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|A new method to estimate genetic gain in annual crops.
MORAIS, O. P. de
RANGEL, P. H. N.
|FLAVIO BRESEGHELLO, CNPAF; ORLANDO PEIXOTO DE MORAIS, CNPAF; PAULO HIDEO NAKANO RANGEL, CNPAF.
|Genetics and Molecular Biology, v. 21, n. 4, p. 551-555, 1998.
|The genetic gain obtained by breeding programs to improve quantitative traits may be estimated by using data from regional trials. A new statistical method for this estimate is proposed and includes four steps: a) joint analysis of regional trial data using a generalized linear model to obtain adjusted genotype means and covariance matrix of these means for the whole studied period; b) calculation of the arithmetic mean of the adjusted genotype means, exclusively for the group of genotypes evaluated each year; c) direct year comparison of the arithmetic means calculated, and d) estimation of mean genetic gain by regression. Using the generalized least squares method, a weighted estimate of mean genetic gain during the period is calculated. This method permits a better cancellation of genotype x year and genotype x trial/year interactions, thus resulting in more precise estimates. This method can be applied to unbalanced data, allowing the estimation of genetic gain in series of multilocational trials.
|Melhoramento genético vegetal
|Type of Material:
|Artigo de periódico
|Appears in Collections:
|Artigo em periódico indexado (CNPAF)