- THIS ARTICLE
- Full Text
- Full Text (PDF)
- Supplemental Material
-
All Versions of this Article:
genetics.104.032839v1
169/2/931 most recent - Alert me when this article is cited
- Alert me if a correction is posted
- SERVICES
- Similar articles in this journal
- Similar articles in PubMed
- Alert me to new issues of the journal
- Download to citation manager
- Reprints & Permissions
- CITING ARTICLES
- Citing Articles via HighWire
- Citing Articles via Google Scholar
- GOOGLE SCHOLAR
- Articles by Kovarik, A.
- Articles by Soltis, P. S.
- Search for Related Content
- PUBMED
- PubMed Citation
- Articles by Kovarik, A.
- Articles by Soltis, P. S.
Originally published as Genetics Published Articles Ahead of Print on January 16, 2005.
Genetics, Vol. 169, 931-944, February 2005, Copyright © 2005
doi:10.1534/genetics.104.032839
Rapid Concerted Evolution of Nuclear Ribosomal DNA in Two Tragopogon Allopolyploids of Recent and Recurrent Origin
A. Kovarik*,1,
J. C. Pires
,
A. R. Leitch
,
K. Y. Lim,
A. M. Sherwood
,
R. Matyasek*,
J. Rocca**,
D. E. Soltis and
P. S. Soltis**
* Institute of Biophysics, Academy of Sciences of the Czech Republic, CS-61265 Brno, Czech Republic
Department of Botany, University of Florida, Gainesville, Florida 32611
** Florida Museum of Natural History, University of Florida, Gainesville, Florida 32611
Department of Agronomy, University of Wisconsin, Madison, Wisconsin 53706
School of Biological Sciences, Queen Mary, University of London, London E1 4NS, United Kingdom
School of Biological Sciences, Washington State University, Pullman, Washington 99164
1 Corresponding author: Institute of Biophysics, Academy of Sciences of the Czech Republic, Královopolská 135, 612 65 Brno, Czech Republic.
E-mail: kovarik{at}ibp.cz
We investigated concerted evolution of rRNA genes in multiple populations of Tragopogon mirus and T. miscellus, two allotetraploids that formed recurrently within the last 80 years following the introduction of three diploids (T. dubius, T. pratensis, and T. porrifolius) from Europe to North America. Using the earliest herbarium specimens of the allotetraploids (1949 and 1953) to represent the genomic condition near the time of polyploidization, we found that the parental rDNA repeats were inherited in roughly equal numbers. In contrast, in most present-day populations of both tetraploids, the rDNA of T. dubius origin is reduced and may occupy as little as 5% of total rDNA in some individuals. However, in two populations of T. mirus the repeats of T. dubius origin outnumber the repeats of the second diploid parent (T. porrifolius), indicating bidirectional concerted evolution within a single species. 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, although it has not proceeded to completion in any allopolyploid population yet examined.
This article has been cited by other articles:
 |
|
 |
|
  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]
|
|
|
|
 |
|
 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]
|
|
|
|
|
|
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]
|
|
|
|
 |
|
 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]
|
|
|
|
 |
|
 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]
|
|
|
|
|
|
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]
|
|
|
|
 |
|
 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]
|
|
|
|
 |
|
 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]
|
|