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  • 1
    Electronic Resource
    Electronic Resource
    Molecular marker assisted genetic analysis of head shattering in six-rowed barley (2000)
    Springer
    Theoretical and applied genetics 101 (2000), S. 203-210 
    Details
    ISSN: 1432-2242
    Keywords: Key words Brittle rachis ; Weak rachis ; QTL ; Spike density ; Peduncle curvature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Head shattering in barley (Hordeum vulgare L.) has two forms; brittle rachis and weak rachis. Brittle rachis is not observed in cultivated barley since all cultivars carry non-brittle alleles at one of the two complementary brittle rachis loci (Btr1;Btr2). Weak rachis causes head shattering in barley cultivars and may be confused with brittle rachis. Brittle rachis has been mapped to the chromosome 3 (3H) short arm while map position(s) of the weak rachis is unknown. Two major and a putative minor QTL for head shattering were mapped using the Steptoe × Morex doubled haploid line population. The largest QTL, designated Hst-3, located on the chromosome 3 (3H) centromeric region, is associated with a major yield QTL. The Steptoe Hst-3 region, when transferred into Morex, resulted in a substantial decrease in head shattering. High-resolution mapping of Hst-3 was achieved using isogenic lines. Brittle rachis was mapped with molecular markers and shown to be located in a different position from that of Hst-3. The second major QTL, designated Hst-2 S, is located on chromosome 2 S. This locus is associated with an environmentally sensitive yield QTL.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051470
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  • 2
    Electronic Resource
    Electronic Resource
    Mapping quantitative and qualitative disease resistance genes in a doubled haploid population of barley (Hordeum vulgare) (2000)
    Springer
    Theoretical and applied genetics 101 (2000), S. 580-589 
    Details
    ISSN: 1432-2242
    Keywords: Key words Barley ; Genome mapping ; Stripe rust ; Leaf rust ; BYDV ; Resistance Gene Analog Polymorphism ; QTL
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Stripe rust, leaf rust, and Barley Yellow Dwarf Virus (BYDV) are important diseases of barley (Hordeum vulgare L). Using 94 doubled-haploid lines (DH) from the cross of Shyri x Galena, multiple disease phenotype datasets, and a 99-marker linkage map, we determined the number, genome location, and effects of genes conferring resistance to these diseases. We also mapped Resistance Gene Analog Polymorphism (RGAP) loci, based on degenerate motifs of cloned disease resistance genes, in the same population. Leaf rust resistance was determined by a single gene on chromosome 1 (7H). QTLs on chromosomes 2 (2H), 3 (3H), 5 (1H), and 6 (6H) were the principal determinants of resistance to stripe rust. Two- locus QTL interactions were significant determinants of resistance to this disease. Resistance to the MAV and PAV serotypes of BYDV was determined by coincident QTLs on chromosomes 1 (7H), 4 (4H), and 5 (1H). QTL interactions were not significant for BYDV resistance. The associations of molecular markers with qualitative and quantitative disease resistance loci will be a useful information for marker-assisted selection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051519
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Quantitative trait locus effects and environmental interaction in a sample of North American barley germ plasm (1993)
    Springer
    Theoretical and applied genetics 87 (1993), S. 392-401 
    Details
    ISSN: 1432-2242
    Keywords: QTL ; RFLP mapping ; marker-assisted selection ; Barley
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Quantitative trait locus (QTL) and QTL x environment (E) interaction effects for agronomic and malting quality traits were measured using a 123-point linkage map and multi-environment phenotype data from an F1-derived doubled haploid population of barley (Hordeum vulgare). The QTL × E interactions were due to differences in magnitude of QTL effects. Highly significant QTL effects were found for all traits at multiple sites in the genome. Yield QTL peaks and support intervals often coincided with plant height and lodging QTL peaks and support intervals. QTL were detected in the vicinity of a previously mapped Mendelian maturity locus and known function probes forα- andβ-amylase genes. The average map density (9.6 cM) should be adequate for molecular marker-assisted selection, particularly since there were few cases of alternative favorable alleles for different traits mapping to the same or adjacent intervals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01184929
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    Paper (German National Licenses)
    Fulltext
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