Systematics Section / ASPT
Archibald, Jenny K. , Anderson, Bruce .
The utility of inter-simple sequence repeat (ISSR) data for resolving phylogenetic relationships and inferring gene flow among populations of Zaluzianskya microsiphon and allied species in section Nycterinia.
Zaluzianskya (Scrophulariaceae s.s.) is a genus of approximately 55 species that are endemic to southern Africa. The genus encompasses a high level of diversity including variation in life history traits, habitat preferences, and floral forms. Examples of the latter include the presence of both night- and day-flowering species with corolla tube lengths that range from 4 to 60 mm. Sequence data has resolved three major clades within Zaluzianskya, including one clade containing all sampled members of the 20 species in section Nycterinia. However, phylogenetic relationships within this section remained weakly supported and incompletely resolved. The utility of inter-simple sequence repeat (ISSR) markers within section Nycterinia was explored and compared with phylogenies based on nuclear and chloroplast DNA-sequence data. In addition, a number of populations of the morphologically distinctive and variable Z. microsiphon are being investigated to infer patterns of gene flow. Although sequence data may be preferable for inferring phylogenetic relationships among larger clades of species within this genus, phylogenetic signal does appear to be present within the ISSR data and may show particular utility among closely-related species and populations.
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1 - University of Kansas, Department of Ecology and Evolutionary Biology and the Natural History Museum and Biodiversity Research Center, 1200 Sunnyside Avenue, Lawrence, Kansas, 66045, USA
2 - University of Stellenbosch, Department of Botany & Zoology, Private Bag X1, Matieland, 7602, South Africa
Presentation Type: Oral Paper:Papers for Sections
Location: Stevens 2/Hilton
Date: Tuesday, July 10th, 2007
Time: 9:30 AM