Original scientific paper

https://doi.org/10.18047/poljo.26.1.2

FACTORS AFFECTING THE ACCURACY OF GENOMIC PREDICTIONS IN TESTCROSSES OF MAIZE BIPARENTAL POPULATION

Vlatko Galić ; Agricultural Institute Osijek, Južno predgrađe 17, 31000 Osijek, Croatia
Maja Mazur ; Agricultural Institute Osijek, Južno predgrađe 17, 31000 Osijek, Croatia
Andrija Brkić ; Agricultural Institute Osijek, Južno predgrađe 17, 31000 Osijek, Croatia
Mirna Volenik ; Agricultural Institute Osijek, Južno predgrađe 17, 31000 Osijek, Croatia
Antun Jambrović ; Agricultural Institute Osijek, Južno predgrađe 17, 31000 Osijek, Croatia; Centre of Excellence for Biodiversity and Molecular Plant Breeding, Svetošimunska 25, Zagreb, Croatia
Zvonimir Zdunić ; Agricultural Institute Osijek, Južno predgrađe 17, 31000 Osijek, Croatia; Centre of Excellence for Biodiversity and Molecular Plant Breeding, Svetošimunska 25, Zagreb, Croatia
Domagoj Šimić ; Agricultural Institute Osijek, Južno predgrađe 17, 31000 Osijek, Croatia; Centre of Excellence for Biodiversity and Molecular Plant Breeding, Svetošimunska 25, Zagreb, Croatia

Abstract

Genomic prediction accuracy (r_MP) is affected by many factors, such as the trait heritability, training population size and structure, and the number of markers. This study’s objective was to investigate the factors associated with r_MP for the ear height and the plant height in two planting densities in testcrosses of maize (Zea mays L.) IBM population. Genetic correlations between the training and validation populations were calculated. The high heritability estimates and correlations between the traits were observed. The non-zero estimates of r_MP for all trait-density combinations implied an efficiency of genomic selection. The lower than expected values of genetic correlations were observed between the training and validation populations. However, a strong correlation was observed between a genetic correlation of training and the validation population and r_MP in all three sizes of training populations assessed (20-40%, 40-60%, and 60-80%), suggesting that the size of the training population can be kept low by an appropriate selection while maintaining a high r_MP. Further studies of relationships between the training and validation populations with larger effective population sizes are suggested, as reducing the size of training population while maintaining a high r_MP can facilitate a more effective allocation of resources in a maize breeding program.

Keywords

genomic selection; genomic prediction accuracy; training population size; planting density; plant architecture

Hrčak ID:

239715

URI

https://hrcak.srce.hr/239715

Publication date:

24.6.2020.

Article data in other languages: croatian

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