PreprintCited by 36Genetic and phenotypic traits in livestockGenetics and Plant BreedingGenetic Mapping and Diversity in Plants and Animals

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Back to the future: Implications of genetic complexity for hybrid breeding strategies

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Technow, Frank, Podlich, Dean, Cooper, Mark·2020·G3 Genes Genomes Genetics

Abstract

Commercial hybrid breeding operations can be described as decentralized networks of smaller, more or less isolated breeding programs. There is further a tendency for the disproportionate use of successful inbred lines for generating the next generation of recombinants, which has led to a series of significant bottlenecks, particularly in the history of the North American and European maize germplasm. Both the decentralization and the disproportionate inbred use reduce effective population size and constrain the accessible genetic space. Under these conditions, long term response to selection is not expected to be optimal under the classical infinitesimal model of quantitative genetics. In this study we therefore aim to propose an alternative rational for the success of large breeding operations in the context of genetic complexity arising from the structure and properties of interactive genetic networks. For this we use simulations based on the NK model of genetic architecture. We indeed found that constraining genetic space and reducing effective population size, through program decentralization and disproportionate inbred use, is required to expose additive genetic variation and thus facilitate heritable genetic gains. These results introduce new insights into why the historically grown structure of hybrid breeding programs was successful in improving the yield potential of hybrid crops over the last century. We also hope that a renewed appreciation for “why things worked” in the past can guide the adoption of novel technologies and the design of future breeding strategies for navigating biological complexity.

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Metadata

Authors
Technow, F., Podlich, D., & Cooper, M.
Affiliations
  • Corteva (United States) (US)
  • The University of Queensland (AU)
Corresponding author
Technow, Frank
Venue
G3 Genes Genomes Genetics
Publisher
openRxiv
Published
2020-10-22
Volume
11
Issue
7
ISSN
2160-1836 (ISSN-L)
OpenAlex
W3157080093
Cited by
36
References
0
Citations by year
2026: 10 · 2025: 7 · 2024: 3 · 2023: 4 · 2022: 5 · 2021: 7
FWCI
2.69
Type
journal article
Language
en
Open access
Locations
  • G3 Genes Genomes Genetics (publishedVersion, cc-by-nc-nd)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion)
  • Europe PMC (PubMed Central) (publishedVersion, other-oa)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
Funders
  • Corteva Agriscience
  • Australian Research Council (CE200100015)
  • Australian Research Council Centre of Excellence for Plant Success in Nature and Agriculture (CE 200100015)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic and phenotypic traits in livestock
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Genetics and Plant Breeding
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Mapping and Diversity in Plants and Animals
Keywords
maize, inbred lines, genetic complexity, NK model, genetic architecture, effective population size, population bottleneck, additive genetic variance, selection response, infinitesimal model
MeSH terms
Plant Breeding, Zea mays, Crops, Agricultural

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