Huiet, Layne , Pryer, Kathleen , Haufler, Christopher , Windham, Michael .
Simplifying the complex: an integrative analysis using cytogenetics, morphology, and DNA sequence data to resolve relationships within the Pellaea wrightiana complex(Pteridaceae).
The identity and taxonomic status of Pellaea wrightiana Hooker have been sources of contention since the taxon was first described in 1858. At various times, it has been treated as a distinct species, a variety of P. ternifolia, or a synonym of P. longimucronata (= P. truncata). Chromosome analyses identify three cytotypes among populations traditionally assigned to P. wrightiana: a fertile tetraploid that spans the entire geographic range of the taxon, and two sterile cytotypes (one triploid and one tetraploid) with more limited distributions. Each cytotype is morphologically recognizable, and examination of the holotype of P. wrightiana indicates that the name properly applies to the fertile tetraploid. Newly generated plastid and nuclear DNA sequence data support the hypothesis that P. wrightiana sensu stricto arose through hybridization between P. truncata and P.ternifolia, and identify the two sterile cytotypes as backcrosses between P. wrightiana and its respective parental taxa. This study emphasizes, once again, the resolving power gained by integrating modern DNA analyses with data derived from old school biosystematics.
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1 - Duke University, Biology, Box 90338, Durham, NC, 27708, United States
2 - Duke University, Science Drive, Durham, NC, 27708-0338, USA
3 - University Of Kansas, Department Of Ecology And Evolutionary Biology, 1200 Sunnyside Avenue, Haworth Hall, Lawrence, KS, 66045-2106, USA
4 - DUKE UNIVERSITY, Department Of Biology, BOX 90338, DURHAM, NC, 27708, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Union E/Hyatt
Date: Monday, July 9th, 2012
Time: 11:00 AM