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<p>Complex chromosome pairing and separation occur in triploid individuals during meiosis, which affect the genetic composition and fertility of gametes. In the present study, compared with the diploid control <i>Populus</i> ‘84 K’ that exhibited regular and synchronous meiosis with normal microspore formation, the triploid hybrid clone ‘Beilinxiongzhu 1#’ displayed numerous meiotic abnormalities, such as univalents, premature chromosome migration, lagging chromosomes, chromosome bridges, asymmetric segregation, and premature cytokinesis. These abnormalities contributed to the unbalanced allocation of genetic material, which seriously affected gamete fertility. A total of 393 progeny were generated by crossing ‘Beilinxiongzhu 1#’ with diploid <i>Populus</i> ‘YXY 7#’, suggesting that not all gametes produced by triploid <i>Populus</i> were aborted. Nineteen SSR polymorphic primers distributed on 19 chromosomes were screened to analyze the parental heterozygosity transmitted to 393 progeny. The transmitted paternal heterozygosity values for the hyper-diploids, hypo-triploids, hyper-triploids, and hypo-tetraploids were 0.627, 0.677, 0.825, and 0.905, respectively, indicating that the viable pollen grains of ‘Beilinxiongzhu 1#’ transmitted higher heterozygosity to progeny. Our findings confirm that aneuploids will play an important role in the genetic improvement of <i>Populus</i>.</p>

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Aneuploid gametes produced by triploid Populus ‘Beilinxiongzhu 1#’ transmit higher paternal heterozygosity to progeny

  • 期刊论文

  • 发表日期：

    2026年5月29日

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  • Yaru Sang,
  • Yunyun Xie,
  • Yifan Zhao,
  • Bo Kong,
  • Dawei Cheng,
  • Liang Li,
  • Lexun Ma,
  • Jiahua Du,
  • Meiling Long,
  • Dongliang Cao,
  • Zhang Huajian,
  • Lao Huiqi,
  • Zhao Yaqi,
  • Pingdong Zhang

摘要

Complex chromosome pairing and separation occur in triploid individuals during meiosis, which affect the genetic composition and fertility of gametes. In the present study, compared with the diploid control Populus ‘84 K’ that exhibited regular and synchronous meiosis with normal microspore formation, the triploid hybrid clone ‘Beilinxiongzhu 1#’ displayed numerous meiotic abnormalities, such as univalents, premature chromosome migration, lagging chromosomes, chromosome bridges, asymmetric segregation, and premature cytokinesis. These abnormalities contributed to the unbalanced allocation of genetic material, which seriously affected gamete fertility. A total of 393 progeny were generated by crossing ‘Beilinxiongzhu 1#’ with diploid Populus ‘YXY 7#’, suggesting that not all gametes produced by triploid Populus were aborted. Nineteen SSR polymorphic primers distributed on 19 chromosomes were screened to analyze the parental heterozygosity transmitted to 393 progeny. The transmitted paternal heterozygosity values for the hyper-diploids, hypo-triploids, hyper-triploids, and hypo-tetraploids were 0.627, 0.677, 0.825, and 0.905, respectively, indicating that the viable pollen grains of ‘Beilinxiongzhu 1#’ transmitted higher heterozygosity to progeny. Our findings confirm that aneuploids will play an important role in the genetic improvement of Populus.