跨育种队伍的随机化提高了传统和基因组选择的准确性
Arlyn Ackerman1, Jessica Rutkoski2
1Breeding Insight, Cornell University, Ithaca, New York, USA.
The plant genome
|March 17, 2026
概括
完全随机化可以提高育种价值估计的准确性,特别是在具有挑战性的条件下. 基因组数据在很大程度上减轻了这种设计效应,但基因组支持的稀疏测试仍然受益于完整的随机化,以提高选择准确度.
科学领域:
- 植物育种 植物育种
- 定量遗传学 是一种定量遗传学.
- 基因组选择 基因组选择
背景情况:
- 传统的育种试验经常单独评估队列,有可能混环境和遗传差异.
- 这种混可以降低估计育种价值的准确性,这是开发改进作物品种的关键步骤.
研究的目的:
- 为了比较在试验中的受限与完全随机化的队列的选择准确性.
- 评估随机化对传统 (BLUP),基因组 (GBLUP) 和基因组支持的稀疏测试方法的影响.
主要方法:
- 使用冬季小麦标记数据进行in silico模拟.
- 在不同的遗传性 (0.2-0.8),遗传相关性 (0.2-1.0) 和复制水平上进行评估.
- 差异差异 (DiD) 分析以确定设计性能的因果推理.
主要成果:
- 完全随机化将传统BLUP精度提高了11.7%,在低复制和遗传相关性条件下获得更大的收益.
- 基因组BLUP (GBLUP) 没有显著的设计效应,表明基因组数据减轻了随机化问题.
- 基因组支持的稀疏测试从完全随机化中受益,在具有挑战性的条件下显示1.5%至5.5%的准确性改善.
结论:
- 完全随机化为育种计划提供了优势,特别是当基因组数据有限或条件具有挑战性时.
- 基因组数据在很大程度上克服了受限随机化的局限性,但完全随机化仍然为基因组支持的稀疏测试提供了好处.
- 测试区域之间的遗传相关性是影响随机化方案之间性能差异的关键因素.
相关概念视频
Genetic Variation
1.5K
Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
Genes exist in different versions called alleles,...
Genes exist in different versions called alleles,...
1.5K
Genetic Screens
5.8K
Genetic screens are tools used to identify genes and mutations responsible for phenotypes of interest. Genetic screens help identify individuals or a group of people at risk of developing genetic diseases and help them with early intervention, targeted therapy, and reproductive options.
Forward genetic screens
Forward or “classical” genetic screens involve creating random mutations in an organism’s DNA using radiation, mutagens, or insertion of additional bases, which...
Forward genetic screens
Forward or “classical” genetic screens involve creating random mutations in an organism’s DNA using radiation, mutagens, or insertion of additional bases, which...
5.8K
Randomized Experiments
9.3K
The randomization process involves assigning study participants randomly to experimental or control groups based on their probability of being equally assigned. Randomization is meant to eliminate selection bias and balance known and unknown confounding factors so that the control group is similar to the treatment group as much as possible. A computer program and a random number generator can be used to assign participants to groups in a way that minimizes bias.
Simple randomization
Simple...
Simple randomization
Simple...
9.3K
Mutation, Gene Flow, and Genetic Drift
65.6K
In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
65.6K
Gene Conversion
10.8K
Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
10.8K
Genetic Drift
44.9K
Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.
44.9K


