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Published online 22 October 2009
Published in Crop Sci 49:2119-2122 (2009)
© 2009 Crop Science Society of America
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CROP BREEDING & GENETICS-NOTES

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

S. Fischera, J. Möhringc, H.P. Maurerb, H.-P. Piephoc, E.-M. Thiemte, C.C. Schönd, A.E. Melchingera,* and J.C. Reifb

a Institute of Plant Breeding, Seed Science, and Population Genetics, Univ. of Hohenheim, 70593 Stuttgart, Germany
b State Plant Breeding Institute, Univ. of Hohenheim, 70593 Stuttgart, Germany
c Bioinformatics Unit, Institute for Crop Production and Grassland Research, Univ. of Hohenheim, 70593 Stuttgart, Germany
d Plant Breeding, Center of Life and Food Sciences Weihenstephan, Technische Universitaet Muenchen, 85350 Freising, Germany
e Bundessortenamt, Testing Station Scharnhorst, In Scharnhorst 2, 31535 Neustadt, Germany. S. Fischer and J. Möhring contributed equally to this work

* Corresponding author (melchinger{at}uni-hohenheim.de).

The objective of our study was to examine the influence of genetic divergence on the ratio of the components of variance for specific ({sigma}2SCA) and general ({sigma}2GCA) combining ability using experimental data in triticale (xTriticosecale 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 {sigma}2SCA and {sigma}2GCA were determined for the total diallel and between the two subgroups. The ratio of {sigma}2SCA vs. {sigma}2GCA 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 {sigma}2SCA vs. {sigma}2GCA in situations with two genetically distinct populations than in situations with populations that are not genetically distinct.

Abbreviations: GCA, general combining ability • SCA, specific combining ability






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