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  • 1
    Electronic Resource
    Electronic Resource
    The production of dihaploids and tetraploids with combined quantitative resistance to potato cyst nematode (Globodera pallida) and foliage blight (Phytophthora infestans) (1989)
    Springer
    Potato research 32 (1989), S. 425-430 
    Details
    ISSN: 1871-4528
    Keywords: breeding ; unreduced gametes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Dihaploids were produced from tetraploids which had resistance to foliage late blight (P. infestans) and had a range of levels of resistance to white potato cyst nematode (PCN) (G. pallida). Twelve of 33 dihaploids tested had useful levels of both resistances, 11 were resistant to blight alone and seven to PCN alone. There were no significant correlations between the resistances of the parents and the mean resistance of their dihaploids, for either character. There was also no correlation between levels of resistance to blight and to PCN. There were significant differences in mean levels of resistance to blight and to PCN between the tetraploid progenies of two dihaploids which possessed combined resistance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358497
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Breeding for quantitative resistance to potato cyst nematode (Globodera pallida) in tetraploid potatoes using dihaploids and unreduced gametes (1986)
    Springer
    Euphytica 35 (1986), S. 1001-1006 
    Details
    ISSN: 1573-5060
    Keywords: Solanum tuberosum ; dihaploid potatoes ; unreduced gametes ; Globodera pallida ; potato cyst nematode resistance ; breeding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Dihaploids were produced from tetraploids resistant to potato cyst nematode (Globodera pallida (Stone)). High levels of resistance were found in the dihaploids and three were used to produce tetraploid progenies by crossing them with susceptible tetraploid cultivars. One dihaploid, PDH505, produced more highly resistant offspring than the other two, PDHs 417 and 418. The latter gave progenies whose levels of resistance were similar to those obtained from susceptible dihaploids crossed with resistant tetraploids. The differences between the progenies of the resistant dihaploids were probably due to different modes of unreduced gamete formation (PDH505 producing gametes by first division restitution (FDR) and PDHs 417 and 418 by second division restitution (SDR)) although cytological studies would be necessary to confirm this. The methods by which dihaploids could be utilised in a tetraploid potato breeding programme are discussed in relation to the mode of unreduced gamete formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00028610
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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