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  • 1
    Electronic Resource
    Electronic Resource
    Non-Mendelian and skewed segregation of DNA markers in wide crosses of the bean rust fungus, Uromyces appendiculatus (1996)
    Springer
    Current genetics 29 (1996), S. 159-167 
    Details
    ISSN: 1432-0983
    Keywords: Key words Genetic linkage mapping ; Segregation distortion ; RAPD ; RFLP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The inheritance of DNA markers was investigated in 27 F2 progeny from a single F1 hybrid derived from a wide cross in Uromyces appendiculatus. This cross was unusual because asexual spores were used to fertilize sexual fruiting structures. Sixty percent of the DNA markers failed to segregate according to simple Mendelian ratios. Segregation bias was evident, in that F2 progeny inherited on average 91% of maternal bands and 52% of paternal bands, which deviates significantly from the expected value for each of 75% for dominant markers. Because of these distortions, linkage mapping was not possible with this population. Evaluation of two F1s from a second wide cross, reciprocals obtained by normal fertilization, also showed non-Mendelian inheritance of one of three co-dominant RFLPs and five of six isozyme markers, indicating that the method of crossing was probably not responsible for the abnormal segregation patterns in the first cross. Either genetic incompatibility, similar to that of an interspecific cross, or selection of particular genotypes could explain the genetic anomalies reported here.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002940050031
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Non-Mendelian and skewed segregation of DNA markers in wide crosses of the bean rust fungus,Uromyces appendiculatus (1996)
    Springer
    Current genetics 29 (1996), S. 159-167 
    Details
    ISSN: 1432-0983
    Keywords: Genetic linkage mapping ; Segregation distortion ; RAPD ; RFLP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The inheritance of DNA markers was investigated in 27 F2 progeny from a single F1 hybrid derived from a wide cross inUromyces appendiculatus. This cross was unusual because asexual spores were used to fertilize sexual fruiting structures. Sixty percent of the DNA markers failed to segregate according to simple Mendelian ratios. Segregation bias was evident, in that F2 progeny inherited on average 91 % of maternal bands and 52% of paternal bands, which deviates significantly from the expected value for each of 75% for dominant markers. Because of these distortions, linkage mapping was not possible with this population. Evaluation of two F1s from a second wide cross, reciprocals obtained by normal fertilization, also showed non-Mendelian inheritance of one of three co-dominant RFLPs and five of six isozyme markers, indicating that the method of crossing was probably not responsible for the abnormal segregation patterns in the first cross. Either genetic incompatibility, similar to that of an interspecific cross, or selection of particular genotypes could explain the genetic anomalies reported here.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02221580
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Genetic Change in Host-Parasite Populations (1976)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Phytopathology 14 (1976), S. 177-188 
    Details
    ISSN: 0066-4286
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.py.14.090176.001141
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Genotypic frequencies of phosphoglucose isomerase allozymes in bean rust (Uromyces appendiculatus) populations estimated by densitometry (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 39 (1990), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Phosphoglucose isomerase (PGI) is a dimeric enzyme in germinating urediniospores of Uromyces appendiculatus. Three distinct bands occur in heterozygous isolates after starch gel electrophoresis. Transmission densitometry was used to estimate the frequency of the homozygous slow (S), homozygous fast (F), and heterozygous (H) individuals in mixed preparations of urediniospores. Areas under each band peak were transformed to genotypic frequencies by comparison with standard 1:1 (F:S)and 100% H preparations. Estimated genotypic and allelic frequencies in prepared mixtures were linearly related to the actual frequencies. Correspondence of estimated with actual frequencies was high, generally differing by 10% or less. Three of 10 field collections examined were polymorphic for PGI allozymes, and two of these were apparently in Hardy-Weinberg equilibrium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1990.tb02480.x
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    GENETIC INTERDEPENDENCE OF HOST AND PARASITE IN EPIDEMICS (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 287 (1977), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1977.tb34234.x
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    Paper (German National Licenses)
    Fulltext
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