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Abstract Detail



Systematics Section/ASPT

Martino, Maria [1], Beck, James [1].

Are cytotypes non-randomly distributed in the giant goldenrod (Solidago gigantea Ait.)?

Autopolyploidy is an under-recognized evolutionary phenomenon in angiosperms, creating cryptic patterns of reproductive isolation and phenotypic divergence within a single species. There is abundant evidence that autopolyploid cytotypes can exhibit different phenotypes, which could lead to subtle niche differentiation among these elements. In this way a species comprising an autopolyploid series could exhibit a large geographic distribution due to the collective ranges of its cytotypes. We aim to test this hypothesis in Solidago gigantea (Ait) an abundant goldenrod species, found throughout much of eastern North America. Diploid, tetraploid, and hexaploid cytotypes are known in this species, and previous studies suggest that they are non-randomly distributed across the total species' range. We will rigorously sample S. gigantea's expansive range by extracting DNA from ca. 500 herbarium specimens from all portions of the range, and to date 280 such samples from 35 states have been obtained. Allelic variation at 11 microsatellite loci will be used to estimate cytotype based on a maximum allele number approach, and distribution models for each cytotype will be constructed and compared. Our preliminary data suggest that cytotypes are indeed non-randomly distributed, with diploids found primarily in the southern and eastern portions of the range, and hexaploids largely confined to the Great Plains.


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1 - Wichita State University, Biological Sciences, 1845 Fairmount, Wichita, KS, 67260, USA

Keywords:
Solidago
Asteraceae
autopolyploidy
microsatellite
North America.

Presentation Type: Oral Paper:Papers for Sections
Session: 60
Location: Salon 2/The Shaw Conference Centre
Date: Wednesday, July 29th, 2015
Time: 9:30 AM
Number: 60007
Abstract ID:521
Candidate for Awards:None


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