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Genomics assisted ancestry deconvolution in grape.

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Summary
This summary is machine-generated.

Grape breeders use wild Vitis species to improve cultivated grapes. A new method accurately estimates ancestry in hybrid grapes, aiding marker-assisted breeding for desired traits.

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Area of Science:

  • Genetics
  • Horticulture
  • Plant Breeding

Background:

  • The grapevine (Vitis) genus comprises ~60 diverse species, forming the world's most valuable horticultural crop, primarily for wine production.
  • Interspecific grape breeding has utilized wild Vitis species for over a century to enhance cultivated varieties.
  • Understanding the genetic makeup of hybrid grapes is crucial for advancing breeding programs.

Purpose of the Study:

  • To develop a principal components analysis (PCA)-based method for estimating ancestry proportions in hybrid grapes.
  • To analyze the use of wild Vitis species in breeding programs within the USDA grape germplasm collection.
  • To establish a foundation for marker-assisted breeding programs in Vitis.

Main Methods:

  • Genome-wide polymorphism data was used to develop a PCA-based ancestry estimation method.
  • Admixture proportions of hybrid grapes were calculated using this novel method.
  • The accuracy of the method was verified using simulated populations and compared with existing measures of ancestry informativeness.

Main Results:

  • Grape breeders have utilized both domesticated Vitis vinifera and wild Vitis species in backcrossing programs.
  • Accurate genome-wide ancestry estimation in interspecific Vitis hybrids is achievable with fewer than 50 ancestry informative markers (AIMs).
  • The developed method effectively deconvolutes ancestry in admixed Vitis populations.

Conclusions:

  • The ancestry deconvolution method provides a foundational tool for marker-assisted breeding in grapes.
  • This approach facilitates early-stage selection (seed or seedling) for desirable admixture profiles.
  • It enables the introgression of valuable traits from wild Vitis species while preserving elite V. vinifera characteristics.