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First published online January 19, 2005; 10.1105/tpc.104.028225

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The Plant Cell 17:361-374 (2005)
© 2005 American Society of Plant Biologists

Large Intraspecific Haplotype Variability at the Rph7 Locus Results from Rapid and Recent Divergence in the Barley Genome{boxw}

Beatrice Scherrera, Edwige Isidorea, Patricia Kleinb, Jeong-soon Kimb, Arnaud Bellecc, Boulos Chalhoubc, Beat Kellera and Catherine Feuilleta,1

a Institute of Plant Biology, University of Zürich, 8008 Zürich, Switzerland
b Institute for Plant Genomics and Biotechnology, Texas A&M University, College Station, Texas 77843-2123
c Institut National de la Recherche Agronomique, Unité de Génomique Végétale, CP 5708, 91057 Evry, France

1 To whom correspondence should be addressed. E-mail catherine.feuillet{at}clermont.inra.fr; fax 33-4-73-62-44-53.

To study genome evolution and diversity in barley (Hordeum vulgare), we have sequenced and compared more than 300 kb of sequence spanning the Rph7 leaf rust disease resistance gene in two barley cultivars. Colinearity was restricted to five genic and two intergenic regions representing <35% of the two sequences. In each interval separating the seven conserved regions, the number and type of repetitive elements were completely different between the two homologous sequences, and a single gene was absent in one cultivar. In both cultivars, the nonconserved regions consisted of ~53% repetitive sequences mainly represented by long-terminal repeat retrotransposons that have inserted <1 million years ago. PCR-based analysis of intergenic regions at the Rph7 locus and at three other independent loci in 41 H. vulgare lines indicated large haplotype variability in the cultivated barley gene pool. Together, our data indicate rapid and recent divergence at homologous loci in the genome of H. vulgare, possibly providing the molecular mechanism for the generation of high diversity in the barley gene pool. Finally, comparative analysis of the gene composition in barley, wheat (Triticum aestivum), rice (Oryza sativa), and sorghum (Sorghum bicolor) suggested massive gene movements at the Rph7 locus in the Triticeae lineage.




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