皱纹盘鲍表型性状与肌肉重的相关与通径分析

Correlation and path analysis of phenotypic traits and muscle weight of Pacific abalone Haliotis discus hannai Ino

选取日本岩手县×中国大连獐子岛的一个杂交家系,随机测定132尾三年龄皱纹盘鲍(Haliotis discus hannai Ino)的壳长(x1)、壳宽(x2)、总重(x3)、壳重(x4)、软体部重(x5)及肌肉重(y)6个指标,计算各性状间的相关系数,采用通径分析方法计算以表型性状为自变量,肌肉重为依变量的通径系数、决定系数,对各性状的影响大小进行剖分,明确影响皱纹盘鲍肌肉重的主要表型性状,为皱纹盘鲍选育提供理论依据和理想的测度指标。结果表明:所测各表型性状与肌肉重之间的相关系数均达到极显著水平(P<0.01);软体部重对肌肉重的直接影响最大(为0.512),其次为总重,对肌肉重的直接影响为0.484,二者差异不显著(P>0.05),其他性状对肌肉重的直接影响均不大。剔除通径系数检验不显著的自变量,利用逐步回归的方法,建立以肌肉重为依变量的最优多元线性回归方程为:y=-0.381+0.239x3+0.342x5,其调整决定系数为0.989,表明所选性状是影响肌肉重的主要性状。

In order to study the correlation between phenotypic traits and muscle weight of Pacific abalone Haliotis discus hannai Ino, 132 three-years-old individuals were sampled from a family constructed by crossing two Pacific abalones J255 and C26, which came from different geographic areas （Japan and China, respectively）. Totally six metric traits were measured, including shell length （xl）, shell width （x2）, total weight （x3）, shell weight （x4）, weight of soft part （xs）, and muscle weigh （y）. The data were submitted to correlation and path analysis. The results showed that the Pearson correlations between every two metric traits ranged from 0.958 to 0.995, and all reached significance levels （P 〈 0.01）. The trait with the strongest direct effect on muscle weigh was the weight of soft part （0.512）, and to a less extent the total weight （0.484）. Whereas, the difference of direct effect between the total weight and the weight of soft part was not significant （P 〉 0.05）. Other traits, such as shell length, shell width, and shell weight were not significantly correlated with muscle weight （P 〉 0.05）. The multiple regression equation （y = -0.381 ＋ 0.239x3 ＋ 0.342x5 ） was established using the stepwise regression method with Xl, x2and x4 being excluded; the R2 of this equation was 0.989, suggesting that the selected attributes are relevant.