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Abstract Detail


Systematics Section/ASPT

Estep, Matt [1], Vela Diaz, Dilys [2], Zhong, Jinshun [3], Kellogg, Elizabeth [4].

Phylogeny, Polyploidy and Genome Evolution in the Andropogoneae.

The tribe Andropogoneae (sub-family Panicoideae, family Poaceae) is amorphologically diverse clade of grasses that contains some of our most economically important species (maize (Zea), Sorghum, and sugarcane(Saccharum)). The tribe also contains ecologically important species in temperate and tropical grasslands (e.g., Andropogon gerardii, Schizachyriumscoparium, and Sorghastrum nutans of the North American tallgrass prairie), some of the most troublesome agricultural weeds (Imperata cylindrica,Sorghum halepense), many important forage crops (Dichanthium spp., Bothriochloa spp., Andropogon spp.) and some burgeoning biofuels (Miscanthus and Saccharum).Generic relationships among the 90 genera in the tribe are currently unresolved. Previous work has suggested a rapid radiation within the tribe and many examples of hybridization are known. A new set of nuclear loci have been sequenced for 160 taxa from 59 genera. Individual gene trees were concatenated,providing greater resolution within the tribe than previously published work. These markers allow us to identify/verify allopolyploid taxa or clades and the ability to identify theirlikely parental donors. The polyploid clades identified within the tribe include Zea/Tripsacum (of tetraploid origin), the Bothriochloa/Capillipedium/Dichanthium complex, the Andropogon/Hyparrhenia/Schizachyrium complex and the Saccharum/Miscanthus complex. This unique opportunity of identifying four independent polyploid clades within amonophyletic group allows us to investigate the influence of polyploidy in new detail. Chromosome number and genome size for most taxa are being mapped on the phylogeny to explore the evolution of genome size.

Broader Impacts:


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1 - University Of Missouri-St. Louis, Department Of Biology, R223 Research Building, St. Louis, MO, 63121, USA
2 - University Of Missouri - St. Louis, Department Biology. 223 Research Building, One University Blvd., Saint Louis, MO, 63121-4499, USA
3 - Department Of Biology, Research BLDG 223, One University Blvd, Saint Louis, MO, 63121, USA
4 - University Of Missouri - St. Louis, Department Of Biology, One University Boulevard, St. Louis, MO, 63121-4499, USA

Keywords:
Andropogoneae
Polyploidy.

Presentation Type: Oral Paper:Papers for Sections
Session: 15
Location: Franklin B/Hyatt
Date: Monday, July 9th, 2012
Time: 4:30 PM
Number: 15012
Abstract ID:543


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