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Abstract Detail

Pteridological Section/AFS

Farrar, Donald R. [1], Stensvold, Mary C. [2], Dauphin, Benjamin [3].

Differentiation through genome partitioning and intragametophytic selfing.

The Botrychium lunaria clade includes six diploid taxa distributed in cool temperate climates of the northern hemisphere. Taxa are differentiated by morphology, range and habitat, and by unique genetic profiles. Each is characterized by exceptionally low genetic variability, presumably due to reliance on intragametophytic selfing, as reported by all published genetic analyses of Botrychium and other Ophioglossaceae with bisexual underground gametophytes. The opposite of this pattern, outbreeding and high genetic diversity, exists in newly discovered populations of B. lunaria in the Swiss Alps. As these populations include nearly all of the alleles characterizing the B. lunaria clade, it appears to represent the probable ancestral condition from which all taxa of the clade have been derived. Mechanisms for this diversification suggest a previously underappreciated role of intragametophytic selfing.

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1 - Iowa State University, Ecology, Evolution and Organismal Biology, 251 Bessey Hall, Ames, IA, 50011, USA
2 - USDA Forest Service, Alaska Region, 204 Siganaka Way, Sitka, AK, 99835, USA
3 - Université de Neuchâtel, Laboratoire de botanique evolutive, Institut de biologie, Rue Émile-Argand 11 , CH-2009, Neuchâtel, Switzerland

taxon differentiation
intragametophytic selfing.

Presentation Type: Oral Paper:Papers for Sections
Session: 10
Location: Salon 20/The Shaw Conference Centre
Date: Monday, July 27th, 2015
Time: 10:45 AM
Number: 10003
Abstract ID:349
Candidate for Awards:None

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