Mapping of QTL for intermedium spike on barley chromosome 4H using EST-based markers

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  • Shahinnia Fahimeh
    Plant Genome Research Unit, National Institute of Agrobiological Sciences (NIAS) Department of Agronomy and Plant Breeding, Isfahan University of Technology Present address: Department of Gene Bank, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK)
  • Ebrahim Sayed-Tabatabaei Badraldin
    Department of Biotechnology, Isfahan University of Technology
  • Sato Kazuhiro
    Research Institute for Bioresources, Okayama University
  • Pourkheirandish Mohammad
    Plant Genome Research Unit, National Institute of Agrobiological Sciences (NIAS)
  • Komatsuda Takao
    Plant Genome Research Unit, National Institute of Agrobiological Sciences (NIAS)

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The lateral spikelets of two-rowed barley are reduced in size and sterile, but in six-rowed barley all three spikelets are fully fertile. The trait is largely controlled by alleles at the vrs1 locus on chromosome arm 2HL, as modified by the allele present at the I locus on chromosome arm 4HS. Molecular markers were developed to saturate the 4HS region by exploiting expressed sequence-tags, either previously mapped in barley to this region, or present in the syntenic region of rice chromosome 3. Collinearity between rice and barley was strong in the 4.8 cM interval BJ468164–AV933435 and the 10 cM interval AV942364–BJ455560. A major QTL for lateral spikelet fertility (the I locus) explained 44% of phenotypic variance, and was located in the interval CB873567–BJ473916. The genotyping of near-isogenic lines for I placed the locus in a region between CB873567 and EBmac635, and therefore the most likely position of the I locus was proximal to CB873567 in a 5.3 cM interval between CB873567–BJ473916.<br>

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