Boosting predictive ability of tropical maize hybrids via genotype-by-environment interaction under multivariate GBLUP models

Author(s)

Krause, Matheus Dalsente ^{[1, 2]} ; das Gracas Dias, Kaio Olimpio ^[2] ; Rigal dos Santos, Jhonathan Pedroso ^[2] ; de Oliveira, Amanda Avelar ^[2] ; Moreira Guimaraes, Lauro Jose ^[3] ; Pastina, Maria Marta ^[3] ; Alves Margarido, Gabriel Rodrigues ^[2] ; Franco Garcia, Antonio Augusto ^[2]

Affiliation

^[1] Iowa State Univ, Dept Agron, Ames, IA 50011 - USA

^[2] Univ Sao Paulo, Dept Genet, Luiz de Queiroz Coll Agr, POB 83, BR-13400970 Piracicaba, SP - Brazil

^[3] Embrapa Milho & Sorgo, Rod MG 424, Km 65, BR-35701970 Sete Lagoas, MG - Brazil

• Document type: Journal article
• Source: CROP SCIENCE; v. 60, n. 6, p. 3049-3065, NOV-DEC 2020.
• Web of Science Citations: 1

Abstract

Genomic selection has been implemented in several plant and animal breeding programs and it has proven to improve efficiency and maximize genetic gains. Phenotypic data of grain yield was measured in 147 maize (Zea mays L.) single-cross hybrids at 12 environments. Single-cross hybrids genotypes were inferred based on their parents (inbred lines) via single nucleotide polymorphism (SNP) markers obtained from genotyping-by-sequencing (GBS). Factor analytic multiplicative genomic best linear unbiased prediction (GBLUP) models, in the framework of multienvironment trials, were used to predict grain yield performance of unobserved tropical maize single-cross hybrids. Predictions were performed for two situations: untested hybrids (CV1), and hybrids evaluated in some environments but missing in others (CV2). Models that borrowed information across individuals through genomic relationships and within individuals across environments presented higher predictive accuracy than those models that ignored it. For these models, predictive accuracies were up to 0.4 until eight environments were considered as missing for the validation set, which represents 67% of missing data for a given hybrid. These results highlight the importance of including genotype-by-environment interactions and genomic relationship information for boosting predictions of tropical maize single-cross hybrids for grain yield. (AU)

• FAPESP's process: 16/12977-7 - Genomic selection implementation in maize using a statistical-genetics model that accounts for genotype-by-environment interaction, additive and non-additive genetic effects
• Grantee: Kaio Olimpio das Graças Dias
• Support Opportunities: Scholarships in Brazil - Post-Doctoral