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  • 1
    Electronic Resource
    Electronic Resource
    Competitive ability of maize pollen. Intergametophytic effects (1980)
    Springer
    Theoretical and applied genetics 57 (1980), S. 37-41 
    Details
    ISSN: 1432-2242
    Keywords: Maize pollen ; Competitive ability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Intergametophytic influences on pollen competitive ability were studied by means of the pollen mixture technique: mixtures of pollen from different genetic sources, marked for the presence of the normal or the mutant allele of the opaque-2 gene, were used to pollinate o2o2 female plants. The variation of relative frequency of one of the two kernel types from apex to base of the resulting ear, made it possible to measure the competitive ability by regression coefficients. The effect of the pollen marker on the character was estimated by analyzing the progeny of heterozygous o2/+ plants self-pollinated through four generations. The o2 allele-bearing pollen revealed a slower germination rate than the dominant counterpart; no differences between the two pollen types were observed with regard to tube growth rate. The occurrence of intergametophytic interactions was confirmed: the competitive ability of a line varied according to the genotype of the competing pollen. Thus, this component has to be taken into account in considering male gametophyte fertilization ability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00276008
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Hybrid prediction in maize. Genetical effects and environmental variations (1972)
    Springer
    Theoretical and applied genetics 42 (1972), S. 346-350 
    Details
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary This paper proposes a method for predicting the performance of multiple cross hybrids on the basis of single cross information, taking into account the specific interaction of the genotypes with the environment. In the prediction model the genetical constants are those used for combining ability analysis, while genotype-environmental interaction terms are defined as linear regression of the genotypical effects on environmental variables. The model was tested by considering the variations arising from the effects of population density; therefore the method was applied in a situation in which the problem was to select the best hybrid-population density combinations. The results obtained show that the model is suitable to represent phenotypical response across densities. However, the material used was not the most suitable to emphasize the improvement of the predictive power of the function when genotype-environmental parameters are considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275359
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  • 3
    Electronic Resource
    Electronic Resource
    Herbicide-tolerant corn by pollen selection (1989)
    Springer
    Sexual plant reproduction 2 (1989), S. 65-69 
    Details
    ISSN: 1432-2145
    Keywords: Herbicide tolerance ; Pollen selection ; Sulfonylurea ; Chlorsulfuron
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Maize pollen was exposed to the herbicide Chlorsulfuron (CS), and segregation for tolerance was observed. The resulting plant generation exhibited significantly greater tolerance to CS than other (control) progeny. Since the increase in tolerance occurred after only one generation of pollen exposure, this result demonstrates that pollen selection can be used to develop herbicide-resistant crop species, even when the species are not amenable to cell culture. It also suggests a possible mechanism for the rapid evolution of herbicide tolerance in weeds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00191992
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  • 4
    Electronic Resource
    Electronic Resource
    Haplodiploid gene expression in maize and its detection (1983)
    Springer
    Biochemical genetics 21 (1983), S. 923-931 
    Details
    ISSN: 1573-4927
    Keywords: haploid gene expression ; male gametophyte ; B-A translocations ; isozyme pattern ; Zea mays
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract A method for the demonstration of the gametophytic origin of genetic variability in maize is described. For genes coding dimeric or multimeric enzymes, haploid expression can be demonstrated by means of translocations between A and B chromosomes (TB-A), which make it possible to obtain hyperploid pollen grains, partially diploid and heterozygous for electrophoretic mobility. Comparison of the electrophoretic pattern of this pollen type (three bands) and that of normal grains produced by a heterozygous F/S plant (two bands only) reveals haploid transcription of the monomeric forms. The procedure was tested on ADH-1 and used to demonstrate haploid expression for GOT-1. The data obtained suggest, moreover, that the reduction in male gamete transmission of duplications may be due to differences in pollen competitive ability rather than to processes affecting microspore maturation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00483950
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  • 5
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    Haplodiploid gene expression in maize and its detection (1983)
    Springer
    Details
    Publication Date: 1983-10-01
    Print ISSN: 0006-2928
    Electronic ISSN: 1573-4927
    Topics: Biology , Chemistry and Pharmacology
    Published by Springer
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