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QTL analysis and GWAS of agronomic traits in sweetpotato (Ipomoea batatas L.) using genome wide SNPs.

Authors
  • Haque, Emdadul1
  • Tabuchi, Hiroaki1
  • Monden, Yuki2
  • Suematsu, Keisuke1
  • Shirasawa, Kenta3
  • Isobe, Sachiko3
  • Tanaka, Masaru1
  • 1 Kyushu Okinawa Agricultural Research Center, NARO, 6651-2 Yokoichi-cho, Miyakonojo, Miyazaki 885-0091, Japan. , (Japan)
  • 2 Graduate School of Environmental and Life Science, Okayama University, 1-1-1 Tsushimanaka, Kita-ku, Okayama, Okayama 700-8530, Japan. , (Japan)
  • 3 Kazusa DNA Research Institute, 2-6-7 Kazusa-Kamatari, Kisarazu, Chiba 292-0818, Japan. , (Japan)
Type
Published Article
Journal
Breeding science
Publication Date
Jun 01, 2020
Volume
70
Issue
3
Pages
283–291
Identifiers
DOI: 10.1270/jsbbs.19099
PMID: 32714050
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

While sweetpotato (Ipomoea batatas L.) improvement has generally been done by field-based selection, molecular genetic studies on traits of interest, i.e., molecular markers are needed for enhancing the breeding program of this world's 7th most important crop, as such markers facilitate marker-assisted selection. Here, we performed a combined approach of QTLs analyses and GWAS of storage root β-carotene content (BC), dry-matter (DM) and starch content (SC) using the genetic linkage maps constructed with 5,952 and 5,640 SNPs obtained from F1 progenies between cultivars 'J-Red' and 'Choshu'. BC was negatively correlated with DM (r = -0.45) and SC (r = -0.51), while DM was positively correlated with SC (r = 0.94). In both parental maps, a total of five, two and five QTL regions on linkage groups 7 and 8 were associated with BC, DM and SC, respectively. In GWAS of BC, one strong signal (P = 1.04 × 10-9) was observed on linkage group 8, which co-located with one of the above QTL regions. The SNPs markers found here, particularly for β-carotene, would be useful base resources for future marker-assisted selection program with this trait. Copyright © 2020 by JAPANESE SOCIETY OF BREEDING.

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