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低温胁迫条件下中国明对虾生长性状和耐低温性状的遗传参数评估
王明珠1,2, 孟宪红1,3, 孔 杰1,3, 曹家旺1,3, 王 军1,2, 冯亚萍1,2, 强光峰1,2
1.农业部海洋渔业可持续发展重点实验室 中国水产科学研究院黄海水产研究所 青岛 266071;2.上海海洋大学水产与生命学院 上海 201306;3.青岛海洋科学与技术国家实验室海洋渔业科学与食物产出过程功能实验室 青岛 266071
摘要:
本研究采用室内人工降温的方式,对69个中国明对虾(Fenneropenaeus chinensis)家系共1327尾成虾进行了耐低温实验,测定其生长和耐低温性状;并利用混合模型方程,通过平均信息约束极大似然法进行遗传力和遗传相关估计。采用2种动物模型对中国明对虾成虾低温下体重、体长的遗传力进行评估,模型1加入了共同环境效应,模型2没有加入共同环境效应。由模型1获得的体重、体长的遗传力分别为(0.206±0.177)、(0.187±0.179),由模型2获得的体重、体长的遗传力分别为(0.317±0.065)、(0.298±0.063),均为中低等遗传力。经似然比检验体重、体长在模型1和模型2间的似然比值均无显著差异(P>0.05),表明模型1和模型2之间无显著差异,模型2为较优遗传模型。以半致死时的存活状态作为耐低温性状指标,遗传力为(0.169±0.078),为低等遗传力。低温下体重、体长之间的表型和遗传相关分别为(0.823±0.010)和(0.969±0.018),为高度正相关;低温下体重、体长与半致死时的存活状态的表型相关分别为(0.187±0.030)和(0.218±0.030),为低度正相关;而遗传相关分别为(0.517±0.205)和(0.538±0.203),为中度正相关。本研究表明,对生长性状进行的选育不会降低其耐低温能力,中国明对虾耐低温性状可与生长性状进行共同复合选育。
关键词:  中国明对虾  生长性状  耐低温性状  半致死时的存活状态
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Evaluation of Genetic Parameters for Growth and Cold Tolerance Traits in Fenneropenaeus chinensis Under Low-Temperature Stress
WANG Mingzhu1,2, MENG Xianhong1,3, KONG Jie1,3, CAO Jiawang1,3, WANG Jun1,2, FENG Yaping1,2, QIANG Guangfeng1,2
1.Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071;2.College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306;3.Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071
Abstract:
In the present study, a preliminary evaluation was conducted on the cold tolerance and growth traits of 69 Fenneropenaeus chinensis by indoor artificial cooling. A linear mixed model with average information restricted maximum likelihood was used to evaluate the genetic parameters. Two animal models were used to evaluate the heritability of body weight (BW) and body length (BL) under low-temperature stress in F. chinensis. The heritability of BW and BL observed in model 1 were (0.206±0.177) and (0.187±0.179), respectively, and for model 2, these were (0.317±0.065) and (0.298±0.063), respectively, which ranged between medium to low. The differences between the two models were tested by likelihood ratio test, and the likelihood ratio values for Model 1 and Model 2 were 1.640 and 1.764, respectively, which were not significantly different (P>0.05). The results showed that the two models were not significantly different, and that model 2 was the optimal model. The heritability of the survival status at half lethal time (SS50) among cold tolerant traits was (0.169±0.078). The phenotypic and genetic correlation coefficients between BW and BL under low-temperature stress were (0.823±0.010) and (0.969±0.018), respectively, which were relatively high. The phenotypic correlation coefficients between BW and SS50; and BL and SS50 were comparatively low with values (0.187±0.030) and (0.218±0.030), respectively. The genetic correlation coefficient between BW and SS50; and BL and SS50 were comparatively high with values (0.517±0.205) and (0.538±0.203), respectively. The results showed that during breeding of F. chinensis, the cold tolerant variety can be selected together with growth traits.
Key words:  Fenneropenaeus chinensis  Growth traits  Cold tolerance traits  Survival status at half lethal time