马氏珠母贝生长性状遗传力估计

为估计壳长、壳高和壳宽的广义遗传力,并进行家系综合评价,以马氏珠母贝第4代选育群体为亲本,构建了17个马氏珠母贝全同胞家系。16月龄时分别从每个家系随机取样30个个体,测定壳长、壳高和壳宽,利用主成分分析法比较不同家系的生长性状的差异。结果表明:17个家系平均壳长、壳高和壳宽范围分别为37.81~54.66 mm、38.86~54.81 mm和12.11~16.59 mm,家系间生长性状存在显著差异(P0.05),F11家系具有最大的平均壳长(54.66±4.98)mm和平均壳高(54.81±3.83)mm,F19家系具有最大平均壳宽(16.59±2.18)mm。壳长、壳高和壳宽的广义遗传力分别为56.32%、58.71%和42.89%,属于中度遗传力。根据综合评价指数,家系的表现为F11F19F20F1F30F32F13F3F27F10F14F23F29F25F31F26F28。结果说明马氏珠母贝第4代选育群体具有较大遗传方差,可持续通过选择技术改良群体。

Heritability Estimation for Growth Traits of Pinctada martensii

Abstract: To estimate the broad-sense heritability of shell length, shell height and shell width, seventeen full-sib families were established with artificial insemination technology by selecting the breeders from the fourth generation selected line of Pinctada martensii. Thirty individuals were randomly sampled from each family at age of 16 months. Shell length, shell height and shell width of each individual was measured. Broad-sense heritability values for growth traits were estimated based on measured data. Comprehensive evaluation was performed by principal component analysis. The results showed that average shell length, shell height and shell width of the seventeen families were 37.81-54.66 mm, 38.86-54.81 mm and 12.11-16.59 mm, respectively. There were significant differences on morphological characteristics among the seventeen families (P<0.05). Family 11 (F11) had the largest average shell length which was (54.66±4.98) mm and shell height which was (54.81±3.83) mm, while Family 19 displayed the largest average shell width which was (16.59±2.18) mm. The broad-sense heritability value estimated for shell length, shell height and shell width was 56.32%, 58.71% and 42.89%, respectively. Based on comprehensive evaluation, F11 had the highest value, followed by F19, F20, F1, F30, F32, F13, F3, F27, F10, F14, F23, F29, F25, F31, F26 and F28. The present results indicated that there was high genetic variation in the fourth generation selected line of Pinctada martensii.