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  • 1
    Electronic Resource
    Electronic Resource
    Inheritance of resistance to early blight disease in a diploid potato population (2001)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 120 (2001), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Early blight disease, caused by Alternaria solani Sorauer, is a serious disease of potato foliage and tubers that occurs in most potato-growing regions world-wide. Developing new potato cultivars with resistance to early blight may reduce losses in the field and in storage, and lessen the need for fungicide applications. A total of 280 clones, derived from 72 maternal half-sib families from a diploid random-mated hybrid population of Solarium phureja×Solarium stenotomum were examined for resistance to early blight. The clones that were evaluated in a replicated field trial for 2 years in Pennsylvania, USA, had similar early blight intensity both years. Significant differences were found among families, within families and for the interaction of years × within families. Broad-sense heritability for resistance, measured as area under the disease progress curve (AUDPC), was estimated as 0.73, with a 95% confidence interval of 0.65-0.78, and narrow-sense heritability was estimated as 0.61 ± 0.29 (P = 0.05). The correlation of AUDPC for early blight between years was 0.57 (P 〈 0.0001). These results suggest that this diploid population is worthy of use in breeding for early blight resistance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1439-0523.2001.00565.x
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  • 2
    Electronic Resource
    Electronic Resource
    Heritability of resistance to foliar late blight in a diploid hybrid potato population of Solanum phureja×Solanum stenotomum (1999)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 118 (1999), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The emergence of new races of Phytophthora infestans has necessitated the search for additional sources of potato germplasm with resistance to late blight. This study examined 281 clones, derived from 72 families of a diploid random-mated hybrid population of Solanum phureja×Solanum stenotomum. The clones were evaluated in a replicated field trial for 2 years with the control cultivar ‘Atlantic’ in Pennsylvania, USA. The P. infestans US-8 A2 mating type culture was used to inoculate spreader rows of susceptible S. tuberosum cv.‘Russet Burbank’. Percent defoliation caused by the late blight fungus was estimated visually in each plot three times near the end of the growing season. Area under the disease progress curve (AUDPC) was estimated and showed that late blight was more severe in 1997 than in 1996. Genetic differences among clones and significant, but small, clone–environment interaction were detected for AUDPC. Broad-sense and narrow-sense heritability estimates, over years, were 0.79 ± 0.05 (P = 0.05) and 0.78 ± 0.29, respectively. Seventy-five percent of the diploid clones had a significantly lower mean AUDPC than Atlantic. These results support the idea that this diploid population is worthy of use in breeding for late blight resistance in tetraploid potato cultivars.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1439-0523.1999.00394.x
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  • 3
    Electronic Resource
    Electronic Resource
    Late blight resistance in a diploid full-sib potato family (2004)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 123 (2004), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Late blight, caused by Phytophthora infestans (Mont.) de Bary, is the most destructive disease of potato worldwide. As this pathogen can rapidly overcome major race-specific resistance genes, identifying the basis for enhanced quantitative resistance has become a crucial element for implementing advanced breeding strategies. A population of 230 full-sib progeny derived from a cross between two diploid hybrid Solanum phureja × S. stenotomum clones was evaluated for foliage resistance against late blight in replicated trials at multiple locations in Pennsylvania between 1999 and 2002. In field experiments, plants were evaluated visually for per cent defoliation, and area under the disease progress curve (AUDPC) was determined. The two parents and three control cultivars (‘Atlantic’, ‘Kennebec’ and ‘Katahdin’) were included in all trials. In all three experiments, the presence of a significant number of clones exhibiting transgressive segregation were observed. There were significant differences among environments as well as among clones, and the clone × environment interaction was also significant. Stability analysis revealed that 37 clones made a significant contribution to the overall environment × clone interaction. Broad-sense heritability for resistance, measured as AUDPC, was estimated as 0.67. The overall results indicate the presence in this potato family of a high level of field resistance against late blight. This segregating diploid family appears to be a good candidate for quantitative trait loci mapping to identify and characterize the genetic components of partial late blight resistance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.2004.00999.x
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  • 4
    Electronic Resource
    Electronic Resource
    Sublethal Effects of Neurotoxic Insecticides on Insect Behavior (1988)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Entomology 33 (1988), S. 149-168 
    Details
    ISSN: 0066-4170
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.en.33.010188.001053
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  • 5
    Electronic Resource
    Electronic Resource
    Market centers and retail location: Theory and applications - By Brian J. L. Berry and John B. Parr, with Bart J. Epstein, Avijit Ghosh, and Robert H. T. Smith. Englewood Cliffs, NJ: Prentice Hall. 1988, 42.00, 230 pages
    Amsterdam : Elsevier
    Computers, Environment and Urban Systems 13 (1989), S. 51-54 
    Details
    ISSN: 0198-9715
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Architecture, Civil Engineering, Surveying
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0198-9715(89)90009-4
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  • 6
    Electronic Resource
    Electronic Resource
    Sensory control of mating in the blue gourami, Trichogaster trichopterus (pisces, belontiidae)
    Amsterdam : Elsevier
    Behavioral Biology 22 (1978), S. 92-103 
    Details
    ISSN: 0091-6773
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Psychology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0091-6773(78)92079-5
