Impact of the introgression of resistance loci on agro-œnological traits in grapevine interspecific hybrids

  1. E. Chedid
  2. C. Rustenholz
  3. K. Avia
  4. V. Dumas
  5. D. Merdinoglu
  6. É. Duchêne
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Abstract

  • A major aim in modern grapevine ( Vitis vinifera L.) breeding programs is the introgression of disease resistance genes along with desired cultural and œnological traits. Understanding the genetic links between resistance genes and agro-œnological traits is a crucial issue for grapevine breeders.

  • We studied the genetic determinism of a wide range of agro-oenological traits in a complex interspecific hybrid population and identified two cases of colocalizations with disease resistance quantitative trait loci (QTL).

  • The species of origin of chromosomal regions in the off-springs were determined thanks to in silico chromosome painting. The linkage drag around resistance genes from primary gene pool was assessed as low due to a good recombination rate with V. vinifera .

  • We established that wild Vitis species are, apart from their interest in disease resistance, essential resources for improving the cultural characteristics of grapevine.

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  1. Version published to 10.1101/2025.03.31.646340 on bioRxiv