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<p>Hybridisation and introgression can significantly impact population structure in plants. The pedunculate (<i>Quercus robur</i> L.) and sessile (<i>Quercus petraea</i> (Matt.) Liebl.) oaks are interfertile, largely sympatric forest species making them suitable for studying how interspecific admixture affects range-wide genetic variation and structure. Focusing on the species’ western margin, 31 Irish stands were genotyped at 29 organelle and 412 nuclear loci before analysing with data from 4,780 trees spanning 438 stands across the entire distribution ranges. Haplotype variation was mapped and maximum likelihood inference of admixture was used to quantify hybridisation and introgression. Evidence for novel organelle haplotype evolution was found in Ireland and range-wide species integrity was high. In Ireland, the frequency of hybridisation and introgressed <i>Q. petraea</i> was very high. Irish <i>Q. petraea</i> had become differentiated from continental trees, whereas <i>Q. robur</i> trees were part of a single northwest European population. A high frequency of introgressed <i>Q</i>. <i>petraea</i> in Ireland is likely a consequence of thousands of years of asymmetric gene flow into <i>Q. robur</i>. Genetically pure bred <i>Q</i>. <i>robur</i> were found to be very rare in Ireland.</p>

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Extensive hybridisation and introgression between two European white oaks at the western limit of their range

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月15日

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  • Samuel Belton,
  • Erica Fox,
  • Bernd Degen,
  • Colin T. Kelleher

摘要

Hybridisation and introgression can significantly impact population structure in plants. The pedunculate (Quercus robur L.) and sessile (Quercus petraea (Matt.) Liebl.) oaks are interfertile, largely sympatric forest species making them suitable for studying how interspecific admixture affects range-wide genetic variation and structure. Focusing on the species’ western margin, 31 Irish stands were genotyped at 29 organelle and 412 nuclear loci before analysing with data from 4,780 trees spanning 438 stands across the entire distribution ranges. Haplotype variation was mapped and maximum likelihood inference of admixture was used to quantify hybridisation and introgression. Evidence for novel organelle haplotype evolution was found in Ireland and range-wide species integrity was high. In Ireland, the frequency of hybridisation and introgressed Q. petraea was very high. Irish Q. petraea had become differentiated from continental trees, whereas Q. robur trees were part of a single northwest European population. A high frequency of introgressed Q. petraea in Ireland is likely a consequence of thousands of years of asymmetric gene flow into Q. robur. Genetically pure bred Q. robur were found to be very rare in Ireland.