Abstract Detail

Systematics

Schafran, Peter [1], Zimmer, Elizabeth [2], Taylor, W. Carl [3], Musselman, Lytton [4].

Molecular phylogeny of diploid Isoetes (Isoetaceae, Lycophyta) in the southeastern United States based on low-copy nuclear markers and whole chloroplast genomes.

The systematic treatment of Isoetes L. in eastern North America afflicts taxonomists, especially with the discovery of several new taxa in the 1990s and 2000s. These elusive lycophytes have few variable morphological features to provide insight into the evolutionary history of the group. DNA sequences from multiple nuclear markers and whole chloroplast genomes provide a set of data to infer a phylogeny of the thirteen known basic diploid taxa of Isoetes in the southeastern US. Within the region several large clades are resolved, though relationships among many species are still unclear. Discordance between molecular datasets may indicate a history of introgression and incomplete lineage sorting in this young and promiscuous clade of Isoetes.

1 - Department Of Biological Sciences, Old Dominion University, Norfolk, VA, 23529-0266, USA
2 - Smithsonian Institution, National Museum of Natural History, Department of Botany, PO Box 37012, Washington, DC, 20013-7012
3 - Smithsonian Institution, Department of Botany, National Museum of Natural History, Washington, DC, 20013, USA
4 - Old Dominion University, MARY P HOGAN PROF OF BOTANY, Department Of Biological Sciences, Norfolk, VA, 23529-0266, USA

Keywords:
Isoetes
Isoetaceae
Lycophyte
phylogenomics
Systematics.

Presentation Type: Oral Paper
Session: 21, Cooley Awards I
Location: 201/Savannah International Trade and Convention Center
Date: Tuesday, August 2nd, 2016
Time: 8:30 AM
Number: 21003
Abstract ID:211
Candidate for Awards:George R. Cooley Award