摘要
应用数量遗传学原理和全同胞组内相关法估计了三疣梭子蟹80日龄和120日龄体重的遗传力。实验中的400只亲蟹均来自人工养殖的选育群体。通过群体间杂交,构建了37个全同胞家系包括13个半同胞家系,分别测定了80日龄和120日龄时大约30个个体的体重。利用SPSS软件的一般线性模型(GL.M)过程,计算表型变量的方差组分,估计体重性状的遗传力。结果表明,三疣梭子蟹80日龄和120日龄体重的遗传力估计值分别在0.42—0.64和0.25—0.39之间。雌性遗传方差组分均显著大于雄性遗传方差组分,说明雌性遗传方差组分存在显著的母性效应。经过t检验,父系半同胞、母系半同胞方差组分估计的遗传力均未达到显著水平,全同胞方差组分估计的遗传力达到极显著水平。因此可以认为基于全同胞方差组分估计的遗传力是对三疣梭子蟹两个发育阶段狭义遗传力的无偏估计值,估计值分别为0.53和0.35。说明三疣梭子蟹体重属于中度遗传力,对其选择育种具有较大的潜力。
With the rapid expansion and intensification of Portunus trituberculatus culture,various problems,such as diseases,larval degeneration,and natural resource depletion,have incurred economic losses,Therefore,study on selective breeding and heritability are important.In this paper,the heitability of P.trituberculatus in body weight was estimated by intra-group correlation of full-sibs.A total of 400 matured crabs were taken from culture populations.100 sires and 300 dams were mated in 1♂×3♀,and 13 half-sib families and 37 full-sib families were produced.About 30 individuals were randomly sampled in harvest on day 80 and 120 in age from each family and body weight measured.Causal components of phenotypic variance were calculated with the GLM procedure of SPSS software.Results show that the heritability on day 80 and 120 ranged 0.42—0.64 and 0.25—0.39,respectively.No significant difference was found in the heritability between maternal and paternal genetic variance.However,the difference was significant in components variance of full-sibs within sires and dams.The values 0.53 and 0.35 on day 80 and 120,respectively,from components of variance of full-sibs within sires and dams were precise and unbiased for the body weight.The study shows that the heritability in body weight of P.trituberculatus is moderate.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
2010年第3期322-326,共5页
Oceanologia Et Limnologia Sinica
基金
国家高技术研究发展计划(863计划)项目资助
2006AA10A406号
国家自然科学基金项目
30871933号
青岛市科技计划项目
07-2-3-5-jch号
关键词
三疣梭子蟹
体重
遗传力
Portunus trituberculatus
Body weight
Heritability
Full-sib
