ArticleAnnals of botany2020
The role of multiple reproductive barriers: strong post-pollination interactions govern cytotype isolation in a tetraploid-octoploid contact zone.
Article in Annals of botany, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 13 papers.
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13 citing papers in PubMed.
- Cross-ploidy hybridisation in Alpine woodrushes is associated with ecological additivity and scale-dependent niche divergence.The New phytologist · 2026Article
- Co-flowering with congeners does not affect buzz-pollinator specialization and pollination performance in Rhexia mariana, but does affect floral trait variance.American journal of botany · 2025Article
- Insect visitation patterns in diploid Centaurea aspera and its related allotetraploid and triploid hybrids: Similar rates but distinct assemblages.American journal of botany · 2025Article
- Can ploidy changes propel the evolution of allogamy in a selfing species complex?BMC plant biology · 2025Article
- Overcoming Ploidy Barriers: The Role of Triploid Bridges in the Genetic Introgression of Cardamine amara.Molecular ecology · 2025Article
- The ecology of polyploid establishment and exclusion, with implications for polyploid biogeography.The New phytologist · 2025Review
- Spatial Distribution of Genetic, Ploidy, and Morphological Variation of the Edaphic Steno-EndemicPlants (Basel, Switzerland) · 2025Article
- Synthesis and Scope of the Role of Postmating Prezygotic Isolation in Speciation.Cold Spring Harbor perspectives in biology · 2024Review
- Pre- and post-pollination barriers between two exotic and five nativePlant diversity · 2023Article
- Morphological and environmental differentiation as prezygotic reproductive barriers between parapatric and allopatric Campanula rotundifolia agg. cytotypes.Annals of botany · 2023Article
- Multiple lines of evidence supports the two varieties ofPlant diversity · 2022Article
- The influence of self-pollen deposition on female reproductive success in a self-incompatible plant,Frontiers in plant science · 2022Article
- Why is reproductive isolation between intraspecific cytotypes so important? A commentary on: 'Strong post-pollination interactions govern cytotype isolation in a tetraploid-octoploid contact zone'.Annals of botany · 2020Article
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No grant is acknowledged in the PubMed record.
Abstract
BACKGROUND AND
aimsPolyploidy is an important contributor to sympatric speciation and assortative mating is a key mechanism driving cytotype interactions in contact zones. While strong reproductive barriers can mediate the coexistence of different cytotypes in sympatry, positive frequency-dependent mating disadvantage ultimately drives the transition to single-ploidy populations. However, comprehensive estimates of reproductive isolation among cytotypes and across multiple barriers are rare. We quantify the strength of isolation across multiple reproductive stages in a tetraploid-octoploid contact zone to understand the potential for coexistence.
methodsAssortative mating due to flowering asynchrony, pollinator behaviour, morphological overlap, self-fertilization and gametic competition between tetraploid and octoploid Gladiolus communis in a contact zone in the Western Iberian Peninsula were assessed in natural and experimental populations to quantify reproductive isolation (RI) between cytotypes. KEY
resultsTetraploids and octoploids have a high degree of overlap in flowering time and similar floral morphology, and are visited by generalist insects without cytotype foraging preferences, resulting in weak pre-pollination RI (from 0.00 to 0.21). In contrast, post-pollination isolation resulting from gametic selection was a strong barrier to inter-cytotype mating, with ploidy composition in stigmatic pollen loads determining the levels of RI (from 0.54 to 1.00). Between-cytotype cross-incompatibility was relatively high (RI from 0.54 to 0.63) as was isolation acquired through self-pollination (RI of 0.59 in tetraploids and 0.39 in octoploids).
conclusionsTotal RI was high for both tetraploids (from 0.90 to 1.00) and octoploids (from 0.78 to 0.98). Such high rates of assortative mating will enable cytotype coexistence in mixed-ploidy populations by weakening the impacts of minority cytotype exclusion. This study reveals the key role of gametic selection in cytotype siring success and highlights the importance of comprehensive estimates across multiple reproductive barriers to understand cytotype interactions at contact zones.
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