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<p>The hexaploid sweetpotato (<i>Ipomoea batatas</i> [L.] Lam.) is a globally important stable crop that plays a key role in biofortification. Its high resilience and adaptability provide distinct advantages in addressing food security and climate challenges. Here we report a haplotype-resolved chromosome-level genome assembly of an African cultivar, ‘Tanzania’, revealing mosaic genomic origins along haplotype-phased chromosomes. The wild tetraploid <i>I. aequatoriensis</i>, currently found in coastal Ecuador, contributes to a substantial fraction of the sweetpotato genome. Another large proportion of the genome shows a closer genetic relationship to the wild tetraploid <i>I. batatas</i> 4×, distributed in Central America. The sequences contributed by different wild species are not distributed in typical subgenomes but are intertwined along chromosomes, possibly owing to the known non-preferential recombination among sweetpotato haplotypes. This study improves our understanding of sweetpotato origin and genome architecture and provides valuable genomic resources to accelerate sweetpotato breeding.</p>

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Phased chromosome-level assembly provides insight into the genome architecture of hexaploid sweetpotato

  • 期刊论文

  • 发表日期：

    2025年8月8日

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  • Shan Wu,
  • Honghe Sun,
  • Xuebo Zhao,
  • John P. Hamilton,
  • Marcelo Mollinari,
  • Gabriel De Siqueira Gesteira,
  • Mercy Kitavi,
  • Mengxiao Yan,
  • Hongxia Wang,
  • Jun Yang,
  • G. Craig Yencho,
  • C. Robin Buell,
  • Zhangjun Fei

摘要

The hexaploid sweetpotato (Ipomoea batatas [L.] Lam.) is a globally important stable crop that plays a key role in biofortification. Its high resilience and adaptability provide distinct advantages in addressing food security and climate challenges. Here we report a haplotype-resolved chromosome-level genome assembly of an African cultivar, ‘Tanzania’, revealing mosaic genomic origins along haplotype-phased chromosomes. The wild tetraploid I. aequatoriensis, currently found in coastal Ecuador, contributes to a substantial fraction of the sweetpotato genome. Another large proportion of the genome shows a closer genetic relationship to the wild tetraploid I. batatas 4×, distributed in Central America. The sequences contributed by different wild species are not distributed in typical subgenomes but are intertwined along chromosomes, possibly owing to the known non-preferential recombination among sweetpotato haplotypes. This study improves our understanding of sweetpotato origin and genome architecture and provides valuable genomic resources to accelerate sweetpotato breeding.