Roche, Morgan , Jordon-Thaden, Ingrid , MARTINE , CHRISTOPHER T .
When dioecy doesn’t pay: Population genetic comparisons across three breeding systems and five species in Australia Solanum.
Inbreeding avoidance via obligate outcrossing is among the more common explanations for why dioecy has arisen in so many lineages of Angiosperms. The ca. 15 dioecious species of Solanum in northern Australia represent a useful model for examining the potential genetic benefits of dioecy because a) Populations are often small and isolated from other conspecific populations, b) Populations are sympatric with andromonoecious (and potentially self-fertilizing) congeners, and c) Dioecy appears to be a recently-derived condition evidenced by retention of vestigial and/or non-functional reproductive organs. This study employs Genotyping by Sequencing (GBS) with double digestion followed by Illumina sequencing, to compare genetic variation within and among regionally sympatric populations of three dioecious species: S. sejunctum, S. asymmetriphyllum, and S. cowiei; a hermaphroditic species: S. echinatum; and an andromonecious species: S. clarkiae. For this study 20 populations of approximately 400 individuals were analyzed. Two categories of outcomes are explored: 1) Where dioecious species are shown to have high intra- and meta-population genetic variability relative to self-fertilizing species, dioecy may represent an effective mechanism for avoiding inbreeding and maintaining genetic diversity; and 2) Where dioecious species show reduced genetic variability, low-density population structure and isolation of populations may be limiting gene migration, thus negating some of the potential benefits of the dioecious habit.
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1 - Bucknell University, Biology C/o C. Martine, 1 Dent Drive, Lewisburg, PA, 17837, USA
2 - Bucknell University, Biology, 1 Dent Drive, Lewisburg, PA, 17837, USA
3 - Bucknell University, Biological Sciences, 203 Biology Building, Lewisburg, PA, 17837, USA
Genotyping by Sequencing
Presentation Type: Poster:Posters for Sections
Location: Eyrie/Boise Centre
Date: Monday, July 28th, 2014
Time: 5:30 PM
Candidate for Awards:Genetics Section Poster Award