Functional & Integrative Genomics

, Volume 4, Issue 1, pp 59–66 | Cite as

Microcolinearity between a 2-cM region encompassing the grain protein content locus Gpc-6B1 on wheat chromosome 6B and a 350-kb region on rice chromosome 2

  • Assaf Distelfeld
  • Cristobal Uauy
  • Sofia Olmos
  • Ana R. Schlatter
  • Jorge Dubcovsky
  • Tzion Fahima
Original Paper

Abstract

The conservation of the linear order (colinearity) of genetic markers along large chromosome segments in wheat and rice is well established, but less is known about the microcolinearity between both genomes at subcentimorgan distances. In this study we focused on the microcolinearity between a 2.6-cM interval flanked by markers Xcdo365 and Xucw65 on wheat chromosome 6B and rice chromosome 2. A previous study has shown that this wheat segment includes the Gpc-6B1 locus, which is responsible for large differences in grain protein content (GPC) and is the target of a positional cloning effort in our laboratories. Twenty-one recombination events between Xcdo365 and Xucw65 were found in a large segregating population (935 gametes) and used to map 17 genes selected from rice chromosome 2 in the wheat genetic map. We found a high level of colinearity between a 2.1-cM region flanked by loci Xucw75 and Xucw67 on wheat chromosome 6B and a 350-kb uninterrupted sequenced region in rice chromosome arm 2S. Colinearity between these two genomes was extended to the region proximal to Xucw67 (eight colinear RFLP markers), but was interrupted distal to Xucw75 (six non-colinear RFLP markers). Analysis of different comparative studies between rice and wheat suggests that microcolinearity is more frequently disrupted in the distal region of the wheat chromosomes. Fortunately, the region encompassing the Gpc-6B1 locus showed an excellent conservation between the two genomes, facilitating the saturation of the target region of the wheat genetic map with molecular markers. These markers were used to map the Gpc-6B1 locus into a 0.3-cM interval flanked by PCR markers Xucw79 and Xucw71, and to identify five candidate genes within the colinear 64-kb region in rice.

Keywords

Triticum turgidum var. dicoccoides Grain protein content Colinearity Genetic map Rice 

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Assaf Distelfeld
    • 1
  • Cristobal Uauy
    • 2
  • Sofia Olmos
    • 2
  • Ana R. Schlatter
    • 3
  • Jorge Dubcovsky
    • 2
  • Tzion Fahima
    • 1
  1. 1.Institute of EvolutionUniversity of HaifaHaifaIsrael
  2. 2.Department of Agronomy and Range ScienceUniversity of CaliforniaDavisUSA
  3. 3.INTA EEA PergaminoBuenos AiresArgentina

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