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Stability and adaptability of upland rice genotypes

The aim of this study was to identify upland rice genotypes with high stability and adaptability by the GGE biplot method based on the predicted genotypic and phenotypic values. Of the 20 genotypes evaluated, 14 were lines developed by the cooperative program for rice improvement of Minas Gerais and...

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Published in:Crop breeding and applied biotechnology 2010-12, Vol.10 (4), p.357-363
Main Authors: Balestre, Marcio(Universidade Federal de Lavras Departamento de Biologia), Santos, Vanderley Borges dos(UFLA Departamento de Agricultura), Soares, Antonio Alves(UFLA Departamento de Agricultura), Reis, Moisés Souza(UFLA Departamento de Agricultura)
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Language:English
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Summary:The aim of this study was to identify upland rice genotypes with high stability and adaptability by the GGE biplot method based on the predicted genotypic and phenotypic values. Of the 20 genotypes evaluated, 14 were lines developed by the cooperative program for rice improvement of Minas Gerais and six were controls. The GGE biplot analysis showed that cultivar BRS Pepita and MG1097 were closest to the ideal genotype. In the comparison of the fixed with the random models (% G + GE, prediction error sum of squares and correlation), it was observed that the use of phenotypic means in all comparative parameters indicated a lower predictive potential under simulated imbalance than the use of predicted genotypic values. The conclusion was drawn that BRS Pepita and MG1097 are ideal genotypes for southern Minas Gerais and that the predictive power of the phenotypic means underlying the study of stability and adaptability is lower than of genotypic means. O objetivo deste trabalho foi identificar genótipos de arroz de terras altas com alta estabilidade e adaptabilidade, pelo método GGE biplot empregando os valores fenotípicos e genotípicos preditos. Foram avaliados 20 genótipos, sendo 14 linhagens desenvolvidas pelo programa cooperativo de melhoramento de arroz de Minas Gerais e seis testemunhas. Verificou-se que a cultivar BRSPepita e MG1097, foram as mais próximas do "genótipo ideal" pela análise GGE Biplot. Em todos os parâmetros comparativos utilizados para comparação do modelo fixo e aleatório (% G+GE, PRESS e correlação), observou-se que o uso das médias fenotípicas apresentou menor potencial preditivo sob desbalanceamento simulado quando comparadas com o uso dos valores genotípicos preditos. Conclui-se que a cultivar BRS Pepita e MG1097 são os genótipos ideais para o sul de Minas Gerais e que a utilização das médias fenotípicas, como base para estudo de estabilidade e adaptabilidade, possui menor poder preditivo quando comparada ao uso das médias genotípicas.
ISSN:1984-7033
1984-7033
DOI:10.1590/S1984-70332010000400011