2021/04/29 by Laurent Cassan, Cassan, Laurent, M. Benigni +13
Agricultural and Biological Sciences · Nursing · #Agriculture, Plant Science, Crop Management #Art #Biology #Botany #C intybus #Cichorium endivia #Genetic resources #Humanities #Microbial Metabolites in Food Biotechnology #Phytophthora #Phytophthora cryptogea Pag3 #Plant Pathogens and Resistance #Resistance #Ressources génétiques #Résistance #Sclerotinia sclerotiorum
paper · open access · doi:10.15454/7b6n-3x78
published in HAL (Le Centre pour la Communication Scientifique Directe) (Centre National de la Recherche Scientifique)
openalex publication_date 2021/04/29 · openalex created_date 2022/09/28 · openalex updated_date 2026/07/15
This project aimed at the search for genetic resistance, firstly towards Sclerotinia sclerotiorum, an extremely polyphagous pathogen, in the leafy salads group (Cichorium endivia) and in witloof (Cichorium intybus), and secondly to the most aggressive strains (Pag3) of the oomycete Phytophthora cryptogea specifically in witloof. To achieve this, the diversity of genetic resources (GR) of the two species of chicory was explored through early assessment of seedling susceptibility to both pathogens in laboratory conditions, and application of a reliable sensitivity assessment protocol for mature plants. In the first place, the test of sensitivity/tolerance against S. sclerotiorum established on seedlings, made it possible to screen plant material upstream of the field tests whose protocol was specified. Accessions, identified as sensitive or tolerant, showed stable behavior in field and laboratory tests. They may now be used as evaluation references for other GRs. Secondly, the susceptibility test towards P. cryptogea Pag3 showed too much variation on seedlings and must be reinforced. Within the RGs of C. intybus, partial resistance exists in all types, and particularly in ancient witloof accessions that should be re-evaluated. In the long term, beyond the protocols and tools developed, this work will contribute to a better knowledge of the structure of chicory RGs and will make it possible to broaden the genetic basis of cultivated varieties