海蜇幼蜇生长性状的遗传力估计及相关性分析

Heritability Estimating and Correlativity of Growth Traits in Juvenile Edible Jellyfish Rhopilema esculentum

遗传力是选择育种实践的基础和前提。为估计海蜇幼蜇生长性状的遗传力及生长性状间的相关关系,采用全同胞家系方法构建14个海蜇家系,进行为期300 d的生长试验,采集700个300日龄海蜇幼蜇的体质量和伞径2个生长性状的表型数据,通过双性状个体动物模型法估算海蜇幼蜇体质量和伞径2个生长性状的遗传力。试验结果表明,海蜇幼蜇在300日龄时的体质量和伞径2个生长性状的遗传力估计值分别为0.843±0.198、0.426±0.098,经t检验,2个遗传力均达到极显著水平(P<0.01),属于高度遗传力,说明对这2个性状进行选择育种具有较大的选育潜力。在300日龄时,体质量与伞径的遗传相关系数和表型相关系数分别为0.962±0.022和0.911±0.018,2个性状之间无论是遗传相关还是表型相关都呈高度正相关;利用回归模型建立的300日龄海蜇幼蜇伞径(x)对体质量(y)的数学模型为:y=0.1624 x 2.7291(r 2=0.8815)。研究结果可为深入研究海蜇的遗传育种提供理论基础和数据支持。

China is the only one country for farming of edible jellyfish Rhopilema esculentum.With the expansion and intensification of the jellyfish,various questions such as diseases,poor quality of larvae and less natural resources,have occurred and been serious,causing economic losses.At last,these questions are resolved by provided excellent breeds provided by using the selecting breeding program.It is an important way of selecting breeding.In this study,the phenotypic values of growth traits including body weight and umbrella diameter were measured in 700 individuals(300 days old)of edible jellyfish from 14 full-sib families to estimate the heritability and correlativity of growth traits.The results showed that the heritability of 300 days old individuals was 0.843±0.198 in body weight,and 0.426±0.098 in umbrella diameter,the heritability of these two traits being within higher heritability.In the 300 days old jellyfish,the genetic correlation and phenotypic correlation between body weight and umbrella diameter were 0.962±0.022 and 0.911±0.018 respectively,and both with highly positive genetic correlations.The regression analysis of phenotypic values of growth traits including body weight and umbrella diameter from 700 samples of 300 days old jellyfish revealed the mathematical model of growth traits\:y=0.1624 x 2.7291(r 2=0.8815).The findings provide guidance to the indirect selection and pre-selection in selective breeding of the jellyfish R.esculentum.