Theoretical and Applied Genetics

, Volume 112, Issue 5, pp 945–957 | Cite as

A microcolinearity study at the earliness per se gene Eps-Am1 region reveals an ancient duplication that preceded the wheat–rice divergence

Original Paper

Abstract

Wheat flowering is controlled by numerous genes, which respond to environmental signals such as photoperiod and vernalization. Earliness per se (Eps) genes control flowering time independently of these environmental cues and are responsible for the fine tuning of flowering time. We recently mapped the Eps-Am1 gene on the end of Triticum monococcum chromosome arm 1AmL. As a part of our efforts to clone Eps-Am1 we developed PCR markers flanking this gene within a 2.7 cM interval. We screened more than one thousand gametes with these markers and identified 27 lines with recombination between them. Recombinant lines were used to generate a high-density map and to investigate the microcolinearity between wheat and rice in this region. We mapped ten genes from a 149 kb region located at the distal part of rice chromosome 5 (cdo393 – Ndk3) on a 3.7 cM region on wheat chromosome one. This region is part of an ancient duplication between rice chromosomes 5 and 1. Genes present in both rice chromosomes were less similar to each other than to the closest wheat orthologues, suggesting that this duplication preceded the divergence between wheat and rice. This hypothesis was supported by the presence of 18 loci duplicated both in rice chromosomes 5 and 1 and in the colinear wheat chromosomes from homoeologous groups 1 and 3. Independent gene deletions in wheat and rice lineages explain the alternations of colinearity between rice chromosome 5 and wheat chromosomes 1 and 3. Colinearity between the end of rice chromosome 5 and wheat chromosome 1 was also interrupted by a small inversion, and several non-colinear genes. These results suggest that the distal region of the long arm of wheat chromosome 1 was involved in numerous changes that differentiated wheat and rice genomes. This comparative study provided sufficient markers to saturate the Eps-Am1 gene region and to precisely map this gene within a 0.9 cM interval flanked by the VatpC and Smp loci.

Keywords

Flowering time Earliness per se Wheat Rice Duplication Microcolinearity 

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Department of Plant SciencesUniversity of CaliforniaDavisUSA
  2. 2.Department of Biotechnology and CytogeneticsPlant Breeding and Acclimatization Institute RadzikówBloniePoland

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