Dominance Effects and Functional Enrichments Improve Prediction of Agronomic Traits in Hybrid Maize.

Genetics
G. P. RamsteinM Cinta Romay

Abstract

Single-cross hybrids have been critical to the improvement of maize (Zea mays L.), but the characterization of their genetic architectures remains challenging. Previous studies of hybrid maize have shown the contribution of within-locus complementation effects (dominance) and their differential importance across functional classes of loci. However, they have generally considered panels of limited genetic diversity, and have shown little benefit from genomic prediction based on dominance or functional enrichments. This study investigates the relevance of dominance and functional classes of variants in genomic models for agronomic traits in diverse populations of hybrid maize. We based our analyses on a diverse panel of inbred lines crossed with two testers representative of the major heterotic groups in the U.S. (1106 hybrids), as well as a collection of 24 biparental populations crossed with a single tester (1640 hybrids). We investigated three agronomic traits: days to silking (DTS), plant height (PH), and grain yield (GY). Our results point to the presence of dominance for all traits, but also among-locus complementation (epistasis) for DTS and genotype-by-environment interactions for GY. Consistently, dominance improved geno...Continue Reading

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Citations

Dec 29, 2020·IScience·Aalt Dirk Jan van DijkDick de Ridder
Feb 2, 2021·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Dominic KnochThomas Altmann
Jan 6, 2021·Nature Communications·Myung-Shin KimSoon-Chun Jeong
Apr 18, 2021·Genetics·David González-DiéguezZulma G Vitezica

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Methods Mentioned

BETA
two hybrid
PCA

Software Mentioned

DGBLUP
RcppEigen
DGBLUP GBLUP
R package mgcv
Hapmap
Ames
GBLUP
TASSEL
CreateHybridGenotypesPlugin
R

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