Purpose
This project aimed to improve genetic selection in radiata pine by integrating genomic data with traditional pedigree-based approaches. The project enhanced breeding value predictions and accelerated genetic gains using single-step genomic selection.
Summary
This project improved productivity in softwood plantations by applying single-step genomic selection to radiata pine breeding. Researchers optimized DNA sampling and genotyping (process of determining the DNA sequence) using the Axiom PRAD array, refining 36,000 variants to 8,871 through rigorous filtering. This highlighted the need for custom genotyping arrays and a chromosome-level genome assembly. Pedigree verification revealed a low error rate (4–5%), confirming the reliability of breeding archives. Expanding the genomic training population from 2,000 to 5,000 trees improved breeding prediction accuracy, especially when combined with enhanced pedigree accuracy. Although some DNA storage duration experiments remained incomplete, the project confirmed the value of pedigree correction for reliable genetic evaluations. These outcomes laid the groundwork for faster, more accurate selection in forestry, supporting ongoing efforts under a sister project aimed at doubling genetic gain in Australian tree improvement programs.
Benefits to the Forest and Wood Products Industry
- Improved breeding efficiency: The project reduced the time needed to identify high-performing radiata pine trees, allowing faster deployment of superior genotypes in plantations.
- Higher wood yield and quality: By selecting trees with better genetic traits, the industry gained access to more productive and higher-quality timber resources.
- Lower operational costs: Genomic selection streamlined the breeding process, cutting down on field trials and reducing long-term costs for tree improvement programs.
Acknowledgement
This work was supported by funding provided to Forest and Wood Products Australia (FWPA) to administer the National Institute for Forest Products Innovation program (NIFPI).
Funding for the program was provided by the Australian Government, the Victorian Government and Australian forest and wood products industry
