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Abstract Detail


Colloquium: Assembling the Tree of Life Colloquium

Kinney, Michael S. [1], Wheeler, Erica J [1], Hertweck, Kate L. [1], Chase, Mark W. [2], Pires, J. Chris [1].

Phylogeny and chromosome evolution in the Asparagales.

The monocot order Asparagales are an economically important group that includes onions (Allium), Asparagus, Agave and ornamental plants such as orchids, daffodils, and irises. The core Asparagales is composed of two well-supported clades, Alliaceae s.l. (Agapanthaceae, Alliaceae s.s., Amaryllidaceae) and Asparagaceae s.l. (Agavaceae, Aphyllanthaceae, Asparagaceae s.s. Hyacinthaceae, Laxmanniaceae, Ruscaceae, and Themidaceae). Questions remain about the evolutionary origin, patterns of morphological divergence, geographic diversification, and ecological radiation of this group. Current phylogenetic studies based on six plastid and one mitochondrial gene region leave relationships among some families poorly supported at several nodes. In an effort to resolve these relationships, we sequenced the low-copy nuclear gene PHYTOCHROME C (PHYC) and plastid genomes (more than 80 genes) across taxa representing all ten core Asparagales families and outgroups. We conducted independent phylogenetic analyses of these regions and combined these new data with data from previous studies. Our combined phylogenetic analyses may potentially resolve evolutionary relationships to help interpret patterns of morphological diversification and biogeographical distribution among core Asparagales clades. In addition, the Asparagales have a wide range of chromosome numbers (2n = 4228, a 57-fold difference), and genome sizes (0.4875.9 pg, a 158-fold difference), and we are now identifying and developing several rapid cycling, small genome size taxa in the Asparagales to serve as genomic models. This effort will be discussed in light of next generation sequencing technologies, molecular cytogenetics, and the recently funded Monocot Tree of Life project.


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1 - University of Missouri, Biological Sciences, 311 Bond Life Sciences Center, 1201 Rollins Street , Columbia, MO, 65211-7310, USA
2 - Royal Botanic Gardens, Kew, Jodrell Laboratories, Richmond, Surrey, TW9 3DS, United Kingdom

Keywords:
Asparagus
cytogenetics
PHYTOCHROME C
phylogenomics
polyploidy.

Presentation Type: Symposium or Colloquium Presentation
Session: C1
Location: Cottonwood C/Snowbird Center
Date: Tuesday, July 28th, 2009
Time: 2:15 PM
Number: C1006
Abstract ID:748


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