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Abstract Detail

Annonaceae evolution: integrating molecules, biogeography and ecology

Neubig , Kurt Maximillian [1], Abbott, J. Richard [2].

A phylogeny of the pawpaws (Asimina and Deeringothamnus; Annonaceae) is indicative of introgression based on plastid DNA data.

The pawpaws are a group of 10 species in the genera Asimina and Deeringothamnus (Annonaceae).  This study confirms the sister relationship of the pawpaws to DisepalumDeeringothamnus is phylogenetically embedded within Asimina, and thus best treated as part of a single genus, Asimina s.l.  However, some species of Asimina are not monophyletic according to these plastid data, most likely due to plastid capture through hybridization.  Natural hybridization has been reported between many species pairs, but is relatively rare in the landscape.  Based on the phylogenetic structure, some hybridization and plastid capture is suspected to be historical as well as ongoing.  Many species are morphologically cohesive and distinctive, yet do not necessarily show monophyly in the plastid phylogeny.  Asimina s.l. likely represents an old lineage with most modern species being the result of relatively recent radiation into xeric habitats in Florida, possibly in response to glacial episodes and associated fluctuations in sea level.

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1 - University of Florida, Florida Museum of Natural History, 385 Dickinson Hall, Gainesville, FL, 32611-7800, USA
2 - Missouri Botanical Garden, P O Box 299, St Louis, MO, 63166-0299, USA

plastid capture.

Presentation Type: Symposium or Colloquium Presentation
Session: SY04
Location: Pines South/Boise Centre
Date: Tuesday, July 29th, 2014
Time: 8:30 AM
Number: SY04002
Abstract ID:401
Candidate for Awards:None

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