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  • Barley doubled haploids  (1)
  • Intrachromosomal mapping  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Intrachromosomal mapping of crossability genes in wheat (Triticum aestivum) (1985)
    Springer
    Theoretical and applied genetics 70 (1985), S. 309-314 
    Details
    ISSN: 1432-2242
    Keywords: Crossability genes ; Wheat ; Intrachromosomal mapping ; Rye ; Hordeum bulbosum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Intrachromosomal mapping studies were used to locate the positions of the genes Kr1 and Kr2, which control the crossability of wheat with Hordeum bulbosum, on chromosomes 5B and 5A, respectively. The location of Kr1 was established using the telocentric mapping technique and found to be on the long arm of chromosome 5B, distal to the centromere with a mean recombination frequency of 44.8±3.28%. Kr2 was located on the long arm of chromosome 5A by linkage with the major gene markers Vrn1, controlling vernalization requirement, and q, controlling ear morphology. Kr2 is closely linked to Vrn1, with a mean recombination frequency of 4.8±4.66%, and is distal to q with a mean recombination frequency of 38.1±10.60%. The similar locations of Kr1 and Kr2 on homoeologous chromosomes suggest that these two loci are homoeoallelic. Significant correlations between Hordeum bulbosum and rye crossability confirmed that Kr1 and Kr2 control the crossability of wheat with both species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00304917
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Tests for the presence of gametoclonal variation in barley and wheat doubled haploids produced using the Hordeum bulbosum system (1988)
    Springer
    Theoretical and applied genetics 75 (1988), S. 509-513 
    Details
    ISSN: 1432-2242
    Keywords: Gametoclonal variation ; Barley doubled haploids ; Wheat doubled haploids ; Hordeum bulbosum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary To investigate whether the Hordeum bulbosum system of doubled haploid production generates gametoclonal variation, populations of second generation doubled haploid lines were developed from first generation doubled haploid lines of two barley varieties and three wheat genotypes. In barley, no variation between doubled haploids from doubled haploids was detected for a range of quantitative characters, suggesting the absence of any gametoclonal effects. However, the original selfed-seed stocks were shown to contain cryptic allelic variation for some of the characters investigated. In wheat, gametoclonal variation was detected for ear emergence time, plant height and yield, and its components for two out of the three genotypes investigated. The type and range of variation was similar to that reported from studies of somaclonal variation from immature embryos and gametoclonal variation from anther culture. Generally, the effects appeared to reduce the yield performance of individual lines. The difference in response between the two species and the consequences for the use of the doubled haploid system in breeding programmes are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00276758
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    Paper (German National Licenses)
    Fulltext
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