Genotype by environment interaction for adult body weights of shrimp Penaeus vannamei when grown at low and high densities.
Genotype by environment interaction for adult body weights of shrimp Penaeus vannamei when grown at low and high densities.
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DOI：
10.1186/1297-9686-40-5-541
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发表时间：
2008-09
期刊：
影响因子：
--
通讯作者：
Famula R
中科院分区：
文献类型：
--
作者：
Ibarra AM;Famula R
虾是世界上为数不多的养殖海洋物种之一，目前正在进行几项选择性育种计划。一个环境因素，可以影响选择育种计划的反应是在虾养殖密度（低-中-高）。表型可塑性的生长反应，不同的密度可能伴随着一个显着的基因型与环境的相互作用，证明了环境之间的遗传力的变化和遗传相关性小于一个独特的性状环境之间。我们的目标是了解不同的生长密度是否影响这些遗传参数的估计成年体重（BW）在太平洋白色虾（南美白对虾）。BW遗传力在不同环境间差异显著，高密度下遗传力最大。这些差异是由于在高密度下生长时增加的加性遗传方差和减少的环境方差造成的。在两种环境条件下，体重之间的遗传相关性显着小于1。而这些结果可能是暗示进行虾的BW在高密度条件下的选择性育种，在给定的环境中的生长和繁殖性状之间的遗传相关性的进一步了解是必要的，因为有迹象表明，在高密度下生长的虾的生殖适合度降低。
Shrimp is one of few marine species cultured worldwide for which several selective breeding programs are being conducted. One environmental factor that can affect the response to selection in breeding programs is the density at which the shrimp are cultured (low-medium-high). Phenotypic plasticity in the growth response to different densities might be accompanied by a significant genotype by environment interaction, evidenced by a change in heritabilities between environments and by a genetic correlation less than one for a unique trait between environments. Our goal was to understand whether different growth densities affect estimates of those genetic parameters for adult body weight (BW) in the Pacific white shrimp (Penaeus vannamei). BW heritabilities were significantly different between environments, with the largest at high density. These differences resulted from both an increased additive genetic variance and a decreased environmental variance when grown at high density. The genetic correlation between BWs at the two environmental conditions was significantly less than one. Whereas these results might be suggestive for carrying out shrimp selective breeding for BW under high density conditions, further understanding of genetic correlations between growth and reproductive traits within a given environment is necessary, as there are indications of reduced reproductive fitness for shrimp grown at high densities.