Selection index in the study of adaptability and stability in maize.
This paper proposes an alternative method for evaluating the stability and adaptability of maize hybrids using a genotype-ideotype distance index (GIDI) for selection. Data from seven variables were used, obtained through evaluation of 25 maize hybrids at six sites in southern Brazil. The GIDI was estimated by means of the generalized Mahalanobis distance for each plot of the test. We then proceeded to GGE biplot analysis in order to compare the predictive accuracy of the GGE models and the grouping of environments and to select the best five hybrids. The G × E interaction was significant for both variables assessed. The GGE model with two principal components obtained a predictive accuracy (PRECORR) of 0.8913 for the GIDI and 0.8709 for yield (t ha(-1)). Two groups of environments were obtained upon analyzing the GIDI, whereas all the environments remained in the same group upon analyzing yield. Coincidence occurred in only two hybrids considering evaluation of the two features. The GIDI assessment provided for selection of hybrids that combine adaptability and stability in most of the variables assessed, making its use more highly recommended than analyzing each variable separately. Not all the higher-yielding hybrids were the best in the other variables assessed.
Engenheiro Agrônomo, Mestre em Genética e Melhoramento de Plantas, DuPont do Brasil S.A. Divisão Pioneer Sementes, Rodovia GO 210 km 04, Fazenda Santa Maria de Baixo, Zona Rural, Caixa Postal 1014, 75503-970 Itumbiara, GO, Brazil.
Rogério
R
Lunezzo de Oliveira
Engenheiro Agrônomo, Doutor em Genética e Melhoramento de Plantas, Departamento de Agricultura/DAG, Universidade Federal de Lavras (UFLA), Lavras, MG, Brazil.
Renzo
R
Garcia Von Pinho
Engenheiro Agrônomo, Pós-Doutor em Estatística e Experimentação Agronômica, Departamento de Ciências Exatas (DEX), Universidade Federal de Lavras (UFLA), Lavras, MG, Brazil.
Daniel
D
Furtado Ferreira
Engenheiro Agrônomo, Mestre em Genética e Melhoramento de Plantas, Departamento de Biologia/DBI, Universidade Federal de Lavras (UFLA), Lavras, MG, Brazil.
Luiz Paulo
0000-0003-4858-2858
LP
Miranda Pires
Engenheiro Agrônomo, Doutor Agronomia/Fitotecnia, Advanta Comércio de Sementes Ltda, Florianópolis, SC, Brazil.
Wagner Mateus
WM
Costa Melo
D000222:Adaptation, Physiological / Q000235:genetics*; D001938:Brazil; D002874:Chromosome Mapping / Q000379:methods*; D018745:Genome, Plant / Q000235:genetics*; D042822:Genomic Instability / Q000235:genetics*; D005838:Genotype; D020641:Polymorphism, Single Nucleotide / Q000235:genetics; D040641:Quantitative Trait Loci / Q000235:genetics*; D019655:Quantitative Trait, Heritable; D012641:Selection, Genetic / Q000235:genetics*