Similar patterns of rDNA evolution in synthetic and recently formed natural populations of Tragopogon(Asteraceae) allotetraploids |
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| Authors: | Hana Malinska Jennifer A Tate Roman Matyasek Andrew R Leitch Douglas E Soltis Pamela S Soltis Ales Kovarik |
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| Affiliation: | (1) Institute of Biophysics, Academy of Sciences of the Czech Republic, v.v.i, Laboratory of Molecular Epigenetics, CZ-61265 Kralovopolska 135, Brno, Czech Republic;(2) Institute of Molecular BioSciences, Massey University, 4442 Palmerston North, New Zealand;(3) School of Biological Sciences, Queen Mary University of London, E1 4NS, UK;(4) Department of Biology, University of Florida, 32611 Gainesville, FL, USA;(5) Florida Museum of Natural History, University of Florida, 32611 Gainesville, FL, USA |
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| Abstract: | ![]()
Background Tragopogon mirus and T. miscellus are allotetraploids (2n = 24) that formed repeatedly during the past 80 years in eastern Washington and adjacent Idaho (USA) following the introduction of the diploids T. dubius, T. porrifolius, and T. pratensis (2n = 12) from Europe. In most natural populations of T. mirus and T. miscellus, there are far fewer 35S rRNA genes (rDNA) of T. dubius than there are of the other diploid parent (T. porrifolius or T. pratensis). We studied the inheritance of parental rDNA loci in allotetraploids resynthesized from diploid accessions. We investigate the dynamics and directionality of these rDNA losses, as well as the contribution of gene copy number variation in the parental diploids to rDNA variation in the derived tetraploids. |
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