中国水产科学2018，Vol.25Issue(1)：26-33,8.DOI:10.3724/SP.J.1118.2018.17041
壳白长牡蛎品系生长和壳色性状遗传参数估计
Estimates of genetic parameters for growth and shell color traits in the white-shell strain of Pacific oyster(Crassostrea gigas)
摘要
Abstract
The Pacific oyster(Crassostrea gigas)is the most widely cultured shellfish in the world.There is con-siderable focus on improving selective breeding procedures for economic traits. We used specimens of the white-shell strain of C.gigas after four generations of family selection as parents to construct 30 full-sib families in a nested design. A mixed family approach combined with parentage analysis using highly polymorphic mi-crosatellite makers and REML based on the animal model was used to estimate genetic parameters of white-shell C. gigas at the age of 24 months.The results showed that heritabilities of shell height,shell length,total weight,shell weight, L*, a*, and b* were 0.35±0.13, 0.18±0.09, 0.20±0.09, 0.16±0.08, 0.16±0.08, 0.27±0.11, and 0.19±0.08, respectively. Shell width, meat weight, meat ratio, and indexes A and B of shell shape showed lower heritabilities of 0.07±0.02, 0.11±0.06, 0.02±0.03, 0.08±0.06, and 0.11±0.06, respectively. All phenotypic and genetic correla-tions among shell height, shell length, shell width, total weight, shell weight, and meat weight were positive. Ge-netic correlations were higher between shell height, shell length, total weight, and the other growth traits, ranging from 0.40±0.65 to 0.90±0.14, 0.39±0.55 to 0.97±0.24, and 0.50±0.66 to 0.99±0.02, respectively. Genetic correla-tion between index A of shell shape and shell height was –0.94±0.16, and –0.77±0.19 between index B of shell shape and shell height, suggesting that shell shape would not change if just shell height were selected in breeding programs. Genetic correlations were significantly different between shell color traits and growth traits, varying from –0.09±0.42 to 0.91±0.74. Higher genetic correlations between L* and growth traits indicated that direct se-lection on L* (the same as shell height, shell length, and total weight) could improve other growth traits. There was a negative genetic correlation between L* and a* of –0.96±0.04. Conversely, genetic correlations were lower between L* and a*, and between a* and b*, suggesting that selection to improve L* could also decrease a*. This information will benefit genetic improvement of the white-shell strain of C.gigas.关键词
长牡蛎/壳白品系/生长性状/壳色性状/遗传力/遗传参数估计Key words
Crassostrea gigas/white-shell/growth traits/shell color traits/heritability/genetic correlation分类
农业科技引用本文复制引用
邢德,李琪,张景晓..壳白长牡蛎品系生长和壳色性状遗传参数估计[J].中国水产科学,2018,25(1):26-33,8.基金项目
国家自然科学基金项目(31372524) （31372524）
泰山学者种业计划专家项目 （）
山东省科技发展计划项目(2016ZDJS06A06). （2016ZDJS06A06）
