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  • 1
    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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  • 2
    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
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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