2021/04/28 by Perrot, Sophie, Buffard, Mathilde, Andro, Céline +7
#Corky root #Porte-greffe #Resistance #Root-stock #Résistance #Tomate #Tomato
paper · doi:10.15454/ayym-7042
The aim of this project, in collaboration between GEVES and six breeding companies (HM-Clause, Gautier, Rijk Zwaan, Sakata, Syngenta, Vilmorin) was to acquire a better knowledge of this pathogen and to define a robust resistance test. A strain collection was established from literature and field isolates. Each strain was characterized for its morphology (aspect, growth), its physiology (adaptation to temperatures) and genotype. A pathogenicity test was developed to define the level of virulence of each strain and to select reference isolate. Different inoculum, conditions of tests, stages of inoculation and scoring scales were compared to define a resistance test on tomato and rootstocks controls and on a panel, defined by the steering committee, of commercial varieties with different levels of resistance. A collection of 16 characterized strains was made up and conservation conditions were defined. A resistance test and reference material (strain and controls) were validated. This new protocol was accepted as a new characteristic by CTPS for registration of varieties and will be proposed to CPVO and UPOV.