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Unraveling the hexaploid sweetpotato inheritance using ultra-dense multilocus mapping

View ORCID ProfileMarcelo Mollinari, View ORCID ProfileBode A. Olukolu, View ORCID ProfileGuilherme da S. Pereira, Awais Khan, View ORCID ProfileDorcus Gemenet, View ORCID ProfileCraig Yencho, View ORCID ProfileZhao-Bang Zeng
doi: https://doi.org/10.1101/689638
Marcelo Mollinari
1Bioinformatics Research Center, North Carolina State University, Raleigh, North Carolina, USA
2Department of Horticultural Science, North Carolina State University, Raleigh, North Carolina, USA
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  • ORCID record for Marcelo Mollinari
  • For correspondence: mmollin@ncsu.edu
Bode A. Olukolu
3Department of Entomology and Plant Pathology, University of Tennessee, Knoxville, Tennessee, USA
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Guilherme da S. Pereira
1Bioinformatics Research Center, North Carolina State University, Raleigh, North Carolina, USA
2Department of Horticultural Science, North Carolina State University, Raleigh, North Carolina, USA
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Awais Khan
4Plant Pathology and Plant-Microbe Biology Section, Cornell University, Geneva, New York, USA
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Dorcus Gemenet
5International Potato Center, ILRI Campus, Nairobi, Kenya
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Craig Yencho
2Department of Horticultural Science, North Carolina State University, Raleigh, North Carolina, USA
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Zhao-Bang Zeng
1Bioinformatics Research Center, North Carolina State University, Raleigh, North Carolina, USA
2Department of Horticultural Science, North Carolina State University, Raleigh, North Carolina, USA
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Abstract

The hexaploid sweetpotato (Ipomoea batatas (L.) Lam., 2n = 6x = 90) is an important staple food crop worldwide and has a vital role in alleviating famine in developing countries. Due to its high ploidy level, genetic studies in sweetpotato lag behind major diploid crops significantly. We built an ultra-dense multilocus integrated genetic map and characterized the inheritance system in a sweetpotato full-sib family using our newly implemented software, MAPpoly. The resulting genetic map revealed 96.5% collinearity between I. batatas and its diploid relative I. trifida. We computed the genotypic probabilities across the whole genome for all individuals in the mapping population and inferred their complete hexaploid haplotypes. We provide evidence that most of the meiotic configurations (73.3%) were resolved in bivalents, although a small portion of multivalent signatures (15.7%), among other inconclusive configurations (11.0%) were also observed. Except for low levels of preferential pairing in linkage group 2, we observed a hexasomic inheritance mechanism in all linkage groups. We propose that the hexasomic-bivalent inheritance promotes stability to the allelic transmission in sweetpotato.

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Posted July 02, 2019.
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Unraveling the hexaploid sweetpotato inheritance using ultra-dense multilocus mapping
Marcelo Mollinari, Bode A. Olukolu, Guilherme da S. Pereira, Awais Khan, Dorcus Gemenet, Craig Yencho, Zhao-Bang Zeng
bioRxiv 689638; doi: https://doi.org/10.1101/689638
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Unraveling the hexaploid sweetpotato inheritance using ultra-dense multilocus mapping
Marcelo Mollinari, Bode A. Olukolu, Guilherme da S. Pereira, Awais Khan, Dorcus Gemenet, Craig Yencho, Zhao-Bang Zeng
bioRxiv 689638; doi: https://doi.org/10.1101/689638

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