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Can the meiotic sex ratio explain the sex ratio bias in adult populations in the dioecious moss Drepanocladus lycopodioides?
Swedish Museum of Natural History, Department of Botany. (Reproductive Biology of Bryophytes)
Swedish Museum of Natural History, Department of Botany.
Lunds universitet.ORCID iD: 0000-0002-3369-8420
2017 (English)In: Journal of Bryology, ISSN 0373-6687, E-ISSN 1743-2820Article in journal (Refereed) Accepted
Abstract [en]

Sex ratio variation is commonly observed in natural populations of many organisms with separate sexes and genetic sex determination, including bryophytes. Most bryophyte populations exhibit female-skewed expressed adult sex ratios, generally inferred from counts of sexually mature plants. For the rarely sexually reproducing perennial dioecious moss Drepanocladus lycopodioides, we showed that a female bias also exists  in the genetic adult sex ratio, using a specifically designed molecular sex-associated marker. Here, we investigated whether the meiotic spore sex ratio contributes to the observed bias in genetic adult sex ratio in natural populations. Earlier attempts to study meiotic sex ratios have involved commonly cultivated ruderals that rapidly express sex in the laboratory. We established single-spore cultures from field-collected sporophytes from these populations and used the marker to assess the sex of individual sporelings. Spore germinability was (near) complete, and mortality among sporelings was virtually absent. The true meiotic sex ratio did not differ from equality, but differed strongly both from the observed genetic sex ratios in the natural adult populations, and from the European scale genetic sex ratio. We conclude that the biased population sex ratios in this species arise at life cycle stages after spore germination. Sexual dimorphism may selectively favour female proliferation during some phase of gametophyte development. Based on methodological progress, we successfully used a perennial study species with rare sexual reproduction, which significantly broadens the life history spectrum investigated in bryophyte sex ratio studies

Place, publisher, year, edition, pages
2017.
Keyword [en]
Bryophyte, Cultivation, Genetic sex ratio, Molecular sex-targeting marker
National Category
Evolutionary Biology
Research subject
Diversity of life
Identifiers
URN: urn:nbn:se:nrm:diva-1940DOI: 10.1080/03736687.2016.1264662OAI: oai:DiVA.org:nrm-1940DiVA: diva2:1050458
Available from: 2016-11-29 Created: 2016-11-29 Last updated: 2016-11-29Bibliographically approved

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Bisang, IreneHedenäs, LarsCronberg, Nils
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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
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