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Impact of Genetic Divergence on the Ratio of Variance Due to Specific vs. General Combining Ability in Winter Triticale


This article in CS

  1. Vol. 49 No. 6, p. 2119-2122
    Received: Dec 5, 2008

    * Corresponding author(s): melchinger@uni-hohenheim.de
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  1. S. Fischera,
  2. J. Möhringc,
  3. H.P. Maurerb,
  4. H.-P. Piephoc,
  5. E.-M. Thiemte,
  6. C.C. Schönd,
  7. A.E. Melchinger *a and
  8. J.C. Reifb
  1. a Institute of Plant Breeding, Seed Science, and Population Genetics, Univ. of Hohenheim, 70593 Stuttgart, Germany
    c Bioinformatics Unit, Institute for Crop Production and Grassland Research, Univ. of Hohenheim, 70593 Stuttgart, Germany
    b State Plant Breeding Institute, Univ. of Hohenheim, 70593 Stuttgart, Germany
    e Bundessortenamt, Testing Station Scharnhorst, In Scharnhorst 2, 31535 Neustadt, Germany. S. Fischer and J. Möhring contributed equally to this work
    d Plant Breeding, Center of Life and Food Sciences Weihenstephan, Technische Universitaet Muenchen, 85350 Freising, Germany


The objective of our study was to examine the influence of genetic divergence on the ratio of the components of variance for specific (σ2 SCA) and general (σ2 GCA) combining ability using experimental data in triticale (×Triticosecale Wittm.). In total, 21 lines and their 210 crosses were evaluated for grain yield in field trials. Published molecular data were reanalyzed, indicating an optimum of two subgroups. The estimates of σ2 SCA and σ2 GCA were determined for the total diallel and between the two subgroups. The ratio of σ2 SCA vs. σ2 GCA tended to be lower for crosses between than within genetically distinct groups. Our experimental findings can be interpreted as an indicator of a more favorable ratio of σ2 SCA vs. σ2 GCA in situations with two genetically distinct populations than in situations with populations that are not genetically distinct.

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