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Microsatellite mapping of the genes for brittle rachis on homoeologous group 3 chromosomes in tetraploid and hexaploid wheats

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Abstract

The brittle rachis character, which causes spontaneous shattering of spikelets, has an adaptive value in wild grass species. The lociBr 1 andBr 2 in durum wheat (Triticum durum Desf.) andBr 3 in hexaploid wheat (T. aestivum L.) determine disarticulation of rachides above the junction of the rachilla with the rachis such that a fragment of rachis is attached below each spikelet. Using microsatellite markers, the lociBr 1 ,Br 2 andBr 3 were mapped on the homoeologous group 3 chromosomes. TheBr 2 locus was located on the short arm of chromosome 3A and linked with the centromeric marker,Xgwm32, at a distance of 13.3 cM. TheBr 3 locus was located on the short arm of chromosome 3B and linked with the centromeric marker,Xgwm72 (at a distance of 14.2 cM). TheBr 1 locus was located on the short arm of chromosome 3D. The distance ofBr 1 from the centromeric markerXgdm72 was 25.3 cM. Mapping theBr 1 ,Br 2 andBr 3 loci of the brittle rachis suggests the homoeologous origin of these 3 loci for brittle rachides. Since the genes for brittle rachis have been retained in the gene pool of durum wheat, the more closely linked markers with the brittle rachis locus are required to select against brittle rachis genotypes and then to avoid yield loss in improved cultivars.

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Authors and Affiliations

  1. Faculty of Applied Biological Sciences, Gifu University, Yanagido, Gifu, Japan

    Nobuyoshi Watanabe, Youko Fujii & Noriko Kato

  2. JIRCAS, Ohwashi, Tsukuba, Japan

    Tomohiro Ban

  3. Agrotest, Agricultural Testing, Advisory Services and Research, Ltd., Kroměří, Czech Republic

    Petr Martinek

  4. College of Agriculture, Ibaraki University, 3-21-1 Chuo, Ami, Inashiki, 300-0393, Ibaraki, Japan

    Nobuyoshi Watanabe

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  1. Nobuyoshi Watanabe
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  2. Youko Fujii
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  3. Noriko Kato
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  4. Tomohiro Ban
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  5. Petr Martinek
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Correspondence to Nobuyoshi Watanabe.

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Watanabe, N., Fujii, Y., Kato, N. et al. Microsatellite mapping of the genes for brittle rachis on homoeologous group 3 chromosomes in tetraploid and hexaploid wheats. J Appl Genet 47, 93–98 (2006). https://doi.org/10.1007/BF03194606

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  • DOI: https://doi.org/10.1007/BF03194606

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