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Abstract Detail

Systematics Section/ASPT

Waselkov, Katherine [1], Wright, Bethany [1], Fehlberg , Shannon D [2], Mayfield, Mark H. [1], Ferguson, Carolyn J [1].

Perplexing polyploidy in the Polemoniaceae: patterns in Phlox phylogenies.

Phlox, the largest genus among Polemoniaceae, exhibits intriguing diversity among its ca. 60 mostly North American species. Of particular interest are patterns of variation in ploidy level among and within species. Here we discuss general patterns of congruence and incongruence between ITS and cpDNA phylogenies based on comprehensive sampling of Phlox taxa. Incorporating ploidy level information for samples, we demonstrate that phylogenies that exclude polyploid samples show better agreement. These diploid sample phylogenies are discussed in light of current taxonomy, highlighting placement of taxonomic groups of interest, including the upright eastern taxa, western edaphic endemics, upright southwestern taxa, eastern mat-forming taxa, annuals, and diploid members of the P. hoodii and P. longifolia complexes. We further present available phylogenetic data for several low copy regions, which improve resolution of relationships for the genus. Several examples of diploid and polyploid taxa are highlighted and considered in the context of all data sets. We discuss challenges to reconstructing relationships for groups with extensive polyploidy, as well as some strategies for obtaining sufficient sequence data in light of potential allelic variation. This study provides an improved phylogenetic framework for Phlox, advancing it as an excellent system for investigating aspects of diversity relative to polyploidy.

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1 - Kansas State University, Division of Biology, Ackert Hall, Manhattan, KS, 66506-4901, USA
2 - Desert Botanical Garden, 1201 N. Galvin Pkwy., Phoenix, AZ, 85008, USA

phylogenetic incongruence.

Presentation Type: Oral Paper:Papers for Sections
Session: 17
Location: Payette/Boise Centre
Date: Tuesday, July 29th, 2014
Time: 11:00 AM
Number: 17012
Abstract ID:632
Candidate for Awards:George R. Cooley Award

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