Island plants with newly discovered reproductive traits have higher capacity for uniparental reproduction, supporting Baker's law.

Autor: Keller B; Department of Systematic and Evolutionary Botany, University of Zurich, Zurich, Switzerland. barbara.keller@systbot.uzh.ch., Alther B; Department of Systematic and Evolutionary Botany, University of Zurich, Zurich, Switzerland., Jiménez A; Department of Systematic and Evolutionary Botany, University of Zurich, Zurich, Switzerland., Koutroumpa K; Department of Systematic and Evolutionary Botany, University of Zurich, Zurich, Switzerland.; Botanischer Garten und Botanisches Museum Berlin (BGBM), Freie Universität Berlin, Berlin, Germany., Mora-Carrera E; Department of Systematic and Evolutionary Botany, University of Zurich, Zurich, Switzerland., Conti E; Department of Systematic and Evolutionary Botany, University of Zurich, Zurich, Switzerland.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2024 May 18; Vol. 14 (1), pp. 11392. Date of Electronic Publication: 2024 May 18.
DOI: 10.1038/s41598-024-62065-4
Abstrakt: 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.
(© 2024. The Author(s).)
Databáze: MEDLINE
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