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  • 1
    Electronic Resource
    Electronic Resource
    Production of Homomatromorphs through Pollen Treatment in Pisum sativum L. (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 102 (1989), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The occurrence of homozygous matromorphic progenis in Pisum sativum L. has, been assessed by using heterozygous female parents in intervarietal and intergeneric crosses. The pollen was subjected to three treatments, i.e. prickle pollination (delayed), gamma irradiation and giibberellic acid (GA3) application, The genetic status of the induced matromorphic progeny was determined by using, multiple gene markers. The frequency or occurrence of homomatromorphs was 3 to 7 per cent, which needs to be increased by pod, ovule or embryo culture, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1989.tb00332.x
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  • 2
    Electronic Resource
    Electronic Resource
    Drag reduction by collapsed and extended polyelectrolytes (1975)
    [s.l.] : Nature Publishing Group
    Nature 253 (1975), S. 109-110 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A commercial PAMH polymer, B1110(Betz Laboratories), M = 15 x 106 was used. This has an intrinsic viscosity, [rj] = (2,300, 2,550, 6,000, 16,000, 52,000) cm3 g-1 in (1.0, 0.1, 0.01, 0.001, 0.0) M NaCl solutions respectively. The radius of gyration of B1110 in 1.0 M NaCl was 315 nm; in dilute ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/253109a0
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  • 3
    Electronic Resource
    Electronic Resource
    Conformational effects in drag reduction by polymers (1976)
    [s.l.] : Nature Publishing Group
    Nature 262 (1976), S. 46-47 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It should be recalled5 that drag reduction by dilute polymer solutions in turbulent pipe flow is bounded between two universal asymptotes, that is, the Prandtl-Karman law and the maximum drag reduction aysmptote, that envelop a 'polymeric' regime in which the observed friction factor relations are ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/262046a0
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  • 4
    Electronic Resource
    Electronic Resource
    Linear and non-linear regression analysis of genotype X environment interactions in pearl millet (1988)
    Springer
    Theoretical and applied genetics 75 (1988), S. 736-740 
    Details
    ISSN: 1432-2242
    Keywords: Pennisetum typhoides (Burm.) S. & H ; Pearl milet ; Linear and non-linear regression analysis ; Genotype X environment interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Regression analysis was computed on the grain yield of 15 single cross F1 hybrids of pearl millet (Pennisetum typhoides (Burm.) S. & H.) evaluated in 20 environments at 19 sites in India to assess the nature of genotype X environment interactions. Linear, quadratic, cubic, twoand three-intersecting straight line models were examined for fit. The interactions of six hybrids viz. MH 110, MH 113, MH 114, MH 115, MH 120 and MBH 110 were explained by the linear regression model. The response of the remaining nine hybrids was largely non-linear. The two and three-intersecting straight line models fit better than the quadratic and cubic models and explained non-linearity of response. The two-intersecting straight line models fit for 6 hybrids MH 106, MH 107, MH 112, MH 116, MH 117 and BJ 104. The response of MH 109 was best explained by a three-intersecting straight line model, but there still existed a significant remainder variation. The truncation of environmental range by assuming moving division points was more efficient than the fixed division points for the segmental regression models. The stability of hybrid varieties on the best fitting model has been discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00265597
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  • 5
    Electronic Resource
    Electronic Resource
    The genetical basis of hybrid vigour in a highly heterotic cross of Nicotiana tabacum (1994)
    Springer
    Theoretical and applied genetics 89 (1994), S. 1027-1031 
    Details
    ISSN: 1432-2242
    Keywords: Basic generations ; Epistasis ; Maternal effects ; Recombinant inbreds ; Triple test cross
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The genetical control of F1 heterosis, observed in a cross of desirable Nicotiana tabacum varieties, was investigated by analysing the data of the basic generations, triple test cross-families and random samples of doubled haploids (DH) and single-seed descent (SSD) lines. Analyses of the first-degree statistics revealed a complex control underlying the genetic variation, including the presence of epistasis, linkage, maternal effects and their interactions, in addition to the additive and dominance effects of the genes segregating in the cross. These analyses identified gene dispersion, directional dominance, and duplicate epistasis, as the main causes of heterosis. The triple test-cross analysis also confirmed the presence of non-allelic interactions and indicated that the dominance ratio, although inflated by epistasis, is consistently partial for all the traits. The extent of transgression in the recombinant inbred lines finally established unequivocally that, as in numerous other crosses, gene dispersion and unidirectional, but partial, dominance are the true causes of heterosis in this cross too.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224534
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  • 6
    Electronic Resource
    Electronic Resource
    The identification of duplicate accessions within a rice germplasm collection using RAPD analysis (1995)
    Springer
    Theoretical and applied genetics 90 (1995), S. 1049-1055 
    Details
    ISSN: 1432-2242
    Keywords: Oryza sativa ; Rice ; Genetic resources ; RAPD ; Molecular markers ; Cluster analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A set of accessions of Oryza sativa from the International Rice Research Institute (Philippines) that included known and suspected duplicates as well as closely related germplasm has been subjected to RAPD analysis. The number of primers, the number of polymorphic bands and the total number of bands were determined that will allow the accurate discrimination of these categories of accessions, including the identification of true and suspected duplicates. Two procedures have been described that could be employed on a more general basis for identifying duplicates in genetic resources collections, and further discussion on the values of such activities is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222920
