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  • 1
    ISSN: 1871-4528
    Keywords: Nematodenresistenz ; Sortenkreuzungen ; Spaltungszahlen ; Genetik
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Summary The inheritance of resistance toGlobodera rostochiensis pathotype Ro1 was studied in progenies of 10 selected cultivars which had resistance to different pathotypes, stemming from several wild species. Progenies of all the cultivars were produced by crossing with a susceptible cultivar, and several random samples from each combination, usually progeny from a single berry, were tested for their resistance to pathotype Ro1. The cultivars could be separated into genotypic groups, according to the proportion of resistant progeny in each combination. Cultivars which did not differ significantly in the split of resistant and susceptible progenies, but were clearly different from other groups, were put in the same group. The number of groups which could be differentiated was not consistent with the theoretically possible genotype, simplex ... quadruplex, arising from the inheritance of the gene H1. Greater genetic variation could be detected involving more than 4 genotypic groups. The results suggest the existence of another genetical mechanism. The number of groups and their reproducibility requires further investigation. It will therefore be necessary to test several different random samples to characterise a single combination.
    Notes: Zusammenfassung 10 nematodenresistente Sorten wurden mit einem anfälligen Elter gekreuzt und die daraus erzeugten Nachkommenschaften auf Resistenz gegen Pathotyp Ro 1 des Kartoffelnematoden geprüft. Die Prüfung erfolgte an Sämlingen und Klonen, die sich aus mehreren Stichproben einer Kombination, einschliesslich der Prüfung von Nachkommen aus Einzelbeeren, zusammensetzten. Entsprechend dem Anteil resistenter Nachkommen in den einzelnen Kombinationen können die Sorten in genotypische Gruppen eingeteilt werden. Im Gegensatz zu den simplex ... quadruplex Genotypen der Gen H1-Vererbung konnte eine höhere genetische Variabilität nachgewiesen werden. Eine Beurteilung der Anzahl der genetischen Faktoren, die die Vererbung der Resistenz gegen Pathotyp Ro 1 beeinflussen, kann erst nach Prüfung weiterer Kreuzungsnachkommenschaften erfolgen.
    Type of Medium: Electronic Resource
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