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Abstract Detail



Systematics Section/ASPT

Tippery, Nicholas [1].

Low-copy nuclear genes support allopolyploid diversification in Nymphoides (Menyanthaceae).

The cosmopolitan aquatic genus Nymphoides (floating-heart) presents many opportunities for systematic study, comprising species with a variety of inflorescence architectures, floral morphologies, and reproductive systems. Previous phylogenetic study of the genus using molecular (DNA) data revealed extensive incongruity between nuclear (ITS) and plastid (matK/trnK, rbcL) loci. I attempt to reconcile the incongruity by incorporating sequence data from the nuclear genes phytoene desaturase (PDS) and transmembrane nine (TMN1), as well as additional data from the plastid trnT-trnF spacer region. A complete data set for all gene markers was obtained for approximately half of all Nymphoides species worldwide. Polymorphic PDS and TMN1 sequence data were obtained for several species, which thereby were interpreted to be allopolyploids. Consistent results between the two loci increased the confidence with which polyploids could be assigned to ancestral parent lineages. The Nymphoides phylogeny derived from these nuclear and plastid sequence data represents the most comprehensive systematic understanding of the genus to date, providing greater confidence in species relationships and enabling new insights into character evolution.


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1 - University Of Wisconsin - Whitewater, Department Of Biological Sciences, 800 W Main St, 800 W Main St, Whitewater, WI, 53190, USA

Keywords:
Aquatic plants
Asterales
hybridization
Phylogenetics
Polyploidy.

Presentation Type: Oral Paper:Papers for Sections
Session: 60
Location: Salon 2/The Shaw Conference Centre
Date: Wednesday, July 29th, 2015
Time: 10:45 AM
Number: 60011
Abstract ID:796
Candidate for Awards:None


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