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  • 1
    Electronic Resource
    Electronic Resource
    Host resistance and pathogen virulence across a plant hybrid zone (1999)
    Springer
    Oecologia 121 (1999), S. 339-347 
    Details
    ISSN: 1432-1939
    Keywords: Key words Flax rust ; Linum ; Melampsora ; Coevolution ; Hybrid zone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Hybridization between locally adapted plant populations has been postulated to have significant evolutionary consequences, and, in particular, may influence host-pathogen interactions with respect to resistance and virulence structure. This study investigated patterns of resistance and virulence in a hybrid zone between ”bog” and ”hill” ecotypes of the native Australian flax, Linum marginale, where the host is subject to attack by the rust pathogen, Melampsora lini. Analysis of the resistance structure of adjoining bog, hill and hybrid populations found that bog plants were generally susceptible to pathogen isolates taken from all these sites, but that hybrids exhibited resistance levels similar to the more resistant hill plants. Similarly, the virulence structure of rust isolates collected from the hybrid population was more similar to that of the hill isolates than the bog. Controlled crosses between bog and hill plants showed that crosses in one direction (bog females×hill males) were much more successful than the other. A multi-year reciprocal transplant study further indicated that bog plants had significantly higher survivorship than hill plants, regardless of site. It is suggested that likelihood of differential gene flow and survivorship for bog and hill plants may at least partially explain the maintenance of a relatively narrow hybrid zone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004420050937
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Phenotypic and genetic patterns of resistance to the pathogen Phakopsora pachyrhizi in populations of Glycine canescens (1987)
    Springer
    Oecologia 73 (1987), S. 257-267 
    Details
    ISSN: 1432-1939
    Keywords: Glycine canescens ; Phakopsora pachyrhizi ; Plant pathology ; Population genetics ; Pathogen resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Phenotypic patterns of resistance to nine races of the pathogen Phakopsora pachyrhizi (soybean rust) in two natural populations of Glycine canescens were determined. In both populations there was considerable variability both within and between different host lines in their resistance or susceptibility to the nine different pathogen races. The genetic basis of these patterns of resistance was analyzed through an extensive series of crosses. In both host populations resistance was conditioned by single dominant genes with major phenotypic effects. One, two or three such genes were present in each host line. Using the principles of the gene-for-gene hypothesis, knowledge about the number of resistance genes present in each host line and by cross comparison of the phenotypic patterns of disease resistance detected in each line, estimates were made of the number of resistance genes or alleles present in each population of G. canescens. The two populations contained a minimum of 10 and 12 resistance genes. The relevance of these results to agriculture is discussed briefly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377516
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Genetic structure of Glycine canescens, a perennial relative of soybean (1990)
    Springer
    Theoretical and applied genetics 79 (1990), S. 729-736 
    Details
    ISSN: 1432-2242
    Keywords: Glycine canescens ; Allozyme variation ; Geographic distribution ; Collection strategies ; Core collection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Allozyme variation as detected by starch gel electrophoresis was used to assess the extent and spatial organization of genetic variation across the entire range of Glycine canescens sensu lato. Eleven enzyme systems were assayed in 116 accessions of this taxon and 102 alleles were detected at a total of 31 loci. Eighty-one percent of loci were polymorphic. Most of this variation occurred between and very little within accessions. Three major groupings were detected. These groupings (groups 1, 2, and 3) also differed with respect to mean seed size and their geographic distribution. A further ten accessions stood out from these distinct groups. These accessions were most closely related to group 3 but were variable among themselves. In general, they were collected from highly dissected terrain, often in the remote interior of the continent. A final group of 18 problematic accessions (group X), originally tentatively identified as G. canescens on morphological grounds, was shown to be isozymically distinct from this species and was reclassified as one form of the polytypic species G. clandestina.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224237
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A set of differential Glycine hosts for the identification of races of Phakopsora pachyrhizi Syd. (1984)
    Springer
    Euphytica 33 (1984), S. 891-896 
    Details
    ISSN: 1573-5060
    Keywords: Glycine max ; soybean ; Glycine canescens ; Glycine clandestina ; Glycine tabacina ; Glycine tomentella ; Phakopsora pachyrhizi ; Soybean leaf rust ; disease resistance ; races ; differential set ; host-pathogen interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Variation in the responses of a wide range of accessions of four native Australian species of Glycine (viz. G. canescens, G. clandestina, G. tabacina and G. tomentella) to infection by eight Australian isolates of Phakopsora pachyrhizi was analyzed. Differences in the infection type responses of the various wild Glycine species were sufficient to recognize six different virulence combinations amongst the eight pathogen isolates. A set of differential hosts useful in the identification of different races of the pathogen is presented to facilitate further examination of the virulence structure of the pathogen population.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00021917
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    Paper (German National Licenses)
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