QTL analysis in recombinant chromosome substitution lines and doubled haploid lines derived from a cross between Hordeum vulgare ssp. vulgare and Hordeum vulgare ssp. spontaneum

Kiyosumi Hori, Kazuhiro Sato, Nami Nankaku, Kazuyoshi Takeda

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    38 Citations (Scopus)

    Abstract

    Recombinant chromosome substitution lines (RCSLs) were developed in BC 3 generation to introduce segments of a wild barley strain 'H602' (Hordeum vulgare ssp. spontaneum) into a barley cultivar 'Haruna Nijo' (H. vulgare ssp. vulgare) genetic background. One hundred thirty four RCSLs were genotyped by 25 SSR and 60 EST markers, which were localized on a linkage map of doubled haploid lines (DHLs) derived from the same cross combination. Graphical genotyping revealed that the observed average substitution ratio of H602 segment (12.9%) agreed with the expected substitution ratio (12.5%), and a minimum set of 19 RCSLs represented the entire H602 genome. Phenotypes of five qualitative and nine quantitative traits were scored in both the RCSLs and DHLs. Five qualitative traits were localized as morphological markers on the linkage map of the DHLs, and these molecular markers were aligned on the respective chromosomal regions in the RCSLs. Simple and composite interval mapping procedures detected a total of 18 and 24 QTLs for nine qualitative traits on the RCSLs and DHLs, respectively. Several QTLs were localized at coincident or very close regions on both linkage maps. In spite of general inferior agronomic performances in wild barley, several H602 QTL alleles showed agronomically positive effects. These RCSLs should contribute to substitution of favorable alleles from wild barley into cultivated barley. These RCSLs are also available as sources of near isogenic lines, with which we can apply advanced genetic analysis methods such as isolation of QTLs and detection of epistatic interactions among QTLs.

    Original languageEnglish
    Pages (from-to)295-311
    Number of pages17
    JournalMolecular Breeding
    Volume16
    Issue number4
    DOIs
    Publication statusPublished - Nov 2005

    Keywords

    • AB-QTL analysis
    • Barley
    • Hordeum vulgare L.
    • QTL
    • Recombinant chromosome substitution lines (RCSLs)

    ASJC Scopus subject areas

    • Biotechnology
    • Molecular Biology
    • Agronomy and Crop Science
    • Genetics
    • Plant Science

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