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|Title: ||Factor analysis using mixed models of multi-environment trials with different levels of unbalancing|
|???metadata.dc.creator???: ||Nuvunga, J. J.|
Oliveira, L .A.
Pamplona, A. K. A.
Silva, C. P.
Lima, R. R.
|Keywords: ||G x E interaction|
|Publisher: ||Fundação de Pesquisas Científicas de Ribeirão Preto|
|Issue Date: ||13-Nov-2015|
|Citation: ||NUVUNGA, J. J. et al. Factor analysis using mixed models of multi-environment trials with different levels of unbalancing. Genetics and Molecular Research, Ribeirão Preto, v. 14, n. 4, p. 14262-14278, Nov. 2015.|
|Abstract: ||This study aimed to analyze the robustness of mixed models
for the study of genotype-environment interactions (G x E). Simulated
unbalancing of real data was used to determine if the method could
predict missing genotypes and select stable genotypes. Data from multienvironment
trials containing 55 maize hybrids, collected during the 2005-
2006 harvest season, were used in this study. Analyses were performed
in two steps: the variance components were estimated by restricted
maximum likelihood, using the expectation-maximization (EM) algorithm,
and factor analysis (FA) was used to calculate the factor scores and
relative position of each genotype in the biplot. Random unbalancing of the
data was performed by removing 10, 30, and 50% of the plots; the scores
were then re-estimated using the FA model. It was observed that 10, 30,
and 50% unbalancing exhibited mean correlation values of 0.7, 0.6, and
0.56, respectively. Overall, the genotypes classified as stable in the biplot
had smaller prediction error sum of squares (PRESS) value and prediction amplitude of ellipses. Therefore, our results revealed the applicability of
the PRESS statistic to evaluate the performance of stable genotypes in
the biplot. This result was confirmed by the sizes of the prediction ellipses,
which were smaller for the stable genotypes. Therefore, mixed models can
confidently be used to evaluate stability in plant breeding programs, even
with highly unbalanced data.|
|Appears in Collections:||DEX - Artigos publicados em periódicos|
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