Understanding plant evolution: morphology to molecules
Little, Damon , Deutsch, Joan , Dutton, Ashley , Margheim, Stephanie , Peery, Rhiannon , Raubeson, Linda A. , Stevenson, Dennis Wm. .
Cycads in the gymnosperm tree of life.
Cycads represent approximately one–third of extant gymnosperm diversity. Although cycads are clearly monophyletic, relationships amongst the eleven cycad genera are still poorly understood—this despite decades of systematic work and numerous published analyses of morphological and molecular variation. As part of the Gymnosperm AToL we attempting to reconstruct the species level phylogeny for all extant cycads using data from all three genomic compartments and morphology. To date, we have sampled 85% of the known species for five loci (matK, nad1 intron, nrITS, NEEDLY, and LEAFY). With the exception of Zamia all genera were resolved as monophyletic—Chigua was nested within Zamia. Within genera, the amount of molecular variation was insufficient to consistently resolve the phylogeny—data from additional loci are being generated. Strongly supported clades that are consistently resolved amongst the datasets include: (1) Cycas sister the remaining extant cycads; (2) an Africa/Australia clade of Encephalartos, Lepidozamia, and Macrozamia (Encephalartos and Lepidozamia are sister); and (3) a New World clade of Chigua, Microcycas, and Zamia.
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1 - The New York Botanical Garden, Lewis B. and Dorothy Cullman Program for Molecular Systematic Studies, 200th St. & Southern Blvd., Bronx, New York, 10458-5126, USA
2 - The New York Botanical Garden, Lewis B. and Dorothy Cullman Program for Molecular Systematics Studies, 200th St. & Southern Blvd., Bronx, New York, 10458-5126, USA
3 - Central Washington University, Department of Biological Sciences, 400 E University Way, Ellensburg, WA, 98926-7537, USA
4 - New York Botanical Garden, Institute of Systematic Botany, 200Th Street & Southern Boulevard, Bronx, New York, 10458-5126, USA
Presentation Type: Symposium or Colloquium Presentation
Location: Room 4/Woodward
Date: Monday, July 28th, 2008
Time: 4:15 PM