Theoretical and Applied Genetics

, Volume 110, Issue 6, pp 1011–1019 | Cite as

Chromosomal rearrangements differentiating the ryegrass genome from the Triticeae, oat, and rice genomes using common heterologous RFLP probes

  • S. Sim
  • T. Chang
  • J. Curley
  • S. E. Warnke
  • R. E. Barker
  • G. Jung
Original Paper


An restriction fragment length polymorphism (RFLP)-based genetic map of ryegrass (Lolium) was constructed for comparative mapping with other Poaceae species using heterologous anchor probes. The genetic map contained 120 RFLP markers from cDNA clones of barley (Hordeum vulgare L.), oat (Avena sativa L.), and rice (Oryza sativa L.), covering 664 cM on seven linkage groups (LGs). The genome comparisons of ryegrass relative to the Triticeae, oat, and rice extended the syntenic relationships among the species. Seven ryegrass linkage groups were represented by 10 syntenic segments of Triticeae chromosomes, 12 syntenic segments of oat chromosomes, or 16 syntenic segments of rice chromosomes, suggesting that the ryegrass genome has a high degree of genome conservation relative to the Triticeae, oat, and rice. Furthermore, we found ten large-scale chromosomal rearrangements that characterize the ryegrass genome. In detail, a chromosomal rearrangement was observed on ryegrass LG4 relative to the Triticeae, four rearrangements on ryegrass LGs2, 4, 5, and 6 relative to oat, and five rearrangements on ryegrass LGs1, 2, 4, 5, and 7 relative to rice. Of these, seven chromosomal rearrangements are reported for the first time in this study. The extended comparative relationships reported in this study facilitate the transfer of genetic knowledge from well-studied major cereal crops to ryegrass.


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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • S. Sim
    • 1
  • T. Chang
    • 1
  • J. Curley
    • 1
  • S. E. Warnke
    • 2
  • R. E. Barker
    • 3
  • G. Jung
    • 1
  1. 1.Department of Plant PathologyUniversity of Wisconsin-MadisonUSA
  2. 2.National ArboretumWashington
  3. 3.USDA-ARS National Forage Seed Production Research CenterCorvallisUSA

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