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<p>Theory predicts that in the absence of selection, a newly formed segmental allopolyploid will become ‘autopolyploidized’ if homoeologous exchanges (HEs) occur freely. Moreover, because selection against meiotic abnormalities is expected to be strong in the initial generations, we anticipate HEs to be uncommon in evolved segmental allopolyploids. Here we analysed the whole-genome composition of 202 phenotypically homogeneous and stable rice tetraploid recombinant inbred lines (TRILs) derived from <i>Oryza sativa</i> subsp. <i>japonica</i> subsp. <i>indica</i> hybridization/whole-genome doubling. We measured functional traits related to growth, development and reproductive fitness, and analysed meiotic chromosomal behaviour of the TRILs. We uncover factors that constrain the genomic composition of the TRILs, including asymmetric parental contribution and exclusive uniparental segment retention. Intriguingly, some TRILs that have high fertility and abiotic stress resilience co-occur with largely stabilized meiosis. Our findings comprise evidence supporting the evolutionary possibility of HE-catalysed ‘allo-to-auto’ polyploidy transitions in nature, with implications for creating new polyploid crops.</p>

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Rapid formation of stable autotetraploid rice from genome-doubled F1 hybrids of japonica–indica subspecies

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月31日

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  • Xu Han,
  • Jiahao Li,
  • Guo Li,
  • Zhibin Zhang,
  • Taotao Lian,
  • Bingqi Zhang,
  • Ting Luo,
  • Ruili Lv,
  • Xiaojing Cai,
  • Xiuyun Lin,
  • Chunming Xu,
  • Ying Wu,
  • Lei Gong,
  • Jonathan F. Wendel,
  • Bao Liu

摘要

Theory predicts that in the absence of selection, a newly formed segmental allopolyploid will become ‘autopolyploidized’ if homoeologous exchanges (HEs) occur freely. Moreover, because selection against meiotic abnormalities is expected to be strong in the initial generations, we anticipate HEs to be uncommon in evolved segmental allopolyploids. Here we analysed the whole-genome composition of 202 phenotypically homogeneous and stable rice tetraploid recombinant inbred lines (TRILs) derived from Oryza sativa subsp. japonica subsp. indica hybridization/whole-genome doubling. We measured functional traits related to growth, development and reproductive fitness, and analysed meiotic chromosomal behaviour of the TRILs. We uncover factors that constrain the genomic composition of the TRILs, including asymmetric parental contribution and exclusive uniparental segment retention. Intriguingly, some TRILs that have high fertility and abiotic stress resilience co-occur with largely stabilized meiosis. Our findings comprise evidence supporting the evolutionary possibility of HE-catalysed ‘allo-to-auto’ polyploidy transitions in nature, with implications for creating new polyploid crops.