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Abstract Detail


Genetics Section

Tate, Jennifer A. [1], Bigger, Alexandra R. [2], Soltis, Kerry A. [2], Soltis, Pamela S. [3], Soltis, Douglas E. [4].

When the honeymoon ends: the fate of duplicated genes in allotetraploid Tragopogon miscellus (Asteraceae).

The genomic implications of multiple origins of polyploidy are not well known. In the case of allopolyploidy, how do the two genomes react once in a common nucleus? Are the outcomes the same for each polyploidization event? We are examining the fate of genes duplicated by polyploidy in independently-formed natural populations and synthetic individuals of Tragopogon miscellus (Asteraceae). This species has formed recurrently from two introduced diploid species in the Palouse region of Washington and Idaho during the last century. More often, T. pratensis is the maternal progenitor and T. dubius is the paternal progenitor; individuals resulting from this cross have short ligules. One extant population of T. miscellus has T. dubius as its maternal progenitor and these individuals have long ligules. Genomic and cDNA-CAPS analyses of individuals from two reciprocally formed populations reveal that homeolog loss is random among individuals within both populations, but loss of the T. dubius copy occurs more frequently than T. pratensis. F1 hybrids are additive of their parental genomes, suggesting that polyploidization or other processes (i.e., recombination) are responsible for such loss. Examination of four additional short-liguled populations of T. miscellus shows that loss of parental homeologs occurs for some of the same loci and again the T. dubius copy is typically lost. The recent creation of synthetic polyploids allows us to determine at what stage in polyploid evolution these losses occur and creates additional opportunities to investigate the earliest stages of polyploid genome evolution.


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1 - Massey University, Institute of Molecular BioSciences, Private Bag 11222, Science Tower D, Riddet Road, Palmerston North, New Zealand
2 - University of Florida, Department of Botany, PO Box 118526, Gainesville, Florida, 32611, U.S.A.
3 - University of Florida, Department of Botany, Florida Museum of Natural History, P.O. Box 117800, Gainesville, Florida, 32611-7800, USA
4 - University of Florida, Department of Botany, 220 Bartram Hall, P.O. Box 118526, Gainesville, Florida, 32611-8526, USA

Keywords:
polyploidy
Tragopogon
Asteraceae
genome evolution.

Presentation Type: Oral Paper:Papers for Sections
Session: CP14
Location: Lake Huron/Hilton
Date: Monday, July 9th, 2007
Time: 1:00 PM
Number: CP14001
Abstract ID:1042


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