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  • 1985-1989  (1,347)
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  • 1
    ISSN: 1432-2242
    Keywords: White spruce ; Picea glauca ; Heritability ; Genetic gains
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The paper presents results of a growth chamber progeny test of selected phenotypically superior trees from two white spruce (Picea glauca (Moench.) Voss.) populations in central Newfoundland, Canada. On the basis of heritability of 11 juvenile characters the superior trees have been demonstrated to be suitable as a base population for continued advanced generation breeding. Family selection would produce good genetic gains in the first generation but these can be enhanced considerably by selection of best individuals within the best families for clonal propagation in the second generation or propagation by seed in the second and subsequent generations.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 69 (1985), S. 235-240 
    ISSN: 1432-2242
    Keywords: Protoplast culture ; Lycopersicon esculentum ; Tomato ; Plant regeneration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary An efficient and reliable protocol for tomato protoplast isolation, culture, and plant regeneration has been developed. Fourteen diverse cultivars were tested. Fertile plants were regenerated from all 14 cultivars without any modification in the protocol. Plating efficiency (percentage of the protoplasts that formed minicalli) of up to 50% was achieved. Those mini-calli rapidly regenerated shoots at high frequencies. Regenerated shoots can be easily rooted on a basal medium with the appropriate auxin, and have been set to soil within two months after the isolation of the protoplasts.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 69 (1985), S. 252-252 
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 69 (1985), S. 262-262 
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-2242
    Keywords: Zea mays L. ; Interpopulation cross ; Half-sib reciprocal recurrent selection ; Full-sib reciprocal recurrent selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The nature and magnitude of variability in the interpopulation cross of ‘Mezcla Amarillo Selection’ (MAS), an introduction from CIMMYT, Mexico, and ‘J607’, a population developed in India using indigenous, American, and Yugoslavian germplasm, were studied. Interpopulation progenies developed by following the North Carolina Design I were evaluated at two locations. The additive genetic variance component in interpopulation cross,σ A(12) 2 , and in one population assuming the other population as tester,σ A12 2 andσ A21 2 were significant for all the traits evaluated, namely ear length, ear girth, kernel rows and days to silk, with one exception. For kernel rows, the dominance variance component,σ A(12) 2 , was also significant but it was smaller thanσ A(12) 2 . The variance component due to dominance X location interaction,σ DL(12) 2 , was significant for all traits except kernel rows. In the case of ear length and ear girth,σ DL(12) 2 was greater than the other components.σ AL(12) 2 ,σ AL12 2 andσ AL21 2 were not significant for any trait. Expected genetic advance indicated a superiority of half-sib reciprocal recurrent selection over full-sib reciprocal recurrent selection.
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  • 6
    ISSN: 1432-2242
    Keywords: Intrachromosomal mapping ; Nucleolar organiser region ; Triticum aestivum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Restriction enzyme digestion of the ribosomal RNA genes of the nucleolar organisers of wheat has revealed fragment length polymorphisms for the nucleolar organiser on chromosome 1B and the nucleolar organiser on 6B. Variation between genotypes for these regions has also been demonstrated. This variation has been exploited to determine the recombination frequency between the physically defined nucleolar organiser on 1B (designatedNor1) and other markers; two loci,Glu-B1 andGli-B1 which code for endosperm storage proteins andRf3, a locus restoring fertility to male sterility conditioned byT. timopheevi cytoplasm.Gli-B1 andRf3 were located on the short-arm satellite but recombine with the nucleolar organiser giving a gene order ofNor1 — Rf3 — Gli-B1. Glu-B1 is located on the long arm of 1B but shows relatively little recombination withNor1, which is, in physical distance, distal on the short arm. This illustrates the discrepancy between map distance and physical distance on wheat chromosomes due to the distal localisation of chiasmata. The recombination betweenNor1 andRf3 indicates that, contrary to previous suggestions, fertility restoration is not a property of the nucleolar organiser but of a separate locus.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 69 (1985), S. 292-292 
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 69 (1985), S. 625-629 
    ISSN: 1432-2242
    Keywords: Drosophila melanogaster ; Esterase 6 ; Mating behavior ; Population genetics ; Quantitative genetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A modified diallel cross is used to estimate effects of alleles at the esterase 6 locus, relative to strain and environmental variance, in Drosophila melanogaster. Three strains homozygous for Est 6 s and three homozygous for Est 6 F were crossed in all 36 combinations. Male progeny were scored for mating speed, copula duration and esterase 6 enzyme activity, and all progeny for developmental time. These alleles show a significant additive effect on mating speed, but not on the other traits. Copula duration, developmental time and enzyme activity show additive strain genetic variance. Enzyme activity and developmental time also have maternal or X-chromosome strain variance, and these two traits are significantly correlated. This modified diallel method is generally useful because it permits the partition of trait variance into additive and dominant locus, background genetic and environmental components.
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  • 9
    ISSN: 1432-2242
    Keywords: Evolution of recombination ; Dependence of recombination on environment ; Constant and variable rf-strategies ; Mean fitness ; Selection of rec-genes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The recombination frequency (rf) is known to be dependent not only on genetic background, but on the environment as well. In our numerical experiments we examine the role of the dependence of recombination on environment in the evolution of the genetic system. Variable rf-strategies, ensuring mean fitnesses greater than the optimum constant rf*-level, exist in both cyclical and stochastic environments. The conclusion that environment dependent recombination is evolutionary advantageous can be shown to be valid when variation in the frequency of recombination modifiers rather than mean fitness (which implies the concept of group selection) is used as a criterion for strategy comparisons. In this case, an evolutionary advantageous type of variable rf-strategies is the one ensuring restricted genetic variability dispersion in an optimal environment and an increase in released variation with the deterioration of environmental conditions. Another important result is that, taking into account the dependence of recombination on environment, it is possible to account for the maintenance of a higher level of population recombination than that predicted by models with the constant rf-level. On the whole, the data obtained indicate that the direct influence of external factors upon the rf-value could have been a significant factor in the evolution of the genetic system.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1432-2242
    Keywords: Indirect selection ; Temperature ; Correlated responses ; Reproductive isolation ; Fitness components ; Enzyme activities ; Drosophila melanogaster
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Short-term indirect selection in Drosophila melanogaster for heat-sensitivity and heat resistance resulted in two strains, one heat sensitive and another heat resistant, and correlated responses were found for the rate of heat shock protein synthesis, behavioral patterns (asymmetrical sexual isolation) and fitness components (fecundity, fertility, viability, developmental time), as well as for several enzyme activities (MDH, G-6-PDH, ADH, ACHE). These responses associated with temperature selection may reflect the effects of differential inbreeding depression caused by homozygosity of temperature sensitive mutations with different pleiotropic effects. Selection even of a very short duration can induce significant adaptive and evolutionary changes.
    Type of Medium: Electronic Resource
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