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施氏獭蛤早期生长性状遗传参数和育种值估计
邹杰1, 张守都2, 彭慧婧1, 郑德斌3
1.广西壮族自治区海洋研究所;2.青岛国家海洋科学研究中心;3.天津渤海水产研究所
摘要:
以2代选育群体为亲本,采用巢式设计构建21个施氏獭蛤全同胞家系,利用混合线性模型对30日龄和80日龄施氏獭蛤生长性状进行遗传参数和育种值估计。结果显示,施氏獭蛤早期发育过程中壳长生长速度较壳高快,性状间遗传相关系数范围为0.96~0.98,表型相关系数范围为0.77~0.96,均呈正相关,80日龄施氏獭蛤壳长、壳高与体质量间表型相关系数较高;30日龄的壳长和壳高性状遗传力分别为0.31±0.02和0.25±0.01,80日龄的壳长、壳高、壳宽和体质量性状的遗传力分别为0.35±0.27,0.27±0.20,0.06±0.04和0.25±0.19,壳宽性状遗传力为低遗传力,其余性状遗传力均属中等遗传力;不同性状个体育种值的前10家系相同率为70%~90%,基于育种值选择比基于表型值选择效率提高13%~30%(10%留种率)。研究表明,施氏獭蛤早期对体质量性状进行选择时可参考壳长、壳高性状,早期利用壳长、壳高和体质量性状进行选择时遗传进度高,利用个体育种值进行选择具有更高的优势。研究结果将为施氏獭蛤生长性状选择育种提供了参考依据。
关键词:  施氏獭蛤  全同胞家系  生长性状  遗传参数  育种值
DOI:
分类号:S968.3
基金项目:广西创新驱动重大专项(桂科AA19254008);广西重点研发项目(桂科AB16380104)。
Estimation of genetic parameters and breeding values of early growth traits ofLutraria sieboldii
Zou Jie1, Zhang Shou-du2, Peng Hui-jing1, Zheng De-bin3
1.Guangxi Institute of Oceanology;2.National Oceanographic Center,Qingdao;3.Tianjin Bohai Sea Fisheries Research Institute
Abstract:
In this study, 21 Lutraria sieboldii full-sib families were established in a balanced nested design which parents come from a 2th generation selective population. Genetic parameters and breeding values of growth traits of 30th day and 80th day were estimated by a mixed linear model. The results showed that shell width had a faster growth than shell length at the early growth stage, while growth traits correlation coefficient ranged from 0.96~0.98 and phenotypic correlation coefficient ranged from 0.77 to 0.96. There were higher performances of correlation coefficient between shell length or shell width and body mass on 80th growth relatively. In our outcomes, shell width had a low heritability, while other growth traits had medium heritabilities. Heritabilities of shell length and shell width of 30th day were 0.31±0.02, 0.25±0.01, respectively, while heritabilities of shell length, shell height, shell width and body mass of 80th day were 0.35±0.27, 0.27±0.20, 0.06±0.04 and 0.25±0.19, respectively. The selective efficiency based on breeding value was higher than that of based on phenotype by a 13%~30% advantage. The growth performance of the top 10 families according to growth traits breeding values had a 70%~90% similarity. Above all the outcomes indicated that there were high genetic gains at early growth stage by shell length, shell width and body mass selection, while a higher genetic gain was achieved by selection according to breeding value. This study suggests a reasonable potential for the improvement of growth of Lutraria sieboldii for further selective breeding.
Key words:  Lutraria sieboldii  full-sib family  growth traits  genetic parameters  breeding value
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