从一个拮抗选择指数实现了木犀草的遗传参数

J. Campo, L. G. Raya
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引用次数: 4

摘要

在6代重复试验中,对两种高度相关性状进行了同时选择。在3个重复中,每个重复选择2个品系:P+A -为拮抗选择指数,在21 d时增加蛹重,在31 d时减少成虫重;P−A+为拮抗选择指数,在21 d时减少蛹重,在31 d时增加成虫重。基础种群中蛹重与成虫重的遗传相关为0.95。获得了实现遗传力和遗传相关性的估计值,并与全同胞估计值进行了比较。对于总基因型,P+A -系表现出显著的正选择响应,而P - A+系表现出显著的负选择响应。对分化选择的响应是不对称的,对低蛹重和高成虫重系的响应较小,反之亦然。实现遗传率的不对称性较小,与指标遗传率吻合较好。
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Realized genetic parameters from an antagonistic selection index in Tribolium castaneum
Simultaneous selection of two highly correlated traits was practiced in Tribolium castaneum in a replicated experiment for six generations. Two lines were selected in each of three replicates: P+A− for an antagonistic selection index to increase pupal weight at 21 days and decrease adult weight at 31 days, and P−A+ for an antagonistic selection index to decrease pupal weight and increase adult weight. Genetic correlation between pupal and adult weights estimated in the base population was 0.95. Estimates of realized heritabilities and genetic correlation were obtained and compared with full-sib estimates. For the aggregate genotype, the P+A− line had a significant positive selection response, while the P−A+ line showed a significant negative response as would be expected. The response to divergent selection was asymmetrical, being less for the low pupal weight and high adult weight line than vice versa. Less asymmetry was found for the realized heritability, which agreed very well with the index heritabil...
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