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Physical mapping of repetitive DNA sequences and 5S and 18S–26S rDNA in five wild species of the genusHordeum

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The genetic relationships between several wild species and subspecies of the genusHordeum were assessed using fluorescencein situ hybridization (FISH). Plant material included natural populations of wild barley growing in Spain of the annual species,H. marinum ssp.marinum (2n=14) andgussoneanum (2n=14), andH. murinum ssp.murinum (2n=28), andleporinum (2n=28) and the perennial speciesH. bulbosum (2n=14) andH. secalinum (2n=28), plus the South American perennial speciesH. chilense (2n=14). FISH was used to locate the chromosomal sites of two rDNA multigene families 5S and 18S–26S (pTa71 and pTa794) and three repetitive DNA sequences (pSc119.2, pAs1 and pHch950) isolated from different species and genera. The seven chromosomes of the diploid species were readily distinguished by their external morphology and hybridization patterns to pTa71, pTa794, pSc119.2 and pAs1. These DNA probes were also useful for the identification of homologous chromosomes and in differentiating these from unidentified chromosomes in the tetraploid taxa. The use of the probe pHch950 permitted intergenomic differentiation in tetraploids and supports the diphyletic origin ofH. murinum andH. secalinum. Thein situ experiments yielded the following conclusions: (1) differences between the subspeciesmarinum andgussoneanum; (2) close relationships between the subspeciesmurinum andLeporinum; and (3) major differences in physical mapping betweenH. bulbosum and the remaining taxa. The genomic and phylogenetic relationships between taxa, as inferred from the results, are discussed.

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Correspondence to N. Jouve.

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accepted by J.S. (Pat) Heslop-Harrison

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de Bustos, A., Cuadrado, A., Soler, C. et al. Physical mapping of repetitive DNA sequences and 5S and 18S–26S rDNA in five wild species of the genusHordeum . Chromosome Res 4, 491–499 (1996). https://doi.org/10.1007/BF02261776

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Key words

  • barley, fluorescencein situ hybridization
  • Hordeum bulbosum
  • Hordeum chilense
  • Hordeum marinum
  • Hordeum murinum
  • Hordeum secalinum
  • repetitive DNA