中间球海胆幼体及稚海胆生长性状的遗传参数估计

为估计中间球海胆Strongylocentrotus intermedius幼体及稚海胆生长性状的遗传参数,采用巢式不平衡设计方法建立了44个中间球海胆全同胞家系,并测量了各家系海胆四腕幼体、六腕幼体和八腕幼体等各期浮游幼体的体长以及受精后30 d的稚海胆壳径,采用动物模型和约束性最大似然法(REML)估计了中间球海胆幼体和稚海胆生长性状的遗传参数。结果表明:中间球海胆四腕幼体和八腕幼体体长的遗传力分别为0.705±0.373和0.538±0.444,为高度遗传力,六腕幼体体长和稚海胆壳径的遗传力均接近于0,为低度遗传力;各阶段幼体体长和稚海胆壳径的共同环境效应为0.048~0.352;各阶段幼体体长间遗传相关为正相关(0.300~0.518),各阶段幼体体长与稚海胆壳径间的遗传相关为负相关(-0.152~-0.435)。本研究结果可为制定中间球海胆的早期选择和间接选择选育方案提供参考依据。

Estimates of genetic parameters for growth traits in larval and juvenile sea urchin Strongylocentrotus intermedius

The body length of four-armed larva, six-armed larva, eight-armed larva and shell diameter of juvenile sea urchin Strongylocentrotus intermedius(30 days post fertilization) were measured in forty-four full-sib families by an unbalanced nest design and genetic parameters for growth traits were estimated using animal model technology and restricted maximum likelihood method ( REML). The results showed that heritability of body length was 0. 705±0. 373 in four-armed larvae and 0. 538±0. 444 in eight-armed larvae, higher than heritability (nearly ze-ro) in six-armed larvae and diameter in the juveniles. Common environmental effects at each larval stage and ju-venile stage were ranged from 0. 048 to 0. 352, and genetic correlations of body length of different stage larvae were positive and ranged from 0. 300 to 0. 518. While all genetic correlations of larval body length were negative at each stage and shell diameter of juveniles ranging from -0. 152 to -0. 435. The findings will provide guidance to the in-direct selection and pre-selection in selective breeding of sea urchin.