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Abstract Detail


Principles of crucifer evolution

Harris , James G [1], Knight, Julie [1].

Molecular phylogenetics of Braya.

Braya pilosa is a narrow endemic of the Northwest Territories of Canada. It survived the Pleistocene in a single location in eastern Beringia along the margins of the Laurentide Ice Sheet. Lost to science from 1850 until its rediscovery in 2004, DNA sequence data from B. pilosa specimens collected in 2011 are providing new insight into the role of the species in the evolution of Braya in arctic North America. Braya pilosa is closely related to - and almost certainly gave rise to - the high-arctic B. thorild-wulffii with which it shares a basal position in an ITS-based phylogeny of North American Braya species. The separation of B. thorild-wulffii from B. pilosa is correlated with floral morphological changes characteristic of the selfing syndrome and a shift from allogamy to autogamy. Braya pilosa also appears to have contributed to the allopolyploid origins of B. glabella, which is distributed in arctic and alpine regions of North America.

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1 - Utah Valley University, Department of Biology, 800 W University Pkwy, Orem, UT, 84058, USA

Keywords:
Braya
Braya pilosa
Braya thorild-wulffii
Braya glabella
Brassicaceae
Pleistocene glaciation
Beringia
selfing syndrome.

Presentation Type: Symposium or Colloquium Presentation
Session: C4
Location: Delaware C/Hyatt
Date: Tuesday, July 10th, 2012
Time: 3:45 PM
Number: C4009
Abstract ID:765


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