ArticleAnnals of botany2019
Population structure of Betula albosinensis and Betula platyphylla: evidence for hybridization and a cryptic lineage.
Article in Annals of botany, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.
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9 citing papers in PubMed.
- Molecular signatures of adaptive introgression and selection in contact zones of closely related pine species (Pinus genus).BMC plant biology · 2025Article
- Hybridization has localized effect on genetic variation in closely related pine species.BMC plant biology · 2024Article
- Deep genome skimming reveals the hybrid origin ofPlant diversity · 2024Article
- Article
- Differences in Leaf Morphology and Related Gene Expression between Diploid and Tetraploid Birch (International journal of molecular sciences · 2022Article
- Molecular and morphological analyses clarify species delimitation in section Costatae and reveal Betula buggsii sp. nov. (sect. Costatae, Betulaceae) in China.Annals of botany · 2022Article
- Article
- So Closely Related and Yet So Different: Strong Contrasts Between the Evolutionary Histories of Species of theFrontiers in plant science · 2020Article
- Population genetic structures of two ecologically distinct speciesEcology and evolution · 2019Article
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6 authors.
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Abstract
BACKGROUND AND
aimsDifferences in local abundance and ploidy level are predicted to impact the direction of introgression between species. Here, we tested these hypotheses on populations of Betula albosinensis (red birch) and Betula platyphylla (white birch) which were thought to differ in ploidy level, the former being tetraploid and the latter diploid.
methodsWe sampled 391 birch individuals from nine localities in China, and classified them into species based on leaf morphology. Twelve nuclear microsatellite markers were genotyped in each sample, and analysed using principal coordinates analysis and STRUCTURE software. We compared the effects of two different methods of scoring polyploid genotypes on population genetic analyses. We analysed the effect of ploidy, local species abundance and latitude on levels of introgression between the species. KEY
resultsLeaf morphology divided our samples into red and white birch, but genetic analyses unexpectedly revealed two groups within red birch, one of which was tetraploid, as expected, but the other of which appeared to have diploid microsatellite genotypes. Five individuals were identified as early-generation hybrids or backcrosses between white birch and red birch and five were identified between red birch and 'diploid' red birch. Cline analysis showed that levels of admixture were not significantly correlated with latitude. Estimated genetic differentiation among species was not significantly different between determined tetraploid and undetermined tetraploid genotypes.
conclusionsLimited hybridization and gene flow have occurred between red birch and white birch. Relative species abundance and ploidy level do not impact the direction of introgression between them, as genetic admixture is roughly symmetrical. We unexpectedly found populations of apparently diploid red birch and this taxon may be a progenitor of allotetraploid red birch populations. Incomplete lineage sorting may explain patterns of genetic admixture between apparently diploid and allotetraploid red birch.
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