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An alternative approach to the stability analysis proposed by Silva and Barreto

 

 

C.D. CruzI; R.A. de A. TorresII; R. VencovskyIII

IDepartamento de Biologia Geral, Universidade Federal de Viçosa, 36570 Viçosa, MG, Brasil. Send correspondence to C.D.C.
IIDepartamento de Biologia Geral, Universidade Federal de Goiás, 74000 Goiânia, GO, Brasil
IIIDepartamento de Genética, Escola Superior de Agricultura "Luiz de Queiróz"/USP, 13400 Piracicaba, SP, Brasil

 

 

ABSTRACT

A modification of the stability analysis proposed by Silva and Barreto (Simpósio de Experimentação Agrícola, 1, Piracicaba. Fundação Cargill, Campinas, pp. 49-50, 1985) is presented and discussed. The original and modified analysis are applied for comparison, to yield data of corn trials, with 17 cultivars tested in 12 locations, during 1982/83. It could be shown that the alternative approach has fundamental properties, not inherent in the original one, namely: the computation of parameter estimates and sums of squares is much simplified; the standard errors of these estimates are smaller; the residual correlations, between stability parameter estimates of more interest are eliminated. The latter property permits a better evaluation of the genetic correlation eventually present between stability patterns, for a given trait.
Expressions are given to calculate estimates of parameters, their variances and of sums of squares, for the modified model.

Keywords: Stability analysis.

 

 

REFERENCES

Eberhart, S.A. an   ussell, W.A. (1966). Stability parameters for comparing varieties. Crop Sci. 6: 36-40.

Silva, J.G.C. e Barreto, JAN. (1985). Aplicação da regressão linear segmentada em estudos da interação genótipo x ambiente. In: Simpósio de Experimentação Agricola, 1, Piracicaba, 1985. Resumos. Campinas. Fundação Cargill, p. 49-50.

Verma, M.M., Chahal, G. . and Murty, B.R. (1978). Limitations of conventional regression analysis: a proposed modifica ion. Theor. Appl. Genet. 53:89-91.

Torres, R.A.A. (1988). Estudo do controle genético da estabilidade fenotípica de cultivares de milho (Zea mays L.) Tese de Doutorado. Piracicaba, SP, 132 pp.