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    Researchers linked apple genetic data with thousands of traits to understand fruit development. This study advances marker-assisted selection (MAS) for apples by identifying key genes influencing traits like ripening time and fruit firmness.

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    Area of Science:

    • Plant genetics
    • Agricultural science
    • Genomics

    Background:

    • Apples (Malus X Borkh.) are a globally significant fruit crop.
    • Marker-assisted selection (MAS) in apples is hindered by limited phenotype and genotype data.
    • Large sample sizes are crucial for establishing genotype-phenotype relationships in apples.

    Purpose of the Study:

    • To establish genotype-phenotype relationships in apples for advancing MAS.
    • To link extensive phenotype data with high-density SNP data in apple germplasm.
    • To identify genetic factors influencing key apple fruit traits.

    Main Methods:

    • Extracted over 24,000 phenotype scores from the USDA GRIN database.
    • Linked phenotype data with over 8000 single nucleotide polymorphisms (SNPs) from 689 apple accessions.
    • Conducted a genome-wide association study (GWAS) for 36 phenotypes.

    Main Results:

    • Identified significant genetic differentiation between Old World and New World apple cultivars.
    • Confirmed the association between fruit color and the MYB1 locus.
    • Reported a novel association between NAC18.1 and harvest date/fruit firmness.
    • Achieved predictive accuracies > 0.46 for harvest time and fruit size using genomic prediction.

    Conclusions:

    • Genetic structure of domesticated apples reflects ripening time.
    • Rapid linkage disequilibrium (LD) decay in apples necessitates millions of SNPs for GWAS but enables high-resolution mapping.
    • Findings hold significant potential for advancing MAS in apple breeding.