Stapay, Tara , Esselman, Elizabeth , Smith, Marian , McKenzie, Paul .
Evidence for hybridization between Schoenoplectushallii and S. saximontanus (Cyperaceae) using ISSR markers.
Schoenoplectus hallii, or Hall's bulrush, belongs to Schoenoplectus section Supini (Cherm.) J. Raynal in the family Cyperaceae. This annual species is confined to wetland habitats with variable water levels. The species is of conservation concern wherever it occurs, partially due to its vast population losses over the past 25 years. A contributing factor to its decline could be the hybridization with a closely related species, S. saximontanus.These two species differ in their ranges and chromosome numbers; however, past morphological studies suggest that hybridization is possible. This study provided molecular evidence of hybridization using inter-simple sequence repeat (ISSR) DNA markers. A total of 260 plants were examined from 17 populations across 4 states. Seven species-specific markers were found for S. saximontanus, and 4 were found for S. hallii. These markers were found in the proposed hybrids, supporting the hypothesis that hybridization is occurring. The ISSR data was also used to examine the genetic diversity within and among populations. The lowest levels of diversity were found in Missouri and Illinois, and the highest levels were found in Oklahoma where the two species co-occur. Higher diversity in plants at this site could be due to hybridization between the species. The isolated sites in the Midwest are valuable since they are hybrid free. However, poor reporting and habitat degradation due to agricultural development threatens S. hallii's continued survival. Conservation efforts are needed to preserve the extant populations.
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1 - Southern Illinois University Edwardsville, Biological Sciences, Edwardsville, IL, 62026, USA
2 - Southern Illinois University, Department Of Biology, RM 3330 SCIENCE BLDG, EDWARDSVILLE, IL, 62026-1651, USA
3 - Department Of Biological Sciences, 1222 Chancellor Drive, EDWARDSVILLE, IL, 62025, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Lindell A/Chase Park Plaza
Date: Wednesday, July 13th, 2011
Time: 1:30 PM