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Abstract Detail


Genomics / Proteomics

Sherman-Broyles, Sue [1], Ilut, Daniel [2], Egan, Ashley N. [3], Torregrossa, Carine [4], Denny, Roxanne [4], Maroof, Saghai [5], Geffroy, Valerie [6], Roe, Bruce [7], Innes, Roger [8], Young, Nevin [4], Doyle, Jeff J. [9].

Genome Evolution In Paleopolyploid and Neopolyploid Glycine (Leguminosae).

Previous studies of cultivated soybean, Glycine max, have established it as a paleopolyploid, with a chromosome number of 2n = 40. Although both Glycine and Zea (maize) experienced polyploid events at roughly the same time (10-15 mya), their patterns of genome evolution appear to be quite different. The maize genome shows evidence of many rearrangements and deletions, mostly the result of transposable element activity. Previous reports indicate that Glycine retains genes and synteny in homoeologues from the ca. 15 my paleopolyploid event. Gene retention in the previously investigated soybean region supported hypotheses that certain classes of genes may be preferentially retained. Here we report results of an investigation of homologous regions from three soybean taxa which allow us to examine genome evolution at several timescales. In soybean, a 500 kb region rich in resistance(R)-genes has a homoeologue that has experienced gene loss and has expanded due to extensive transposable element insertion. In addition to G. max, we also have sequence from homologous regions of G. tomentella, a perennial wild relative of G. max. The tomentella complex is composed of several cryptic species that, like soybean, are "diploid" (2n = 40) and several taxa that are neopolyploids (2n = 80). The tomentella complex diverged from the soybean lineage 5-10 mya, while the neopolyploid event occurred much more recently,(< 50,000 years before present). Like soybean, the diploid G. tomentella accession has one paleohomoeologue that is gene rich and one that has experienced gene loss and transposable element insertion. We compare the two neohomoeologues of the gene-rich paleohomoeologue in 2n = 80 G. tomentella to test the hypothesis that significant evolutionary changes such as insertion of transposable elements are an early consequence of polyploidy, as has been shown in many synthetic polyploids. http://www.bio.indiana.edu/~nsflegume/index.php


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Comparative Analysis of Legume Genome Evolution


1 - Cornell University, Plant Biology, 228 Plant Sciences, Ithaca, NY, 14853, USA
2 - Cornell University, L.H. Bailey Hortorium, Department of Plant Biology, Ithaca, New York, 14853, USA
3 - Cornell University, L. H. Bailey Hortorium, Dept. of Plant Biology, 228 Plant Science, Ithaca, NY, 14853, United States
4 - University of Minnesota, Department of Plant Pathology, St. Paul, MN, 55108, USA
5 - Virginia Tech, Department: Crop & Soil Environmental Science, Virginia Polytechnic Institute, Blacksburg, VA, 24601, USA
6 - Institute of Agricultural Research, Institut de Biotechnologie des Plantes, Université Paris Sud, Paris, France
7 - University of Oklahoma, Stephenson Research and Technology Center, Norman, OK, 73019, USA
8 - Indiana University, Biology (USA)
9 - Cornell University, L.H. Bailey Hortorium and Department of Plant Biology, 228 Plant Science Building, Ithaca, New York, 14853, USA

Keywords:
Soybean
genome evolution
polyploid.

Presentation Type: Oral Paper:Papers for Topics
Session: CP59
Location: Boulevard A/Hilton
Date: Wednesday, July 11th, 2007
Time: 4:15 PM
Number: CP59005
Abstract ID:1983


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