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Island plants with newly discovered reproductive traits have higher capacity for uniparental reproduction, supporting Baker’s law
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Island plants with newly discovered reproductive traits have higher capacity for uniparental reproduction, supporting Baker’s law
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Journal Article
Island plants with newly discovered reproductive traits have higher capacity for uniparental reproduction, supporting Baker’s law
2024
Overview
Uniparental reproduction is advantageous when lack of mates limits outcrossing opportunities in plants. Baker’s law predicts an enrichment of uniparental reproduction in habitats colonized via long-distance dispersal, such as volcanic islands. To test it, we analyzed reproductive traits at multiple hierarchical levels and compared seed-set after selfing and crossing experiments in both island and mainland populations of
Limonium lobatum
, a widespread species that Baker assumed to be self-incompatible because it had been described as pollen-stigma dimorphic, i.e., characterized by floral morphs differing in pollen-surface morphology and stigma-papillae shape that are typically self-incompatible. We discovered new types and combinations of pollen and stigma traits hitherto unknown in the literature on pollen-stigma dimorphism and a lack of correspondence between such combinations and pollen compatibility. Contrary to previous reports, we conclude that
Limonium lobatum
comprises both self-compatible and self-incompatible plants characterized by both known and previously undescribed combinations of reproductive traits. Most importantly, plants with novel combinations are overrepresented on islands, selfed seed-set is higher in islands than the mainland, and insular plants with novel pollen-stigma trait-combinations disproportionally contribute to uniparental reproduction on islands. Our results thus support Baker’s law, connecting research on reproductive and island biology.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
