Single-step GWAS multi-trait threshold linear model for growth rate and heteroblasty in Eucalyptus globulus.
ABSTRACT.- Eucalyptus globulus Labill. is one of the most important species in the paper industry. Teratosphaeria nubilosa has affected plantations worldwide, infecting young foliage. Genome-wide association studies (GWASs) are essential to identify genomic segments associated with susceptibility to...
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| Other Authors: | , , |
| Format: | article |
| Language: | English |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://ainfo.inia.uy/consulta/busca?b=pc&id=65069&biblioteca=vazio&busca=65069&qFacets=65069 |
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| Summary: | ABSTRACT.- Eucalyptus globulus Labill. is one of the most important species in the paper industry. Teratosphaeria nubilosa has affected plantations worldwide, infecting young foliage. Genome-wide association studies (GWASs) are essential to identify genomic segments associated with susceptibility to this disease. The inclusion of genomic strategies in breeding programs is key to the sustainability of the species. The aim of this study was to identify genomic regions associated with growth and heteroblasty (change from juvenile to adult foliage: ADFO) in a tree breeding population of E. globulus. Tree growth was measured as total height (TH) and diameter at breast height (DBH). All traits were evaluated at 14 and 21 months. A multi-trait threshold linear model was developed following the single-step genomic selection methodology. Genetic correlations (rg) and narrow-sense heritability (h2) for all traits were estimated. Windows of 0.2 Mb were used. Only the windows with an estimated variance greater than 1% were considered. The rg ranged from 0.51 to 0.97. The h2 was high for ADFO (0.83-0.84) and lower for HT (0.37) and DBH (0.53). In growth traits, no QTLs were found that explained more than 1% of the variance. However, two genomic regions related to ADFO were identified on chromosomes 3 and 11. © 2025 by the authors. Licensee MDPI, Basel, Switzerland. |
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