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  • 1
    Electronic Resource
    Electronic Resource
    Variation in resistance level of potato genotypes and virulence level of potato cyst nematode populations (1992)
    Springer
    Euphytica 62 (1992), S. 135-143 
    Details
    ISSN: 1573-5060
    Keywords: pathotype ; virulence group ; partial resistance ; Globodera rostochiensis ; Globodera pallida ; Solanum tuberosum ; potato ; potato cyst nematode
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In two experiments, using different testing methods, the number of newly formed cysts was determined on nine potato genotypes with resistance from various sources. Ten potato cyst nematode (PCN) populations were used in these experiments. Rank correlation between numbers of cysts over potato genotype-PCN population combinations for both experiments was high (rs = 0.90). Dendrograms for PCN populations and potato genotypes were constructed, based on a simultaneous hierarchical clustering procedure for potato genotype-PCN population interaction terms. Several virulence groups could be identified within Globodera rostochiensis as well as within G. pallida. Host genotypes, derived from the same sources of resistance, were clustered in different resistance groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00037939
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  • 2
    Electronic Resource
    Electronic Resource
    Analysing genotype by environment interaction in Dutch potato variety trials using factorial regression (1995)
    Springer
    Euphytica 82 (1995), S. 149-155 
    Details
    ISSN: 1573-5060
    Keywords: AMMI ; biadditive model ; factorial regression ; multiplicative interaction ; potato ; variety trials ; Solanum tuberosum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Genotype by environment interaction was investigated for yield data from the official Dutch Variety List trials for potato. The data set included 64 genotypes by 26 environments, where environments consisted of year by soil type combinations. Factorial regression models incorporating genotypic and environmental covariates in the interaction were used to analyse the data. The merits of factorial regression models were compared with those of biadditive models. Factorial regression models and biadditive models described comparable amounts of interaction, but factorial regression models provided a better basis for biological interpretation of the interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027061
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of hunger and prey traces on the search activity of the predatory beetle Notiophilus biguttatus (1989)
    Springer
    Entomologia experimentalis et applicata 51 (1989), S. 87-95 
    Details
    ISSN: 1570-7458
    Keywords: prey traces ; predator hunger ; search activity ; predation ; Carabidae ; Collembola
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Cet article décrit l'influence de trois paramètres liés à la densité des proies sur le comportement locomoteur de N. biguttatus. Les trois paramètres testés expérimentalement ont été: les traces laissées dans l'habitat par une proie invisible, le contenu de l'estomac, et la ration alimentaire quotidienne du carabe. Les résultats indiquent que le conditionnement de l'habitat par les traces augmente le nombre de périodes d'activité, mais diminue en même temps leur durée, si bien que la durée totale reste constante. La réplétion de l'estomac réduit l'effet des traces (ou conditionnement) de l'habitat. L'analyse de la probabilité maximale a montré que le modèle éthologique peut être décrit au mieux comme un mélange de deux types d'activités, l'une d'entre elles correspondant vraisemblablement au comportement de prospection. Il est ainsi possible de quantifier les résultats expérimentaux en termes de fréquence du comportement de prospection.
    Notes: Abstract The locomotory behaviour of the predatory beetle Notiophilus biguttatus F. was examined as a function of three experimental factors: prey traces left in the environment, gut contents and daily food ration. Prey traces led to an increase in the frequency of runs and stops. The size of this effect depended on gut contents. Maximum-likelihood analysis showed that the activity pattern could be described as a mixture of two kinds of activity, one of them presumably reflecting search behaviour. This enabled a quantification of the experimental results in terms of the frequency with which the beetle exibited search behaviour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00343447
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  • 4
    Electronic Resource
    Electronic Resource
    Analysing genotype by environment interaction in Dutch potato variety trials using factorial regression (1995)
    Springer
    Euphytica 84 (1995), S. 23-29 
    Details
    ISSN: 1573-5060
    Keywords: AMMI ; biadditive model ; factorial regression ; multiplicative interaction ; potato ; variety trials ; Solanum tuberosum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Genotype by environment interaction was investigated for yield data from the official Dutch Variety List trials for potato. The data set included 64 genotypes by 26 environments, where environments consisted of year by soil type combinations. Factorial regression models incorporating genotypic and environmental covariates in the interaction were used to analyse the data. The merits of factorial regression models were compared with those of biadditive models. Factorial regression models and biadditive models described comparable amounts of interaction, but factorial regression models provided a better basis for biological interpreration of the interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01677553
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