Poster De Conférence Année : 2025

Disentangling different sources of peach leaf curl disease tolerance through linkage and association genetic in several peach populations

Résumé

Peach leaf curl, a fungal disease caused by the ascomycete Taphrina deformans, triggers spectacular reddish tumorous deformations on the leaves and causes massive defoliations or even the death of peach trees. To prevent significant reductions in fruit production, fruit producers mostly resort to copper based phytopharmaceuticals. Although tolerant varieties do exist, recent varieties do not bear any tolerance. This trait is certainly polygenic and genetic studies and molecular tools are needed to breed tolerant varieties. Hence, the aim of this study is to identify potential different sources of tolerance to peach leaf curl disease and characterise the various loci controlling for this trait. To do so, we bet on the combination of different analyses, populations and study sites. Symptom frequencies were recorded for at least 2 years in pesticide free orchards, on 3 different peach populations: i) a peach core-collection of 206 accessions replicated in two randomized blocs planted at four locations and genotyped with 16K IRSC peach SNP array ; ii) the ‘Malo Konare’ population composed by 212 hybrids coming from a selfing of ‘Malo Konare’, a Bulgarian cultivar planted at one location ; iii) a progeny obtained from a P. davidiana x P. persica pseudo-backcross composed of 123 hybrids replicated in one to two randomized blocs at two locations. The two latter were genotyped with IPSC peach 9K SNP array v1. Multisite and multiyear genome wide association study (GWAS) is implemented on the core-collection dataset while QTL detection is performed on the progeny datasets. Several tolerance QTLs were detected. The next objectives will be i) to set up marker assisted selection methodology to support the integration of leaf curl tolerance into peach breeding programs and ii) to test the impact of accumulation of different factors on the global level of tolerance of a variety and its durability.

Fichier principal
Vignette du fichier
Poster_RGC12_Clotilde.pdf (2.03 Mo) Télécharger le fichier
Origine Fichiers produits par l'(les) auteur(s)
Licence

Dates et versions

hal-05065082 , version 1 (13-05-2025)

Licence

Identifiants

  • HAL Id : hal-05065082 , version 1

Citer

Clotilde Nigon, Naïma Dlalah, Luana Gillet, Sabrina Viret, Frédéric Gilles, et al.. Disentangling different sources of peach leaf curl disease tolerance through linkage and association genetic in several peach populations. 12th Rosaceae Genomic Conference (RGC12), May 2025, Sant Feliu de Guíxols, Spain. ⟨hal-05065082⟩
101 Consultations
85 Téléchargements

Partager

  • More