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

Moshe Feldman, Bao Liu, Gregorio Segal, Shahal Abbo, Avraham A. Levy and Juan M. Vega
Genetics November 1, 1997 vol. 147 no. 3 1381-1387
Moshe Feldman
Department of Plant Genetics, The Weizmann Institute of Science, Rehovot 76100, Israel
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Bao Liu
Department of Plant Genetics, The Weizmann Institute of Science, Rehovot 76100, Israel
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Gregorio Segal
Department of Plant Genetics, The Weizmann Institute of Science, Rehovot 76100, Israel
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Shahal Abbo
Department of Plant Genetics, The Weizmann Institute of Science, Rehovot 76100, Israel
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Avraham A. Levy
Department of Plant Genetics, The Weizmann Institute of Science, Rehovot 76100, Israel
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Juan M. Vega
Department of Plant Genetics, The Weizmann Institute of Science, Rehovot 76100, Israel
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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, lowcopy, 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.

  • Received May 29, 1997.
  • Accepted August 4, 1997.
  • Copyright © 1997 by the Genetics Society of America
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Volume 147 Issue 3, November 1997

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

Moshe Feldman, Bao Liu, Gregorio Segal, Shahal Abbo, Avraham A. Levy and Juan M. Vega
Genetics November 1, 1997 vol. 147 no. 3 1381-1387
Moshe Feldman
Department of Plant Genetics, The Weizmann Institute of Science, Rehovot 76100, Israel
  • Find this author on Google Scholar
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Bao Liu
Department of Plant Genetics, The Weizmann Institute of Science, Rehovot 76100, Israel
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Gregorio Segal
Department of Plant Genetics, The Weizmann Institute of Science, Rehovot 76100, Israel
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Shahal Abbo
Department of Plant Genetics, The Weizmann Institute of Science, Rehovot 76100, Israel
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Avraham A. Levy
Department of Plant Genetics, The Weizmann Institute of Science, Rehovot 76100, Israel
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Juan M. Vega
Department of Plant Genetics, The Weizmann Institute of Science, Rehovot 76100, Israel
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Citation

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

Moshe Feldman, Bao Liu, Gregorio Segal, Shahal Abbo, Avraham A. Levy and Juan M. Vega
Genetics November 1, 1997 vol. 147 no. 3 1381-1387
Moshe Feldman
Department of Plant Genetics, The Weizmann Institute of Science, Rehovot 76100, Israel
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Bao Liu
Department of Plant Genetics, The Weizmann Institute of Science, Rehovot 76100, Israel
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Gregorio Segal
Department of Plant Genetics, The Weizmann Institute of Science, Rehovot 76100, Israel
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Shahal Abbo
Department of Plant Genetics, The Weizmann Institute of Science, Rehovot 76100, Israel
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Avraham A. Levy
Department of Plant Genetics, The Weizmann Institute of Science, Rehovot 76100, Israel
  • Find this author on Google Scholar
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Juan M. Vega
Department of Plant Genetics, The Weizmann Institute of Science, Rehovot 76100, Israel
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  • Search for this author on this site

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