ArticleAnnals of botany2018
Evolutionary and functional potential of ploidy increase within individual plants: somatic ploidy mapping of the complex labellum of sexually deceptive bee orchids.
Article in Annals of botany, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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Who cites it
8 citing papers in PubMed.
- A chromosome-level genome assembly of Vanilla planifolia uncovers the genomic architecture underlying partial endoreplication.BMC genomics · 2026Article
- Osmophore Structure and Labellum Micromorphology inPlants (Basel, Switzerland) · 2024Article
- Morphological Continua Make Poor Species: Genus-Wide Morphometric Survey of the European Bee Orchids (Biology · 2023Article
- Genome Size and Labellum Epidermal Cell Size Are Evolutionarily Correlated With Floral Longevity inFrontiers in plant science · 2021Article
- Article
- Anatomy, Flow Cytometry, and X-Ray Tomography Reveal Tissue Organization and Ploidy Distribution in Long-TermFrontiers in plant science · 2020Article
- Do Specialized Cells Play a Major Role in Organic Xenobiotic Detoxification in Higher Plants?Frontiers in plant science · 2020Article
- Integrating restriction site-associated DNA sequencing (RAD-seq) with morphological cladistic analysis clarifies evolutionary relationships among major species groups of bee orchids.Annals of botany · 2018Article
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Authors and funding
6 authors.
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No grant is acknowledged in the PubMed record.
Abstract
Background and Aims: Recent tissue-level observations made indirectly via flow cytometry suggest that endoreplication (duplication of the nuclear genome within the nuclear envelope in the absence of subsequent cell division) is widespread within the plant kingdom. Here, we also directly observe ploidy variation among cells within individual petals, relating size of nucleus to cell micromorphology and (more speculatively) to function. Methods: We compared the labella (specialized pollinator-attracting petals) of two European orchid genera: Dactylorhiza has a known predisposition to organismal polyploidy, whereas Ophrys exhibits exceptionally complex epidermal patterning that aids pseudocopulatory pollination. Confocal microscopy using multiple staining techniques allowed us to observe directly both the sizes and the internal structures of individual nuclei across each labellum, while flow cytometry was used to test for progressively partial endoreplication. Key Results: In Dactylorhiza, endoreplication was comparatively infrequent, reached only low levels, and appeared randomly located across the labellum, whereas in Ophrys endoreplication was commonplace, being most frequent in large peripheral trichomes. Endoreplicated nuclei reflected both endomitosis and endocycling, the latter reaching the third round of genome doubling (16C) to generate polytene nuclei. All Ophrys individuals studied exhibited progressively partial endoreplication. Conclusions: Comparison of the two genera failed to demonstrate the hypothesized pattern of frequent polyploid speciation in genera showing extensive endoreplication. Endoreplication in Ophrys appears more strongly positively correlated with cell size/complexity than with cell location or secretory role. Epigenetic control of gene overexpression by localized induction of endoreplication within individual plant organs may represent a significant component of a plant's developmental programme, contributing substantially to organ plasticity.
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