help button home button Genetics J Cell Biol
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH
Genetics. Published Articles Ahead of Print: January 16, 2005, Copyright © 2005
doi:10.1534/genetics.104.032839

A more recent version of this article appeared on February 1, 2005.
This Article
Right arrow Full Text (Rapid PDF)
Right arrow Supplemental Material
Right arrow All Versions of this Article:
genetics.104.032839v1
169/2/931    most recent
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow Author home page(s):
Ales Kovarik
Andrew Rowand Leitch
Kar Yoong Lim
Roman Matyasek
Jennifer Rocca
Douglas Soltis
Pamela Soltis
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Kovarik, A.
Right arrow Articles by Soltis, P.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Kovarik, A.
Right arrow Articles by Soltis, P.

REGULAR RESEARCH PAPERS

Rapid Concerted Eevolution of Nuclear Ribosomal DNA in two Tragopogon Allopolyploids of Recent and Recurrent Origin

Ales Kovarik 1*, John Chris Pires 2, Andrew Rowand Leitch 3, Kar Yoong Lim 3, Annie Sherwood 4, Roman Matyasek 1, Jennifer Rocca 5, Douglas Soltis 6 and Pamela Soltis 5

1 Institute of Biophysics, Academy of Sciences, Czech Republic
2 Department of Agronomy, University of Wisconsin, USA
3 School of Biological Sciences, Queen Mary, University of London, UK
4 School of Biological Sciences, Washington State University, USA
5 Florida Museum of Natural History, University of Florida, USA
6 Department of Botany, University of Florida, USA

* To whom correspondence should be addressed. E-mail: kovarik{at}ibp.cz.

Submitted on June 25, 2004
Revised on September 27, 2004
Accepted on 27 September 2004


  Abstract
We investigated concerted evolution of rRNA genes in multiple populations of Tragopogon mirus and T. miscellus, two allotetraploids that formed recently (the last 80 years) and recurrently following the introduction of three diploids (T. dubius, T. pratensis, and T. porrifolius) from Eurasia to North America. Using the first herbarium specimens of the allotetraploids (1949 and 1953) to represent the genomic condition close to the time of polyploidization, we found that the parental rDNA repeats were inherited in roughly equal numbers. In contrast, in most present day populations the rDNA of T. dubius origin is partially lost and may occupy as little as 5% of total rDNA in some individuals. However, in one population of T. mirus the repeats of T. dubius origin outnumber the repeats of the second diploid parent (T. porrifolius) indicating that bidirectional concerted evolution within a single species is possible as previously shown at the level of genus (e.g. Gossypium). In plants of T. miscellus having a low rDNA contribution from T. dubius, the rDNA of T. dubius was nonetheless expressed. We have apparently caught homogenization of rDNA repeats (concerted evolution) in the act; it has not proceeded to completion in any allopolyploid population of independent origin examined.

Key Words: Tragopogon, allopolyploidy, concerted evolution, homogenization, internal transcribed spacer




This article has been cited by other articles:


Home page
 ANN BOT (LOND)Home page
A. Kovarik, M. Dadejova, Y. K. Lim, M. W. Chase, J. J. Clarkson, S. Knapp, and A. R. Leitch
Evolution of rDNA in Nicotiana Allopolyploids: A Potential Link between rDNA Homogenization and Epigenetics
Ann. Bot., April 1, 2008; 101(6): 815 - 823.
[Abstract] [Full Text] [PDF]

Home page
 Plant CellHome page
R. T. Gaeta, J. C. Pires, F. Iniguez-Luy, E. Leon, and T. C. Osborn
Genomic Changes in Resynthesized Brassica napus and Their Effect on Gene Expression and Phenotype
PLANT CELL, November 1, 2007; 19(11): 3403 - 3417.
[Abstract] [Full Text] [PDF]

Home page
 ANN BOT (LOND)Home page
K. Y. Lim, R. Matyasek, A. Kovarik, and A. Leitch
Parental Origin and Genome Evolution in the Allopolyploid Iris versicolor
Ann. Bot., August 1, 2007; 100(2): 219 - 224.
[Abstract] [Full Text] [PDF]

Home page
 GeneticsHome page
R. Matyasek, J. A. Tate, Y. K. Lim, H. Srubarova, J. Koh, A. R. Leitch, D. E. Soltis, P. S. Soltis, and A. Kovarik
Concerted Evolution of rDNA in Recently Formed Tragopogon Allotetraploids Is Typically Associated With an Inverse Correlation Between Gene Copy Number and Expression
Genetics, August 1, 2007; 176(4): 2509 - 2519.
[Abstract] [Full Text] [PDF]

Home page
 Genome Res.Home page
A. R.D. Ganley and T. Kobayashi
Highly efficient concerted evolution in the ribosomal DNA repeats: Total rDNA repeat variation revealed by whole-genome shotgun sequence data
Genome Res., February 1, 2007; 17(2): 184 - 191.
[Abstract] [Full Text] [PDF]

Home page
 GeneticsHome page
J. A. Tate, Z. Ni, A.-C. Scheen, J. Koh, C. A. Gilbert, D. Lefkowitz, Z. J. Chen, P. S. Soltis, and D. E. Soltis
Evolution and Expression of Homeologous Loci in Tragopogon miscellus (Asteraceae), a Recent and Reciprocally Formed Allopolyploid
Genetics, July 1, 2006; 173(3): 1599 - 1611.
[Abstract] [Full Text] [PDF]

Home page
 Am. J. Bot.Home page
S. Truyens, M. M. Arbo, and J. S. Shore
Phylogenetic relationships, chromosome and breeding system evolution in Turnera (Turneraceae): inferences from its sequence data
Am. J. Botany, October 1, 2005; 92(10): 1749 - 1758.
[Abstract] [Full Text] [PDF]

Home page
 Plant Physiol.Home page
B. Koukalova, M. Fojtova, K. Y. Lim, J. Fulnecek, A. R. Leitch, and A. Kovarik
Dedifferentiation of Tobacco Cells Is Associated with Ribosomal RNA Gene Hypomethylation, Increased Transcription, and Chromatin Alterations
Plant Physiology, September 1, 2005; 139(1): 275 - 286.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH
Copyright © 2005 by the Genetics Society of America.