作者
K Yoong Lim, Douglas E Soltis, Pamela S Soltis, Jennifer Tate, Roman Matyasek, Hana Srubarova, Ales Kovarik, J Chris Pires, Zhiyong Xiong, Andrew R Leitch
发表日期
2008/10/9
期刊
PloS one
卷号
3
期号
10
页码范围
e3353
出版商
Public Library of Science
简介
Background
Polyploidy, frequently termed “whole genome duplication”, is a major force in the evolution of many eukaryotes. Indeed, most angiosperm species have undergone at least one round of polyploidy in their evolutionary history. Despite enormous progress in our understanding of many aspects of polyploidy, we essentially have no information about the role of chromosome divergence in the establishment of young polyploid populations. Here we investigate synthetic lines and natural populations of two recently and recurrently formed allotetraploids Tragopogon mirus and T. miscellus (formed within the past 80 years) to assess the role of aberrant meiosis in generating chromosomal/genomic diversity. That diversity is likely important in the formation, establishment and survival of polyploid populations and species.
Methodology/Principal Findings
Applications of fluorescence in situ hybridisation (FISH) to natural populations of T. mirus and T. miscellus suggest that chromosomal rearrangements and other chromosomal changes are common in both allotetraploids. We detected extensive chromosomal polymorphism between individuals and populations, including (i) plants monosomic and trisomic for particular chromosomes (perhaps indicating compensatory trisomy), (ii) intergenomic translocations and (iii) variable sizes and expression patterns of individual ribosomal DNA (rDNA) loci. We even observed karyotypic variation among sibling plants. Significantly, translocations, chromosome loss, and meiotic irregularities, including quadrivalent formation, were observed in synthetic (S0 and S1 generations) polyploid lines. Our results not only …
引用总数
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KY Lim, DE Soltis, PS Soltis, J Tate, R Matyasek… - PloS one, 2008