| 摘要: |
| 选择来自75个家系的6000尾凡纳滨对虾个体进行为期96h的耐低溶氧试验，测定其生长性状和耐低溶氧性状。利用线性动物模型估计了凡纳滨对虾收获时期生长和耐低溶氧性状的方差组分和遗传参数。结果显示，凡纳滨对虾收获体长和收获体质量的遗传力分别为0.35±0.11和0.48±0.15，表现为中高遗传力水平，且统计检验显著（P<0.05）。收获体长和收获体质量间的表型相关和遗传相关分别为0.89和0.95，表现为高度线性正相关（P<0.05）。凡纳滨对虾耐低溶氧性状的遗传力为0.07±0.03，表现为低遗传力水平。生长性状（收获体长和收获体质量）和耐低溶氧性状间的表型相关和遗传相关分别为0.14—0.18和0.11—0.13，表现为低度线性正相关，但统计检验不显著（P>0.05）。耐低溶氧性状的选择反应和遗传获得的估计值较低，分别为0.02±0.02和4.87%。体长的选择反应和遗传获得分别为0.65±0.18和7.22%；体质量的选择反应和遗传获得分别为1.13±0.31和11.07%，表明第一代对生长性状的选育达到了良好的效果。 |
| 关键词: 凡纳滨对虾 生长性状 耐低溶氧性状 遗传参数 遗传获得 |
| DOI：10.11693/hyhz20160400084 |
| 分类号: |
| 基金项目:广东省海洋渔业科技推广专项科技攻关与研发项目，A201208B05号；“十二五”国家科技支撑计划课题，2015BAD13B03号。 |
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| ESTIMATION ON GENETIC PARAMETERS AND GENETIC GAIN IN GROWTH AND HYPOXIC TOLERANCE TRAITS OF LITOPENAEUS VANNMEI |
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ZHANG Jia-Chen, CAO Fu-Jun, LIU Jian-Yong, YUAN Rui-Peng
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Fisheries College, Guangdong Ocean University, Zhanjiang 524025, China
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| Abstract: |
| We conducted a 96-h experiment on 6000 individuals from 75 families of Litopenaeus vannmei to estimate the genetic parameters in growth and hypoxic tolerance traits of the shrimp to hypoxic tolerance challenge. Variance components and genetic parameters of growth and hypoxic tolerance traits of L. vannmei were estimated using animal models. The results show that the heritability estimates on body length and body weight at harvest were high (0.35±0.11 and 0.48±0.15) (P<0.05). The phenotypic and genetic correlation between body weight and body length at harvest were high (0.89 and 0.95) (P<0.05), too. However, the heritability estimates on hypoxic tolerance traits were low (0.07±0.03), and the phenotypic and genetic correlations between growth traits and hypoxic tolerance traits were low (0.14—0.18 and 0.11—0.13) (P>0.05), respectively. The response to selection and genetic gain for hypoxic tolerance traits were low (0.02±0.02 and 4.87%, respectively). The response to selection and genetic gain in body length were 0.65±0.18 and 7.22%, and in body weight 1.13±0.31 and 11.07%, respectively, which suggest that a high effectiveness of selection for growth traits in L. vannmei. |
| Key words: Litopenaeus vannamei growth traits hypoxic tolerance traits genetic parameters genetic gain |
