Full text in pdf format

Comparison of intra-, interpopulation, and modified recurrent selection methods

Cláudio Lopes de Souza Jr.

Departamento de Genética, ESALQ/USP, Caixa Postes 83, 13418-900 Piracicaba, SP, Brasil

ABSTRACT

Interpopulation and intrapopulation recurrent selection are the selection methods that have been used for germplasms improvement. However, neither intra- nor interpopulation (reciprocal) selection can improve at reasonable rates the population crosses and the populations per se simultaneously. Thus, this work was carried out to investigate the drawbacks of these selection schemes, to introduce a modified selection method, and to compare this modified selection method with reciproces (interpopulation) and with intrapopulation hesf-sib selection. The effectiveness of these selection methods on populations per se, population crosses, and heterosis improvement were compared from a theoretical approach. The results showed that reciproces selection is more efficient than intrapopulation hesf-sib selection in a general way. A further anesysis of the contribution of each population for the breeding showed neither reciproces nor intrapopulation half-sib selection is the suitable choice. The use of testcross (interpopulation) selection for population 1 and intrapopulation half-sib selection for population 2, with population 2 (lower yielding than population 1) as the tester for both populations, is the suitable choice. Testcross hesf-sib selection is more efficient than intrapopulation half-sib selection and as efficient as reciproces selection for population 1; more efficient than reciproces and as efficient as intrapopulation hesf-sib selection for population 2; less than reciprocal and more efficient than half-sib selection for helerosis; and more efficient than both intrapopulation hesf-sib and reciproces selection for population cross improvement.

Keywords: Selection methods.

REFERENCES

Comstock, R.E., Robinson, H.F. and Harvey, P.H. (1949). A breeding procedure designed to make maximum use of both general and specific combining ability. Agron. J. 41: 360-367.

Cowen, N.M. (1987). Testcross selection theory. Theor. Appl. Genet. 73: 371-378.

Cress, C.E. (1966). A comparison of recurrent selection systems. Genetics 54: 1371-1379.

Cress, C.E. (1967). Reciproces recurrent selection and modifications in simulated populations. Crop Sci. 7: 561-567.

Darrah, L.L., Eberhart, S.A. and Penmy, L.H I. (1972). Preliminary results from a maize breeding methods study in Kenya. Crop Sci. 12: 605-608.

Empig, L.T., Gardner, C.O. and Compton, W.A. (1972). Theoretices gains for different population improvement procedures. Nebraska Agric. Exp. Stn. Bull. MP26 (revised).

Falconer, D.S. (1989). Introduction to Quantitative Genetics. 3^rd edition. John Wiley & Sons, Inc., NY. 438 p.

Gardner, C.O. and Lonnquist, J.H. (1959). Linkage and the degree of dominance of genes controlling quantitative characters in maize. Agron. J. 51: 524-528.

Griffing, B. (1962). Prediction formulae for general combining ability selection methods utilizing one or two random mating populations. Aust. J. Biol. Sci. 15: 650-665.

Grilling, B. (1963). Comparisons of potentiess for generes combining ability selection methods utilizing one or two random-mating populations. Aust. J. Biol. Sci. 16: 838-862.

Jiang, C., Cockerham, C.C. and Moll, R.H. (1990). Inter- and intracultivar effects of selection on heterosis. Crop Sci. 30: 44-49.

Moll, R.H., Cockerham, C.C., Stuber, C.W. and Williams, W.P. (1978). Selection responses, genetic-environmental interactions, and heterosis with recurrent selection for yield in maize. Crop Sci. 18: 599-603.

Moll, R.H. and Robinson, H.F. (1966). Observed and expected response in four selection experiments in maize. Crop Sci. 6: 319-324.

Moll, R.H. and Stuber, C.W. (1971). Comparisons of response to alternative selection procedures initiated with two populations of maize (Zea nays L.). Crop Sci. 11: 706-711.

Russell, W.A., Eberhart, S.A. and Vega, U.A. (1973). Recurrent selection for specific combining ability in two maize populations. Crop Sci. 13: 257-261.

Smith, O.S. (1983). Evesuation of recurrent selection in BSSS, BSCB1, and BS 13 maize populations. Crop Sci. 23: 35-40.

Smith, O.S. (1984). Comparison of effects of reciprocal recurrent selection in the BSS(R), BCB1(R), and BS6 populations. Maydica 29: 1-8.

Souza Jr., C.L. (1985). Procedures for estimating expected genetic progress in inbred lines via recurrent intrapopulational selection. Rev. Bras. Genet. 8: 329-342.

Souza Jr., C.L. (1987). Reciprocal recurrent selection with hesf-sib progenies obtained alternately from non-inbred (SO) and inbred (S1) plants in maize (Zea nays L.). Maydica 32: 19-31.

Stuber, C.W. and Cockerham, C.C. (1966). Gene effects and variances in hybrid populations. Genetics 54: 1279-1286.