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Abstract Detail



Biogeography

Call, Christtina [1], Allphin, Loreen [1], Windham, Michael [2], Beck, James [3], Li, Fay-Wei [2], Alexander, Patrick [4], Bailey, C. Donovan [5], Al-Shehbaz, Ihsan [6].

Ecological and genetic diversity across two divergent species of Boechera (Brassicaceae) in biogeographic space.

Over the relatively short period of its existence, the genus Boechera (Brasssicaceae) has undergone rapid radiation that has produced 70 + morphologically distinct, sexual diploids. However, reproductive isolation has not kept pace with morphological divergence in this group and the diploids appear to hybridize whenever they come into contact. These hybridization events have given rise to a diverse array of apomictic diploids, apomictic triploids and tetraploids. We have developed a 15-locus microsatellite (SSR) data set that allows us to determine the genomic make-up, ploidy level and reproductive mode of nearly any Boechera specimen collected within the last 150 years. We used these microsatellite data from 15 variable loci, ecological data and ArcGIS to characterize genetic and geospatial differences and similarities between two divergent sexual diploids in the genus, Boechera thompsonii and Boechera formosa. We compared the distribution of allelic diversity, heterozygosity, apomixis, and interactions with other Boechera taxa in biogeographic space. We found interesting geographic patterns associated with heterozygosity and allelic diversity in both taxa. Boechera formosa exhibits lower heterozygosity and allelic diversity than Boechera thompsonii which is more genetically diverse and geographically widespread. However, allelic diversity and heterozygosity are not distributed randomly across each species' range. For example, the greatest allelic diversity and heterozygosity is located in the western part of the biogeographic range of B. formosa. In addition, the distribution of certain genotypes in biogeographic space contributes to hybridization and interactions with other taxa in Boechera.

Broader Impacts:


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1 - Brigham Young University, Department of Plant and Wildlife Science, 275 Widtsoe Building, Provo, UT, 84602, USA
2 - Duke University, Department of Biology, Box 90338, Durham, NC, 27708, USA
3 - Wichita State University, Biology, 1845 Fairmount, Box 26, Wichita, KS, 67260-0026, USA
4 - New Mexico State University, Biology Department, 248 Foster Hall, MSC 3AF, Las Cruces, NM, 88003, USA
5 - New Mexico State University, Biology, PO Box 30001 Msc 3AF, Las Cruces, NM, 88003, USA
6 - Missouri Botanical Garden, P. O. Box 299, St. Louis, MO, 63166-0299, USA

Keywords:
Boechera
heterozygosity
biogeography
apomixis
Brassicaceae.

Presentation Type: Oral Paper:Papers for Topics
Session: 50
Location: Magnolia/Riverside Hilton
Date: Wednesday, July 31st, 2013
Time: 2:45 PM
Number: 50006
Abstract ID:944
Candidate for Awards:George R. Cooley Award


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