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Abstract Detail



Ecological Section

Gilman, Ian [1], Jordon-Thaden, Ingrid [2], MARTINE , CHRISTOPHER T [3].

Vague species boundaries exposed: Reproductive biology of functionally dioecious sister taxa in Australian Solanum .

Solanum asymmetriphyllum and S. sejunctum are functionally dioecious spiny solanums endemic to sandstone formations along the western escarpment of the Arnhem Plateau (Northern Territory, Australia).  The species are regionally sympatric but do not overlap in space, with S. sejunctum mostly occupying a restricted range consisting of a single monolith. While the reproductive biology of S. asymmetriphyllum has been analyzed, with the species described as functionally dioecious based on pollen characters and crossing experiments, S. sejunctum has not previously been closely examined. Data garnered from procedures involving hundreds of greenhouse plants are here presented, along with comparisons between S. sejunctum. S. asymmetriphyllum, and other functionally dioecious solanums. Surprisingly, interspecific crosses performed between S. sejunctum and S. asymmetriphyllum led to nearly 100% fruit set.  Measures of seed set and seed germination, plus the collection of an intermediate form in the wild, infer a recent divergence. 


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1 - Bucknell University, Dept Biology, Biology Bldg 203, 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

Keywords:
Solanum
Australia
hybridization
Plant reproduction
species delimitation
dioecy
Solanaceae
Undergraduate.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Eyrie/Boise Centre
Date: Monday, July 28th, 2014
Time: 5:30 PM
Number: PEC033
Abstract ID:226
Candidate for Awards:Ecological Section Best Undergraduate Presentation Award


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