 10% retention rate and 1.755 selection strength. The genetic parameters including selection reaction, genetic gain and realized heritability in larval stage, intermediate cultivation stage and later grow-out stage were estimated. The results showed that the shell height and index of shell depth in selected group were higher than that in control group, and the genetic parameters increased with the growth of individuals, showing a favorable genetic improvement potential. The average selective reaction, genetic gain and realized heritability of shell height at larval stage is 0.363±0.167, (1.678±0.416)% and 0.207±0.095, respectively; at intermediate cultivation stage is 0.639±0.115, (7.618±2.666)%, and 0.364±0.065, respectively; and later grow-out stage is 0.668±0.179, (8.861±3.072)% and 0.381±0.102, respectively. At the later grow-out stage, the average selective reaction, genetic gain and realized heritability of index of shell depth is 0.748±0.066, (9.090±0.565)%, and 0.426±0.038, respectively. The research provided a useful data for the creation of a new strain with deep cupped shell shape and good growth traits in Crassostrea hongkongensis .
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