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Abstract Detail

Systematics Section/ASPT

Goodrich, Katherine [1], Raguso, Robert Andrew [2].

Floral phenotypes of Asimina triloba, Asimina parviflora, and putative natural hybrids.

Plant hybrid zones are ideal study sites for questions regarding plant speciation, gene flow (or barriers to gene flow), reproductive character displacement, and potential outcomes of anthropogenic reintroduction for recently diverged taxa. Different kinds of hybrids are encountered in natural settings. Hybrid swarms include rampant phenotypic variation reflecting back crossing to parental taxa or independent trait assortment in generations beyond the F1. In contrast, plants whose phenotypes are intermediate between but distinct from those of putative parents are more likely to represent sterile (or long lived, vegetatively propagated) F1 hybrids. We are interested in patterns of hybridization and floral trait inheritance in the early Angiosperm genus Asimina (Annonaceae) in North America. Phylogenetic resolution of the genus based on traditional molecular markers is minimal, possibly due to historical introgression. Natural putative hybrids (based on intermediate floral and vegetative phenotype) are occasionally observed between Asimina species which overlap geographically. Here we present floral phenotype data (floral scent, morphology and color) for putative A. triloba X A. parviflora natural populations in SC and GA, with corresponding floral phenotype data from putative parent populations at each location. We use multivariate descriptive statistics to identify several factors and associated floral trait variables which explain a significant portion of character state variation between species and putative hybrid populations. Our data show a consistent intermediate floral phenotype for putative hybrid individuals in geographically separate hybrid populations, and this phenotype is discrete from either parental phenotype. Understanding patterns of floral trait inheritance in Asimina will provide a framework for future studies of gene flow and species boundaries in natural Asimina populations which increasingly overlap due to habitat loss and disturbance. Furthermore, this work adds to the increasing understanding of floral phenotype variation and speciation of early Angiosperms.

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1 - Widener University, Department of Biology, Kirkbride Hall, 1 University Place, Chester, PA, 19050, USA
2 - Cornell University, Neurobiology and Behavior, W355 Mudd Hall, 215 Tower Road, Ithaca, NY, 14853, USA

Floral scent
Floral form and size.

Presentation Type: Oral Paper:Papers for Sections
Session: 49
Location: Salon 4/The Shaw Conference Centre
Date: Tuesday, July 28th, 2015
Time: 4:00 PM
Number: 49010
Abstract ID:873
Candidate for Awards:None

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