Cross potential selection: a proposal for optimizing crossing combinations in recurrent selection using the usefulness criterion of future inbred lines.

IF 2.1 3区 生物学 Q3 GENETICS & HEREDITY
Kengo Sakurai, Kosuke Hamazaki, Minoru Inamori, Akito Kaga, Hiroyoshi Iwata
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Abstract

In plant breeding programs, rapid production of novel varieties is highly desirable. Genomic selection allows the selection of superior individuals based on genomic estimated breeding values. However, it is worth noting that superior individuals may not always be superior parents. The choice of the crossing pair significantly influences the genotypic value of the resulting progeny. This study has introduced a new crossing strategy, termed cross potential selection, designed to expedite the production of novel varieties of inbred crops. Cross potential selection integrates fast recurrent selection and usefulness criterion to generate novel varieties. It considers the segregation of each crossing pair and computes the expected genotypic values of the top-performing individuals, assuming that the progeny distribution of genotypic values follows a normal distribution. It does not consider genetic diversity and focuses only on producing a novel variety as soon as possible. We simulated a 30-year breeding program in 2 scenarios, low heritability (h2=0.3) and high heritability (h2=0.6), to compare cross potential selection with 2 other selection strategies. Cross potential selection consistently demonstrated the highest genetic gains among the 3 strategies in early cycles. In the 3rd year of the breeding program with a high heritability (h2=0.6), cross potential selection exhibited the highest genetic gains, 138 times that of 300 independent breeding simulations. Regarding long-term improvement, the other selection strategies outperformed cross potential selection. Nevertheless, compared with the other 2 strategies, cross potential selection achieved significant short-term genetic improvements. Cross potential selection is a suitable breeding strategy for the rapid production of varieties within limited time and cost.

杂交潜力选择:利用未来近交系的有用性标准优化循环选择中的杂交组合的建议。
在植物育种计划中,快速培育新品种是非常理想的。基因组选择可根据基因组估计育种值选择优良个体。但值得注意的是,优良个体不一定总是优良亲本。杂交配对的选择对所产生后代的基因型价值有很大影响。本研究引入了一种新的杂交策略,称为杂交潜力选择(CPS),旨在加快近交作物新品种的培育。CPS 整合了快速循环选择和实用性标准,以培育新品种。它考虑了每对杂交组合的分离情况,并假定后代基因型值的分布遵循正态分布,计算出表现最好的个体的预期基因型值。它不考虑遗传多样性,只关注尽快培育出新品种。我们模拟了低遗传率(h2 = 0.3)和高遗传率(h2 = 0.6)两种情况下的 30 年育种计划,以比较 CPS 和其他两种选择策略。在早期周期中,CPS 始终是三种策略中遗传收益最高的。在高遗传率(h2 = 0.6)育种计划的第三年,CPS 的遗传收益最高,是 300 次独立育种模拟的 138 倍。在长期改良方面,其他选择策略的表现优于 CPS。然而,与其他两种策略相比,CPS 在短期内实现了显著的遗传改良。CPS 是一种适合在有限时间和成本内快速培育品种的育种策略。
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来源期刊
G3: Genes|Genomes|Genetics
G3: Genes|Genomes|Genetics GENETICS & HEREDITY-
CiteScore
5.10
自引率
3.80%
发文量
305
审稿时长
3-8 weeks
期刊介绍: G3: Genes, Genomes, Genetics provides a forum for the publication of high‐quality foundational research, particularly research that generates useful genetic and genomic information such as genome maps, single gene studies, genome‐wide association and QTL studies, as well as genome reports, mutant screens, and advances in methods and technology. The Editorial Board of G3 believes that rapid dissemination of these data is the necessary foundation for analysis that leads to mechanistic insights. G3, published by the Genetics Society of America, meets the critical and growing need of the genetics community for rapid review and publication of important results in all areas of genetics. G3 offers the opportunity to publish the puzzling finding or to present unpublished results that may not have been submitted for review and publication due to a perceived lack of a potential high-impact finding. G3 has earned the DOAJ Seal, which is a mark of certification for open access journals, awarded by DOAJ to journals that achieve a high level of openness, adhere to Best Practice and high publishing standards.
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