| 摘要: |
| 采用多元回归和通径分析的方法, 研究了砂海螂(Mya arenaria)形态性状对重量性状的影响, 建立了利用形态性状估计重量性状的回归方程, 以评估砂海螂育种的选择指标。结果表明, 各形态性状与体重、软体部重之间的相关系数均达到极显著水平(P<0.01); 壳长对体重和软体部重的直接效应均为最大, 其通径系数分别为0.4338和0.3265, 是影响体重和软体部重的主要因素。壳宽对体重和软体部重的直接影响效应次之, 但壳高对重量性状的影响主要是间接效应。决定系数分析的结果与通径分析结果具有一致的变化趋势。上述结果为砂海螂选择育种提供了依据, 以壳长作为首选指标, 能有效地增加体重和软体部重。 |
| 关键词: 砂海螂 数量性状 选择指标 通径分析 |
| DOI：10.11693/hyhz201303034034 |
| 分类号: |
| 基金项目:山东省农业良种工程项目“优质高产抗逆贝类良种选育”, 2009—2013; 鲁东大学学科建设基金资助项目, 2009—2012 |
附件 |
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| ESTIMATION OF SELECTION INDEX OF SOFT-SHELL CLAM (MYA ARENARIA) BASED ON QUANTITATIVE TRAITS |
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SUN Zhen-Xing1, LIU Xiang-Quan2, CHANG Lin-Rui1
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1.College of Life Science, Ludong University;2.Shandong Marine Fisheries Research Institute
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| Abstract: |
| To estimate the selection index of soft-shell clam (Mya arenaria) breeding, effect of morphological trait on weight trait of M. arenaria was studied by methods of multivariate regression and path analysis. M. arenaria of four-year-old 110 individuals were randomly sampled, from which five quantitative traits were measured including shell length, shell width, shell height, body weight, and soft-tissue weight. The regression equations were also established to estimate weight traits with morphological traits. The results show that all the correlation coefficients between each morphological trait and body weight or soft-tissue weight are at extremely significant level (P<0.01). Shell length has the greatest direct effect on the body weight and soft-tissue weight, the path coefficients were 0.4338 and 0.3265, respectively. Shell length is the key influencing factor of body weight and soft-tissue weight. Shell width has the second greatest direct effect on body weight and soft-tissue weight, but the effect of shell height on weight traits is mainly indirect. The analysis results of determination coefficients for the morphological traits against weight traits agreed well with the results of path analysis. |
| Key words: Mya arenaria quantitative traits selection index path analysis |
