Theoretical and Applied Genetics

, Volume 96, Issue 1, pp 69–75 | Cite as

Relationships between the chromosomes of Aegilops umbellulata and wheat

  • H. Zhang
  • J. Jia
  • M. D. Gale
  • K. M. Devos

Abstract

 A comparative genetic map of Aegilops umbellulata with wheat was constructed using RFLP probes that detect homoeoloci previously mapped in hexaploid bread wheat. All seven Ae. umbellulata chromosomes display one or more rearrangements relative to wheat. These structural changes are consistent with the sub-terminal morphology of chromosomes 2 U, 3 U, 6 U and 7 U. Comparison of the chromosomal locations assigned by mapping and those obtained by hybridization to wheat/Ae. umbellulata single chromosome addition lines verified the composition of the added Ae. umbellulata chromosomes and indicated that no further cytological rearrangements had taken place during the production of the alien-wheat aneuploid lines. Relationships between Ae. umbellulata and wheat chromosomes were confirmed, based on homoeology of the centromeric regions, for 1 U, 2 U, 3 U, 5 U and 7 U. However, homoeology of the centromeric regions of 4 U with wheat group-6 chromosomes and of 6 U with wheat group-4 chromosomes was also confirmed, suggesting that a re-naming of these chromosomes may be pertinent. The consequences of the rearrangements of the Ae. umbellulata genome relative to wheat for gene introgression are discussed.

Key words Aegilops umbellulata Co-linearity Comparative mapping Translocations Triticum aestivum Wheat 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag Berlin Heidelberg 1998

Authors and Affiliations

  • H. Zhang
    • 1
  • J. Jia
    • 1
  • M. D. Gale
    • 1
  • K. M. Devos
    • 1
  1. 1.John Innes Centre, Norwich Research Park, Colney, Norwich NR4 7UH, UK Fax: +44 1603 502241 E-mail: devos@bbsrc.ac.ukGB

Personalised recommendations