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Abstract Detail


Hayes, Daniel [1], Cantley, Jason [1], Martine, Christopher [2].

Ex situ interspecies crossing rates infer importance of geographic barriers in speciation among closely related Solanum species of the Australian Monsoon Tropics.

The 20+ taxa of the Solanum subgenus Leptostemonum “Dioicum Group” sensu Bean of northwest Australia are either andromonoecious or dioecious and closely allied with a group of hermaphrodite taxa – providing one of the few examples in which these three breeding systems are present in the same group. Phylogenetic analysis has defined five distinct clades outlining breeding system evolution and answering questions on the origins of diocey within the group. These ‘spiny solanums’ populate a large portion of the Australian Monsoon Tropics (AMT), with many of the taxa split between two subregions of far northern Western Australia and the “Top End” of the Northern Territory. Population genetics work hints at the notion that these closely related Australian Solanum spp. are isolated because of geographic distance. The distribution of these taxa across the AMT supports geographic isolation as a key factor in the origins of these species and raises questions related to reproductive barriers across species and clades since hybrids can be artificially created in a greenhouse. The current study assesses the potential role of isolating mechanisms in speciation through a controlled crossing experiment encompassing sixteen species distributed across four clades and two breeding systems (dioecy and andromonoecy). The results of this study will provide valuable information on the reproductive isolation, or lack thereof, among the taxa. Findings from this study will complement and inform population genetics analyses and be used to help infer divergence times among the study taxa.

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1 - Bucknell University, Bucknell University, Biology Department, 1 Dent Drive, Lewisburg, PA, 17837, United States
2 - Bucknell University, Biological Sciences, 203 Biology Building, Lewisburg, PA, 17837, United States

undergraduate research
Reproductive isolation
Isolating mechanism

Presentation Type: Poster
Session: P, Ecology
Location: Exhibit Hall/Omni Hotel
Date: Monday, June 26th, 2017
Time: 5:30 PM This poster will be presented at 5:30 pm. The Poster Session runs from 5:30 pm to 7:00 pm. Posters with odd poster numbers are presented at 5:30 pm, and posters with even poster numbers are presented at 6:15 pm.
Number: PEC011
Abstract ID:274
Candidate for Awards:Ecological Section Best Undergraduate Presentation Award

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