High resolution mapping of dense spike-ar (dsp.ar) to the genetic centromere of barley chromosome 7H

Fahimeh Shahinnia, Arnis Druka, Jerome Franckowiak, Michele Morgante, Robbie Waugh, Nils Stein

    Research output: Contribution to journalArticle

    28 Citations (Scopus)

    Abstract

    Spike density in barley is under the control of several major genes, as documented previously by genetic analysis of a number of morphological mutants. One such class of mutants affects the rachis internode length leading to dense or compact spikes and the underlying genes were designated dense spike (dsp). We previously delimited two introgressed genomic segments on chromosome 3H (21 SNP loci, 35.5 cM) and 7H (17 SNP loci, 20.34 cM) in BW265, a BC 7F 3 nearly isogenic line (NIL) of cv. Bowman as potentially containing the dense spike mutant locus dsp.ar, by genotyping 1,536 single nucleotide polymorphism (SNP) markers in both BW265 and its recurrent parent. Here, the gene was allocated by highresolution bi-parental mapping to a 0.37 cM interval between markers SC57808 (Hv_SPL14)-CAPSK06413 residing on the short and long arm at the genetic centromere of chromosome 7H, respectively. This region putatively contains more than 800 genes as deduced by comparison with the collinear regions of barley, rice, sorghum and Brachypodium, Classical map-based isolation of the gene dsp.ar thus will be complicated due to the infavorable relationship of genetic to physical distances at the target locus.

    Original languageEnglish
    Pages (from-to)373-384
    Number of pages12
    JournalTheoretical and Applied Genetics
    Volume124
    Issue number2
    DOIs
    Publication statusPublished - Feb 2012

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