ArticleAmerican journal of botany2023
Is there hybridization between diploid and tetraploid Euphrasia in a secondary contact zone?
Article in American journal of botany, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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3 citing papers in PubMed, 7 citations in OpenAlex.
- Distribution response of the diploid hybrid species Hippophae goniocarpa to climate change based on a three-dimensional geographic gradient.BMC plant biology · 2026Article
- The puzzle of plant hybridisation: a high propensity to hybridise but few hybrid zones reported.Heredity · 2023Review
- Is there hybridization between diploid and tetraploid Euphrasia in a secondary contact zone?American journal of botany · 2023Article
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Authors and funding
4 authors at 3 institutions in 2 countries.
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No grant is acknowledged in the PubMed record.
Abstract
premiseStrong postzygotic reproductive isolating barriers are usually expected to limit the extent of natural hybridization between species with contrasting ploidy. However, genomic sequencing has revealed previously overlooked examples of natural cross-ploidy hybridization in some flowering plant genera, suggesting that the phenomenon may be more common than once thought. We investigated potential cross-ploidy hybridization in British eyebrights (Euphrasia, Orobanchaceae), a group from which 13 putative cross-ploidy hybrid combinations have been reported based on morphology.
methodsWe analyzed a contact zone between diploid Euphrasia rostkoviana and tetraploid E. arctica in Wales. We sequenced part of the internal transcribed spacer (ITS) of nuclear ribosomal DNA and used genotyping by sequencing (GBS) to look for evidence of cross-ploidy hybridization and introgression.
resultsCommon variant sites in the ITS region were fixed between diploids and tetraploids, indicating a strong barrier to hybridization. Clustering analyses of 356 single-nucleotide polymorphisms (SNPs) generated using GBS clearly separated samples by ploidy and revealed strong genetic structure (F
conclusionsOur results suggest that recent cross-ploidy hybridization is rare or absent in a site of secondary contact in Euphrasia. While a strong ploidy barrier prevents hybridization over ecological timescales, such hybrids may form in stable populations over evolutionary timescales, potentially allowing cross-ploidy introgression to take place.
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