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  • Medicago sativa L.  (1)
  • Selection pressure  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Recombination rates of soybean varieties from different periods of introduction and release (1993)
    Springer
    Theoretical and applied genetics 86 (1993), S. 557-561 
    Details
    ISSN: 1432-2242
    Keywords: Glycine max ; Plant breeding ; Selection pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Theory predicts that selection for adaptability during the short term also favors selection for a reduced recombination rate in the population. The objective of this study was to test whether the cyclic short-term selection which has taken place in soybean breeding programs in the USA since the introduction of the crop has measurably reduced recombination frequencies. Thirteen soybean varieties separated into four different release periods (prior to 1940, 1940–1954, 1955–1969, after 1970) were evaluated for their recombination frequencies within three locus pairs. Recombination frequencies among the individual varieties ranged from 7.6 to 24.1 % at thep 1 r locus pair, from 20.9 to 30.1 % at thelnp 2 locus pair, and from 28.7 to 41.6% at thedt 1 l 1 locus pair. Recombination frequencies were significantly different among varieties within a release period for thep 1 r andlnp 2 locus pairs, but recombination frequencies did not differ among release periods for any locus pair. Thus, apparently, plant breeders have developed soybean varieties with improved adaptation without influencing recombination rates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00838708
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  • 2
    Electronic Resource
    Electronic Resource
    Comparisons of alfalfa somaclonal and sexual derivatives from the same genetic source (1984)
    Springer
    Theoretical and applied genetics 67 (1984), S. 263-266 
    Details
    ISSN: 1432-2242
    Keywords: Medicago sativa L. ; 2n gametes ; Tissue culture ; Chromosome doubling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Tetraploid alfalfa (Medicago sativa L.) clones were derived from the same diploid genetic background by four different methods. A phenotypically superior clone was selected from each method and compared for herbage yield and fertility. The four methods and their best clones were: a) In vitro somatic chromosome doubling of one diploid hybrid (HG2-4x); b) selection within a two allele tetraploid synthetic population derived from HG2-4x (HAG); c) somaclonal variant selection from cell suspension culture of the diploid hybrid (NS1); and d) sexual polyploidization of a sibling hybrid (HXG). Clones HG2-4x, HAG, and NS1 were likely diallelic or monoallelic at all loci. Clone HXG was probably tetrallelic or triallelic at most loci. Experiments measured fertility, clonal herbage yield, and herbage yield of test cross progeny for each selected clone. Fertility rankings were HXG = HAG 〉 NS1 〉 HG2-4x. Clonal herbage yield rankings were HXG = HAG 〉 NS1 〉 HG2-4x. Test cross progeny herbage yield rankings varied depending on the tester, but, in general, HXG ≧ HAG ≧ NS1 HG2-4x. Overall the best clones from the sexual methods exceeded the best somaclonal variant which, in turn, was better than the chromosome doubled clone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317051
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    Paper (German National Licenses)
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