长牡蛎二倍体与三倍体壳型性状对体质量的影响分析

Correlation and path analysis of quantitative traits of diploid and triploid Crassostrea gigas

为了研究长牡蛎(Crassostrea gigas)二倍体和三倍体壳体性状对体质量的影响,随机选取养殖20月龄的二倍体和三倍体个体各75个,分别测量它们的壳体性状(壳高、壳长和壳宽)和体质量(全湿重和软体重),并进行多元回归和通径分析。结果显示,二倍体和三倍体的软体重变异系数都最高,绝大多数性状间的相关性达到了显著水平(P<0.05),全湿重和软体重的相关性较高分别为0.866和0.675;多元回归分析结果显示,壳长、壳高和壳宽对二倍体长牡蛎全湿重的影响相当,其中壳高最大,直接作用系数为0.474,对软体重影响最大的是全湿重,直接作用系数高达0.780;壳宽对三倍体长牡蛎全湿重的影响最大,直接作用系数为0.471,壳高和湿重对软体重的直接作用系数分别为0.348和0.367;对长牡蛎二倍体和三倍体全湿重和软体重分别进行回归,结果显示其r2值均小于0.85,说明存在对质量性状影响较大的其他因素。本研究为不同倍性长牡蛎的比较研究提供了数据支持。

To study the effects of shell traits on weight traits of diploid and triploid Crassostrea gigas,75 diploid and triploid oysters aged 20 months were randomly sampled.Shell height,length,width,total wet weight,and soft body weight were analyzed using correlation analysis and path analysis.The results showed that soft body weight had the highest coefficient of variation(C.V.)in both diploid and triploid oysters.The correlation between total wet weight and soft body weight was significant(p<0.05)and high in both groups,with correlation coefficients of 0.866 and 0.675 for diploid and triploid oysters,respectively.Multiple regression analysis showed that shell height had the greatest effect on the total wet weight of diploids,with a direct effect coefficient of 0.474,and the greatest effect on the soft weight was the total wet weight,with a direct effect coefficient of 0.780.Shell width had the greatest effect on the total wet weight of the triploids,and the direct effect coefficients of shell height and wet weight on soft weight were 0.348 and 0.367,respectively.The regression equations of total wet weight and soft weight of diploids and triploids had R2 of less than 0.85 for both groups,indicating that there were other factors that had a great impact on weight traits.These findings provide a baseline for the comparative study of C.gigas with different ploidy.