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Abstract Detail



Population Genetics

Jordon-Thaden, Ingrid [1], Hayes, Daniel [2], Boni, Alexandra [3], Roche, Morgan [2], Stoughton, Thomas [4], Martine, Chris [1].

Population genetics of an alpine, polyploid, apomict, Draba oligosperma Hook. (Brassicaceae).

The present study investigates Draba oligosperma Hook., few-seeded draba, an octaploid species with an unusual distribution from alpine Alaska to Arizona, and Wyoming to California. We are examining the role of apomixis in the speciation of polyploids. Preliminary results indicate that D. oligosperma may be an allopolyploid due to taxa placement in previous ITS/trnL-F phylogentics of the genus. Preliminary flow cytometric seed screen and greenhouse data also show it is an apomictic species. We aim to infer whether this species arose via allopolyploid formation and whether such an event has happened once or multiple times creating different lineages. We also explore the possibility of the occurrence of occasional sexuality in its distribution. We are using the population genomic method of ddRADtag to investigate this system. Twenty-nine populations from its entire distribution and 10 to 15 individuals per population were included in the dataset. In conjunction an improved phylogenetic study of North American Draba sp. that is underway. We will attempt to identify the parents of D. oligosperma.


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1 - Bucknell University, Biological Sciences, 203 Biology Building, Lewisburg, PA, 17837, USA, 570/577-1135
2 - Bucknell University, Biology C/o C. Martine, 1 Dent Drive, Lewisburg, PA, 17837, USA
3 - Bucknell University, Biology Dept, Biology Bldg 203, Lewisburg, PA, 17837, USA
4 - Rancho Santa Ana Botanical Garden, 1500 N. College Avenue, Claremont, CA, 91711, USA

Keywords:
Brassicaceae
Draba
population genetics
ddRADtag
apomixis
North America
Flow Cytometry Seed Screen (FCSS).

Presentation Type: Oral Paper:Papers for Topics
Session: 71
Location: Salon 6/The Shaw Conference Centre
Date: Wednesday, July 29th, 2015
Time: 2:00 PM
Number: 71003
Abstract ID:691
Candidate for Awards:None


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