A new method to estimate genetic gain in annual crops.
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.
Main Authors: | BRESEGHELLO, F., MORAIS, O. P. de, RANGEL, P. H. N. |
---|---|
Other Authors: | FLAVIO BRESEGHELLO, CNPAF; ORLANDO PEIXOTO DE MORAIS, CNPAF; PAULO HIDEO NAKANO RANGEL, CNPAF. |
Format: | Artigo de periódico biblioteca |
Language: | English eng |
Published: |
1999-03-17
|
Subjects: | Melhoramento genético vegetal, Genética, |
Online Access: | http://www.alice.cnptia.embrapa.br/alice/handle/doc/205636 https://doi.org/10.1590/S1415-47571998000400024 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Similar Items
-
Selection of local lowland rice cultivars based on multivariate genetic divergence.
by: RANGEL, P. H. N., et al.
Published: (1994-10-26) -
Genetic potential of common bean progenies selected for crude fiber content obtained through different breeding methods.
by: PONTES JÚNIOR, V. de A., et al.
Published: (2015-06-01) -
Estimates of genetic parameters of late seed-coat darkening of carioca type dry beans.
by: ARAÚJO, L. C. A. de, et al.
Published: (2012-05-29T11:11:11Z) -
Performance de híbridos e análise dialélica de linhagens de sorgo granífero.
by: VIEIRA, I. C. S., et al.
Published: (2013-07-15) -
Programa de melhoramento de pínus na Embrapa Florestas.
by: AGUIAR, A. V. de, et al.
Published: (2011)