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Abstract Detail


The Evolution of Ericales: Recent Insights using both Morphology and Molecules

Johnson, Leigh A. [1], Ferguson, Carolyn [2], Patterson, Robert [3], Porter, J. Mark [4], Prather, L. Alan [5], Wilken, Dieter [6].

From its roots to its shoots: insights into diversification patterns and processes in the phlox family (Polemoniaceae).

A decade of molecular work has firmly established the ericalean affinities of Polemoniaceae, agreeing with Werham’s century-old suggestion for the origins for this family and his hypothesis that similarity to solanalean families is the product of convergence. Within Polemoniaceae, molecular data have likewise established several well-supported clades that serve as the basis for a tribal and sub-family level classification. This taxonomic framework is being actively used to resolve outstanding questions that remain in understanding diversification patterns and processes in the phlox family. At the deepest levels, Acanthogilia occupies a pivotal position with respect to the root of Polemoniaceae, but its sister- relationship to the entire family, or either of the two principal subfamilies, remains obscure. Sister relationships among tribes of Polemonioideae are similarly obscure, as are sister relationships among some genera within tribes. Efforts to resolve these relationships have revealed reticulate relationships among some genera, whereas only evidence of divergent relationships presently exists among other genera where reticulate origins previously have been hypothesized. Within genera and species, Polemoniaceae continues to serve as a model group for understanding speciation processes, including hybridization, polyploidy, character lability, and pollinator-relations; examples of current activities from our respective labs are here highlighted.


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1 - Brigham Young University, Department of Integrative Biology, 401 Widtsoe Building, Provo, Utah, 84602, USA
2 - Kansas State University, Herbarium and Division of Biology, Ackert Hall, Manhattan, Kansas, 66506-4901, USA
3 - San Francisco State University, Department of Biology, 1600 Holloway Avenue, San Francisco, California, 94132
4 - Rancho Santa Ana Botanic Garden, 1500 North College Avenue, Claremont, California, 91711, USA
5 - Michigan State University, Department of Plant Biology, Herbarium, 166 Plant Biology Wilson Road, East Lansing, Michigan, 48824-1312, USA
6 - Santa Barbara Botanic Garden, 1212 Mission Canyon Road, Santa Barbara, California, 93105-2199, USA

Keywords:
Polemoniaceae
Phylogenetics
Systematics
character evolution
speciation.

Presentation Type: Symposium or Colloquium Presentation
Session: 13-3
Location: 201/Ayres
Date: Monday, July 31st, 2006
Time: 11:15 AM
Abstract ID:392


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