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Genetics. Nov 1997; 147(3): 1381–1387.
PMCID: PMC1208259

Rapid Elimination of Low-Copy DNA Sequences in Polyploid Wheat: A Possible Mechanism for Differentiation of Homoeologous Chromosomes

Abstract

To study genome evolution in allopolyploid plants, we analyzed polyploid wheats and their diploid progenitors for the occurrence of 16 low-copy chromosome- or genome-specific sequences isolated from hexaploid wheat. Based on their occurrence in the diploid species, we classified the sequences into two groups: group I, found in only one of the three diploid progenitors of hexaploid wheat, and group II, found in all three diploid progenitors. The absence of group II sequences from one genome of tetraploid wheat and from two genomes of hexaploid wheat indicates their specific elimination from these genomes at the polyploid level. Analysis of a newly synthesized amphiploid, having a genomic constitution analogous to that of hexaploid wheat, revealed a pattern of sequence elimination similar to the one found in hexaploid wheat. Apparently, speciation through allopolyploidy is accompanied by a rapid, nonrandom elimination of specific, low-copy, probably noncoding DNA sequences at the early stages of allopolyploidization, resulting in further divergence of homoeologous chromosomes (partially homologous chromosomes of different genomes carrying the same order of gene loci). We suggest that such genomic changes may provide the physical basis for the diploid-like meiotic behavior of polyploid wheat.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
  • Galili G, Levy AA, Feldman M. Gene-dosage compensation of endosperm proteins in hexaploid wheat Triticum aestivum. Proc Natl Acad Sci U S A. 1986 Sep;83(17):6524–6528. [PMC free article] [PubMed]
  • Hawley RS, Arbel T. Yeast genetics and the fall of the classical view of meiosis. Cell. 1993 Feb 12;72(3):301–303. [PubMed]
  • Rieseberg LH, Sinervo B, Linder CR, Ungerer MC, Arias DM. Role of Gene Interactions in Hybrid Speciation: Evidence from Ancient and Experimental Hybrids. Science. 1996 May 3;272(5262):741–745. [PubMed]
  • Sears ER. Genetic control of chromosome pairing in wheat. Annu Rev Genet. 1976;10:31–51. [PubMed]
  • Song K, Lu P, Tang K, Osborn TC. Rapid genome change in synthetic polyploids of Brassica and its implications for polyploid evolution. Proc Natl Acad Sci U S A. 1995 Aug 15;92(17):7719–7723. [PMC free article] [PubMed]
  • Vega M, Abbo S, Feldman M, Levy AA. Chromosome painting in plants: in situ hybridization with a DNA probe from a specific microdissected chromosome arm of common wheat. Proc Natl Acad Sci U S A. 1994 Dec 6;91(25):12041–12045. [PMC free article] [PubMed]
  • Wendel JF, Schnabel A, Seelanan T. Bidirectional interlocus concerted evolution following allopolyploid speciation in cotton (Gossypium). Proc Natl Acad Sci U S A. 1995 Jan 3;92(1):280–284. [PMC free article] [PubMed]

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