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Analysis of diallel crosses with F₂ generations

José B. de Miranda Filho^I; Lázaro J. Chaves^II

^IDepartamento de Genética, Escola Superior de Agricultura "Luiz de Queiróz", Universidade de São Paulo, Caixa Postal 83, 13400-900 Piracicaba, SP, Brasil. Send correspondence to J.B.M.F.
^IIDepartamento de Agricultura, Universidade Federal de Goiás, Caixa Postal 131, 74001-970 Goiânia, GO, Brasil

ABSTRACT

The model of Gardner and Eberhart (Biometrics 22: 439-452,1966) was used for the analysis of variety diallel crosses, in which the F₂ generations, instead of the F₁ hybrids, are used. The least square procedure was used to derive the formulas for estimation of effects (components of means) and for the analysis of variance. The estimators of the mean (m) and variety effects (v_i) did not differ from the original model; but the estimators of the heterosis components for F₂ data were twice those obtained from the original model. In the same way, the standard errors of the estimates were different only for the heterosis components, when compared with formulas from the original model, while the formulas for the analysis of variance were the same.

Keywords: diallel crosses.

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