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Simulation-based optimization of genomic selection scheme for accelerating genetic gain while preventing inbreeding depression in onion breeding.

Authors
  • Sekine, Daisuke1
  • Yabe, Shiori2
  • 1 Institute of Vegetable and Floriculture Science, National agriculture and Food Research Organization, Tsu, Mie 514-2392, Japan. , (Japan)
  • 2 Institute of Crop Science, National Agriculture and Food Research Organization, Tsukuba, Ibaraki 305-8518, Japan. , (Japan)
Type
Published Article
Journal
Breeding science
Publication Date
Dec 01, 2020
Volume
70
Issue
5
Pages
594–604
Identifiers
DOI: 10.1270/jsbbs.20047
PMID: 33603556
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Genomic selection (GS) is being increasingly employed in plant breeding programs to accelerate genetic gain of economically important traits. However, its efficiency differs greatly across species, due to differences in reproduction and breeding strategies. Onion (Allium cepa L.) is an out-crossing crop but can be easily self-pollinated. High inbreeding depression occurs, and contamination of self-pollinated seeds is unavoidable in onion breeding. Taking this into consideration, 10-year breeding programs with and without GS were simulated. In addition to general GS, we proposed GS schemes to prevent inbreeding depression by avoiding co-selection of close relatives and combining the shortening of generation time and updating of the prediction model. The results showed that general GS with shortening of generation time yielded the highest genetic gain among the selection schemes in early years. However, inbreeding increased rapidly, reaching very high levels in later years. The proposed GS combining shortening of generation time with updating of the prediction model was superior to the others in later years, as it yielded relatively high genetic gain while maintaining significantly low levels of inbreeding. These results suggested that GS can be beneficial in onion breeding, and an optimal scheme should be selected depending on the selection period. Copyright © 2020 by JAPANESE SOCIETY OF BREEDING.

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