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  • 7
    Electronic Resource
    Electronic Resource
    Weighted regression analysis for comparing varietal adaptation (1991)
    Springer
    Theoretical and applied genetics 81 (1991), S. 559-561 
    Details
    ISSN: 1432-2242
    Keywords: Pennisetum typhoides ; Pearl millet ; Weighted regression analysis ; Stability analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The normally used joint linear regression analysis (OLS) is not appropriate for comparing estimates of stability parameters of varieties when the error variances of site means are heterogeneous. Weighted regression analysis (WLS), in these situations, yields more precise estimates of stability parameters. A comparison of the two analytical methods using the grain yield (kg ha−1) data of 12 varieties and one hybrid of pearl millet [Pennisetum typhoides (Burm.) S. & H.], tested at 26 sites in India, revealed that the weighted regression analysis yields more efficient estimates of regression coefficients (b i ) than the ordinary regression analysis, and that the standard errors of b i values were reduced by up to 43%. The estimated b i differed with the two procedures. The number of varieties with b i ssignificantly deviating from unity was not only more (five varieties) with weighted regression analysis than the ordinary regression analysis (one variety), but the classification of varieties as possessing general or specific adaptation differed with the two procedures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00219449
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  • 8
    Electronic Resource
    Electronic Resource
    The nature of gene action in a Nicotiana rustica cross revealed by the recombinant inbred and second-cycle hybrid analysis (1997)
    Springer
    Theoretical and applied genetics 94 (1997), S. 664-673 
    Details
    ISSN: 1432-2242
    Keywords: Key words Dominance ratio ; Genetic variation ; Heritability ; Non-allelic interaction ; Transgression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  A unique set of data recorded on 60 randomly extracted single-seed-descent (F∞) lines of a highly heterotic cross between two varieties of Nicotiana rustica and their 870 reciprocally produced pairwise crosses, the second-cycle hybrids (SCH), are analysed to investigate the true nature of genetical control in the cross and the results are compared with those in earlier publications. The analysis revealed that epistasis, genotype-by-micro-environmental interaction, maternal effects and linkage are significant for several characters and the additive and non-additive components of variation take large values for all of the traits. Epistasis is predominantly duplicate and not complementary. Dominance is high but partial, all estimates of dominance ratio lying between 0.5 and 0.9. Dominance is predominantly unidirectional for leaf length, leaf width and final height, while for the remaining traits, some genes show ambidirectional dominance, although the incidence of unidirectional dominance is much higher throughout. The direction of dominance is predominantly for the increased score, except for flowering time where alleles conferring earliness are up to five times more frequently dominant. The present study has also confirmed that the F2 and SCHi distributions are very similar and that the former can be used to predict the transgression in the latter with confidence. The reduced range of the SCH i families compared to the recombinant inbreds, further indicated that heterosis among many of the SCHi is due to gene dispersion and there is little evidence for the presence of over-dominance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050464
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  • 9
    Electronic Resource
    Electronic Resource
    Fast and reliable genotype validation using microsatellite markers in Arabidopsis thaliana (1999)
    Springer
    Theoretical and applied genetics 98 (1999), S. 462-464 
    Details
    ISSN: 1432-2242
    Keywords: Key words Arabidopsis ; Microsatellites ; DNA markers ; PCR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  In this paper we show how rogue genotypes in the parental stocks or contaminants among the crossed progeny of Arabidopsis thaliana can be readily identified and excluded from the breeding process using microsatellite markers derived from a small quantity of intact leaf tissue which has been alkali-treated. This method is fast and cost effective as it does not require DNA extraction, is highly reliable, and is less damaging to small plants where only limited quantities of plant tissue are available. Furthermore, a large number of samples can be processed in 1 day, facilitating the identification process prior to selfing or crossing the plants. In addition, the procedure could potentially be automated since no centrifugation is required.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051092
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  • 10
    Electronic Resource
    Electronic Resource
    Are mapped markers more useful for assessing genetic diversity? (2000)
    Springer
    Theoretical and applied genetics 100 (2000), S. 607-613 
    Details
    ISSN: 1432-2242
    Keywords: Key words AFLP ; Biodiversity ; Genetic maps ; Genetic resources ; Rice
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Genetic diversity within populations of organisms and species is commonly measured using molecular-marker data. It has been claimed that more reliable diversity measurements can be obtained using selected genetically mapped markers to ensure that all regions of the genome are represented in the data sets employed. However, this has not been tested. In the present study, using rice (Oryza sativa L.) as a model species, we have shown that the use of unmapped AFLP markers reveals a pattern of diversity that is very similar to that obtained using a range of other marker types and which reflects the known crossability groups within this species. In contrast, we show that use of mapped-marker data can, in some cases, result in highly misleading patterns of diversity; the results obtained are critically related to the choice ofparents used in the cross from which the mapping population was produced. For diversity analyses, we propose that it is appropriate to use unmapped markers provided that the marker-type has been shown to have a wide distribution over the genome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050080
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