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INRA
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31326 Castanet Tolosan CEDEX - France

Dernière mise à jour : Mai 2018

Menu Logo Principal Institut Agro Rennes-Angers Angers University   IRHS

IRHS

Genetics and genomics of ornamental traits

We are particularly interested in development (architecture, flowering) and biotic stresses (leaf diseases including black spot). Within the framework of national and international collaborations, we address the genetic determinism of fragrance production, duplication and presence of spines..

A quantitative genetic approach is being developed to study the genetic determinism of flowering (date and rise of flowering) (in collaboration with the  team   VALEMA),pathogen resistance ( with EcoFun, Végépolys valley, the FNPHP and the University of Hanover (Germany)), floral development, perfume production (with BvPAM, University of St Etienne) and thorn development (in collaboration with Flower Research Institute in Kunming, China).

The genetic determinism of different phenotypic traits is studied using molecular markers (microsatellites, SNPs) on three interconnected populations of roses, resulting from inter-specific crosses, and installed in the field at UE Horti.This initial genetic mapping approach identified major genes and QTLs governing the studied traits (Table 1). Several flowering traitswere mapped (flowering date, number of petals, flowering rise) (Roman et al., 2015) architectural components (Kawamura et al., 2011, 2015) as well as fragrance production (in the  RosaScent ANR project, Magnard et al, 2015, Hibrand-Saint Oyant, Roccia et al, 2019, Sun et al, 2020).

The study of disease resistance determinism was conducted on interconnected populations (Lopez-Arias et al, 2020) and several QTLs governing thorn number were located on a high-density genetic map (Hibrand-Saint Oyant et al, 2018; Zhou et al, 2020) developed in collaboration with PRI (Wageningen) and Hanover University (Germany).

An association genetics approach (GWAS) has recently been developed on old rose collections (collaboration with la Roseraie Loubert, Rosier/Loire, France)in collaboration with PRI (Wageningen) and Hanover University (Germany). (Projet CARO – RFI Objectif Végétal).

These biological collections (F1 progeny and rose collections) are now gathered in a biological resource center (BRC) ‘Pome fruits and Roses'.

Capture d’écran 2021-06-24 à 19.11.07

 

Table 1: List of traits that were studied for the genetic determinism and interesting candidate genes that co-localized with the detected major genes or QTLs.

 

See also

Ici, les autres thématiques de l'équipe

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