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  • 7
    Electronic Resource
    Electronic Resource
    Introduction to the special issue The regional and urban effects of high-speed trains (1997)
    Springer
    The annals of regional science 31 (1997), S. 1-20 
    Details
    ISSN: 1432-0592
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geography , Economics
    Notes: Abstract. High-speed trains could be used to solve two different accessibility problems. In the first case, where a point to point link is dominant, they are a potential substitute for air travelling. In the second case it links together many cities and, hence, creates a new type of region or corridor with a high interregional accessibility. One important hypothesis for the discussion in this paper is the degree to which cities that are linked together into a band of cities by means of a high-speed train connection are transformed to an extended functional region or in other words an integrated corridor economy. This paper particularly examines economic integration in a corridor economy in the short, medium and long term. In considering the short-term perspective we discuss not only the integration of goods and service markets but also the integration of labour markets and markets for shopping, private services and leisure activities. The discussion of the medium term perspective is concentrated on the relocation of households and firms within a high-speed train corridor. To study the long-term integration effects of a high-speed train corridor we maintain that the analysis must be conducted using a genuinely dynamic model for the specialisation of production and, hence, for trade with and transport of goods and services and consequently transport of people.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001680050036
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  • 8
    Electronic Resource
    Electronic Resource
    Monitoring insecticide resistance with insect pheromones (1986)
    Springer
    Cellular and molecular life sciences 42 (1986), S. 1293-1295 
    Details
    ISSN: 1420-9071
    Keywords: Pectinophora gossypiella ; pink bollworm moth ; insecticide resistance ; pheromones ; sticky traps ; permethrin ; fenvalerate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A novel pheromone-baited sticky trap laced with insecticides proved to be a simple and effective means of monitoring insecticide resistance in the pink bollworm moth. Adult males from fields treated frequently with pyrethroid insecticides showed up to 20-fold resistance to permethrin and up to 14.5-fold resistance to fenvalerate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01946429
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  • 9
    Electronic Resource
    Electronic Resource
    Potential for evolution of resistance to pheromones: Interindividual and interpopulational variation in chemical communication system of pink bollworm moth (1984)
    Springer
    Journal of chemical ecology 10 (1984), S. 1551-1565 
    Details
    ISSN: 1573-1561
    Keywords: Resistance ; mating disruption ; sex pheromone ; (Z,Z)-7 ; 11-hexadecadienyl acetate ; (Z,E)-7 ; 11-hexadecadienyl acetate ; Lepidoptera ; Gelechiidae ; pink bollworm ; Pectinophora gossypiella ; cotton ; pheromone collection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract After an extensive examination of the release rates and blend ratios of pheromonal components emitted by field-collected femalePectinophora gossypiella (Saunders), we find no evidence of resistance to pheromones applied to cotton fields to disrupt mating. Females from fields with 3–5 years of exposure to disruptant pheromones as well as those from fields with only minimal exposure to disruptant pheromones emitted (Z,Z)-7,11-hexadecadienyl acetate at a rate of ca. 0.1 ng/min and (Z,E)7,11-hexadecadienyl acetate at ca. 0.06 ng/min. The ratio of pheromonal components was much less variable than the measured emission rate and was centered about a 61:39Z, Z to Z,E ratio. In contrast to the blend ratio emitted by females, the composition of the pheromonal blend used in monitoring populations and disrupting mating is centered about 50:50 Z,Z to Z.E. In general there was a remarkable consistency in the release rate and blend ratio among populations of females throughout southern California and those from a laboratory colony. It would appear that, although resistance to theP. gossypiella pheromone is still a very real possibility when it is used heavily in pest management as a mating disruptant, there are current agricultural practices and conditions which would hinder its development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00988424
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  • 10
    Electronic Resource
    Electronic Resource
    Interpopulational variation in emitted pheromone blend of cabbage looper moth,Trichoplusia ni (1990)
    Springer
    Journal of chemical ecology 16 (1990), S. 509-519 
    Details
    ISSN: 1573-1561
    Keywords: Sex pheromone ; (Z)-7-dodecenyl acetate ; (Z)-5-dodecenyl acetate ; 11-dodecenyl acetate ; dodecyl acetate ; (Z)-9-tetradecenyl acetate ; (Z)-7-tetradecenyl acetate ; Lepidoptera ; Noctuidae ; Trichoplusia ni
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Female cabbage looper moths,Trichoplusia ni, from laboratory colonies initiated from three locations across the United States emitted similar quantities and blend ratios of the six known pheromone components. In contrast, females from a long-established laboratory colony emitted a greater proportion of four of the five minor components relative to the major component, (Z)-7-dodecenyl acetate; only the relative proportion of 11-dodecenyl acetate was similar in all of the populations sampled. Females from this population emitted (Z)-7-dodecenyl acetate at a rate similar to that from females from field-collected colonies. Within each population there were highly significant correlations among the quantities of pheromone components of similar molecular weights. Correlations between components of different molecular weights were not as great, but often were significant. Similarities of blend ratios among field populations may indicate that the chemical signal in this species is conservative. The difference of the blend ratios in our laboratory population from the other populations may indicate a decrease in the intensity of selection pressure that usually would maintain these values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01021782
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