The Barley Chromosome 5 Linkage Map: II: Extension of the Map with Four Loci

J. Jensen, Jørgen Helms Jørgensen

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    The distances between nine loci on barley chromosome 5 have been studied in five two-point tests, three three-point tests, and one four-point test. Our previous chromosome 5 linkage map, which contained eleven loci mapped from literature data (Jensen and Jørgensen 1975), is extended with four loci: wst5 (white streaks), necl (necrotic leaf spots), Ml-nn (powdery mildew resistance), and Pa4 (leaf rust resistance). Further, the two sections of the map are united, and the precision of the map is improved. A system for designating the positions of the loci on the linkage map is proposed. A 0-position is fixed on the map by a locus (necl), which has a good marker gene located centrally in the linkage group. The positions of the other loci are their distances in centimorgans from the 0-position; loci in the direction of the short chromosome arm are assigned positive values and those in the direction of the long arm negative values.
    Original languageEnglish
    JournalHereditas (Print)
    Issue number1
    Pages (from-to)17-26
    Publication statusPublished - 1975


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