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A high-density cytogenetic map of the Aegilops tauschii genome incorporating retrotransposons and defense-related genes: insights into cereal chromosome structure and function

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Abstract

Aegilops tauschii (Coss.) Schmal. (2n=2x=14, DD) (syn. A. squarrosa L.; Triticum tauschii) is well known as the D-genome donor of bread wheat (T. aestivum, 2n=6x=42, AABBDD). Because of conserved synteny, a high-density map of the A. tauschii genome will be useful for breeding and genetics within the tribe Triticeae which besides bread wheat also includes barley and rye. We have placed 249 new loci onto a high-density integrated cytological and genetic map of A. tauschii for a total of 732 loci making it one of the most extensive maps produced to date for the Triticeae species. Of the mapped loci, 160 are defense-related genes. The retrotransposon marker system recently developed for cultivated barley (Hordeum vulgare L.) was successfully applied to A. tauschii with the placement of 80 retrotransposon loci onto the map. A total of 50 microsatellite and ISSR loci were also added. Most of the retrotransposon loci, resistance (R), and defense-response (DR) genes are organized into clusters: retrotransposon clusters in the pericentromeric regions, R and DR gene clusters in distal/telomeric regions. Markers are non-randomly distributed with low density in the pericentromeric regions and marker clusters in the distal regions. A significant correlation between the physical density of markers (number of markers mapped to the chromosome segment/physical length of the same segment in μm) and recombination rate (genetic length of a chromosome segment/physical length of the same segment in μm) was demonstrated. Discrete regions of negative or positive interference (an excess or deficiency of crossovers in adjacent intervals relative to the expected rates on the assumption of no interference) was observed in most of the chromosomes. Surprisingly, pericentromeric regions showed negative interference. Islands with negative, positive and/or no interference were present in interstitial and distal regions. Most of the positive interference was restricted to the long arms. The model of chromosome structure and function in cereals with large genomes that emerges from these studies is discussed.

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Authors and Affiliations

  1. Wheat Genetics Resource Center, 4024 Throckmorton Plant Sciences Center, Kansas State University, Manhattan, KS , 66506-5502, USA

    Elena Boyko & Bikram S. Gill

  2. Institute of Biotechnology, University of Helsinki, Plant Genomics Laboratory, Viikki Biocenter, P.O. Box 56, Viikinkaari 6, 00014, Helsinki, Finland

    Ruslan Kalendar & Alan H. Schulman

  3. Institute of Plant Genetics and Crop Plant Research, Correnstrasse 3, 06566, Gatersleben, Germany

    Victor Korzun

  4. USDA-ARS, Plant Science Unit, Kansas State University, Manhattan, KS, 66506-5502, USA

    John Fellers

  5. Institute of Evolution, University of Haifa, Mount Carmel, Haifa, 31905, Israel

    Abraham Korol

  6. Crops and Biotechnology, Agrifood Research Finland, Myllytie 10, 31600, Jokioinen, Finland

    Alan H. Schulman

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Boyko, E., Kalendar, R., Korzun, V. et al. A high-density cytogenetic map of the Aegilops tauschii genome incorporating retrotransposons and defense-related genes: insights into cereal chromosome structure and function. Plant Mol Biol 48, 767–789 (2002). https://doi.org/10.1023/A:1014831511810

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