Full text in pdf format

Genetical analysis of a soybean biparental cross and comparative model fitting to means and variances of two sets of generations

José Francisco Ferraz de Toledo; Maria Clarete Rossini; Rogério Fernandes de Souza; Fernando Ferreira Leão

Centro Nacional de Pesquisa de Soja, EMBRAPA, Caixa Postal 1061, 86001 Londrina, PR, Brasil

ABSTRACT

Genetical analysis of self-pollinating species usually involves the six basic generations (P_i, P₂, F₁, F₂, BC₁ and BC₂). The F₁, BC₁ and BC₂ are obtained by hand pollination and for some species like soybeans, rice and wheat this process can be time and labour consuming. Greater advances in the knowledge of the genetical architecture of important characteristics would be possible if reliable analysis and predictions could be obtained from a more restricted set of generations, P₁, P₂, F₂ and F₃, that are readily obtainable from most of the strictly self-pollinating plant species. In spite of a loss of sensitivity, accurate results are obtainable from the restricted set, especially regarding detection and estimation of additive genetic, dominance and additive environmental effects. It allows a reliable test for G x E interaction and linkage. However, it is inherently weak in detecting epistatic effects. The predictions made from the restricted set are at least as good as those from the six basic generations.

Keywords: Soybean; Biparental cross.

REFERENCES

Cavalli, L.L. (1952). An analysis of linkage in quantitative inheritance. In: Quantitative Inheritance (E.C.R. Reeve and C.H. Waddington, eds.). pp. 135-144, HMSO, London.

Comstock, R.E. and Robinson, H.F. (1952). Estimation of average dominance of genes. In: Heterosis (Gowen, J.W., ed.). pp. 494-516, Iowa State College Press, Ames, Iowa.

Hayman, B.I. (1960). Maximum likelihood estimation of genetic components of variation. Biometrics 16: 369-381.

Jinks, J.L. (1978). Unambiguous test for linkage of genes displaying non-allelic interactions for a metrical trait. Heredity 40: 171-173.

Jinks, J.L. and Jones, R.M. (1958). Estimation of the components of heterosis. Genetics 43: 223-234.

Jinks, J.L. and Pooni, H.S. (1976). Predicting the properties of recombinant inbred lines derived by single seed descent. Heredity 36: 253-266.

Kearsey, M.J. and Jinks, J.L. (1968). A general method of detecting additive, dominance and epistatic variation for metrical traits: I Theory. Heredity 23: 403-409.

Mather, K. (1949). Biometrical Genetics (1st Edn.). Methuen, London.

Mather, K. and Jinks, J.L. (1982). Biometrical Genetics (3rd Edn.), Chapman and Hall, London.

Perkins, J.M. and Jinks, J.L. (1970). Detection and estimation of genotype-environmental, linkage and epistatic components of variation for a metrical trait. Heredity 25: 157-177.

Pooni, H.S. and Jinks, J.L. (1982). Comparative analysis of association and dispersion crosses to detect linkage and epistatic components of variation. Heredity 49: 211-220.

Toledo, J.F.F. de. (1987). Predicting the inbreeding and the outcrossing potential of soybean (Glycine max (L.) Merrill) varieties. Rev. Brasil. Genet. 10: 543-558.

Toledo, J.F.F. de. (1989). Quantitative Genetics in Soybean Breeding. Proceedings of the World Soybean Conference IV (ed. Pascall, AJ.). pp. 903-914, Buenos Aires.

Toledo, J.F.F. de. (1991). Programa de Computador para Estimar Parâmetros Genéticos pelo Método dos Quadrados Mínimos Ponderados. Pesq. Agropec. Bras. 26: 1023-1039.

Van der Veen, J.H. (1959). Test of non-allelic interaction and linkage for quantitative characters in generations derived from two diploid pure lines. Genetica 30: 201-232.