不同月龄缢蛏新品种数量性状的相关与通径分析

Correlation and path analysis of quantitative traits of new variety of Sinonovacula constricta at different months of age

为了检测缢蛏新品种"申浙1号"不同月龄数量性状间的相关性。随机选取4、9、11月龄缢蛏个体60个以上,测量其壳长(SL)、壳高(SH)、壳宽(SW)、活体质量(W),采用相关与通径分析方法分析壳形态性状对活体质量的作用效果。结果显示,各数量性状之间的相关关系均达到极显著水平,其中与4、11月龄质量相关系数最大的是壳长,分别为0.911、0.631,与9月龄活体质量相关系数最大的是壳高,为0.653。通径分析结果显示,对4、9、11月龄活体质量的直接影响最大的分别是壳长(0.562)、壳宽(0.433)、壳高(0.394),决定系数与以上通径分析结果的变化趋势一致。利用逐步回归的方法分别建立4、9、11月龄缢蛏活体质量(W)的最优回归方程:W4=–0.756+0.039SL+0.112SW,R2=0.849;W9=–10.622+0.095SL+0.404SH+0.644SW,R2=0.631;W11=–23.772+0.207SL+0.805SH+0.587SW,R2=0.909。研究结果为缢蛏人工选育过程中的亲贝选择和产量预测等提供了基础数据。

In order to detect the correlation between quantitative characters for one new variety ＂Shenzhe No. 1＂ of Sinonovacula constricta at different months of age, more than 60 individuals of S. constricta at 4 th, 9 th and 11 th month age were randomly selected to measure the shell length（SL）, shell height（SH）, shell width（SW） and body weight（W）. And the correlation and path analysis method were used to analyze the effect of phenotypic character on qualitative traits. Then results showed that the correlations among the qualitative characters reached extremely significant levels. The shell length showed the greatest correlation coefficients to the live weight of the 4-month age and 11-month age（0.911 and 0.631） respectively. However, the shell height showed the greatest correlation coefficients to the weights of the 9-month age（0.653）. The result of the path coefficient analysis showed that the highest path coefficients were the shell length（0.562）, shell width（0.433）, and shell height（0.394） at 4 th, 9 th and11 th month age, respectively. The results of the determinant coefficients were consistent with the results of the path analysis. The multiple regression equations were obtained to estimate live weight of S.constricta as 4 th, 9 th and 11 th month age weights（W）： W4=–0.756＋0.039 SL＋0.112 SW, R^2=0.849; W9=–10.622＋0.095 SL＋0.404 SH＋0.644 SW,R^2=0.631; W11=–23.772＋0.207 SL＋0.805 SH＋0.587 SW, R^2=0.909. The study provides theoretical basis and good measures for the selection of the parents and aquaculture production forecast in the breeding of S. constricta.