Empirical comparison of genomic and phenotypic selection for resistance to Fusarium ear rot and fumonisin contamination in maize

Key message GS and PS performed similarly in improving resistance to FER and FUM content. With cheaper and faster genotyping methods, GS has the potential to be more efficient than PS. Fusarium verticillioides is a common maize ( Zea mays L. ) pathogen that causes Fusarium ear rot (FER) and produces...

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Published in:	Theoretical and applied genetics 2022-08, Vol.135 (8), p.2799-2816
Main Authors:	Butoto, Eric N., Brewer, Jason C., Holland, James B.
Format:	Article
Language:	eng
Subjects:	Accuracy Agricultural research Agriculture Biochemistry Biomedical and Life Sciences Biotechnology Cancer Contamination Control Corn Diseases and pests Ear rot Fungal diseases of plants Fusarium Fusarium verticillioides Genetic aspects Genetic diversity Genetic markers Genomes Genomics Genotype Genotypes Genotyping Heritability Inheritances Life Sciences Methods Original Article Phenotype Plant Biochemistry Plant Breeding/Biotechnology Plant Genetics and Genomics Plant immunology Quantitative trait loci Soil sciences Zea mays
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Summary:	Key message GS and PS performed similarly in improving resistance to FER and FUM content. With cheaper and faster genotyping methods, GS has the potential to be more efficient than PS. Fusarium verticillioides is a common maize ( Zea mays L. ) pathogen that causes Fusarium ear rot (FER) and produces the mycotoxin fumonisin (FUM). This study empirically compared phenotypic selection (PS) and genomic selection (GS) for improving FER and FUM resistance. Three intermating generations of recurrent GS were conducted in the same time frame and from a common base population as two generations of recurrent PS. Lines sampled from each PS and GS cycle were evaluated in three North Carolina environments in 2020. We observed similar cumulative responses to GS and PS, representing decreases of about 50% of mean FER and FUM compared to the base population. The first cycle of GS was more effective than later cycles. PS and GS both achieved about 70% of predicted total gain from selection for FER, but only about 26% of predicted gains for FUM, suggesting that heritability for FUM was overestimated. We observed a 20% decrease in genetic marker variation from PS and 30% decrease from GS. Our greatest challenge was our inability to quickly obtain dense and consistent set of marker genotypes across generations of GS. Practical implementation of GS in individual small-scale breeding programs will require cheaper and faster genotyping methods, and such technological advances will present opportunities to significantly optimize selection and mating schemes for future GS efforts beyond what we were able to achieve in this study.
ISSN:	0040-5752 1432-2242