MATHIEU, Laura; CHLOUP, Amandine; MARTY, Soline; SAVAJOLS, Justin; ROUVEYROL, Claudia; VALLS, Josep; PÉTRIACQ, Pierre; MOREL, Jean-Benoît; MÉTEIGNIER, Louis Valentin; BALLINI, Elsa

doi:10.1101/2025.07.30.667709

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MATHIEU, Laura
Plant Health Institute of Montpellier [UMR PHIM]

CHLOUP, Amandine
Plant Health Institute of Montpellier [UMR PHIM]

MARTY, Soline
Plant Health Institute of Montpellier [UMR PHIM]

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Document de travail - Pré-publication

Ce document a été publié dans

2025-08-02

Résumé en anglais

The interactions between co-cultivated plant cultivars are increasingly recognized as influencing their susceptibility to pathogens in mixtures. However, the underlying mechanisms remain largely unexplored. Using a model of durum wheat cultivar mixtures where susceptibility to Septoria foliar disease is increased, we combined aerial and root phenotyping with transcriptional analyses and untargeted metabolomics to elucidate the potential signaling cascade driving this modulation of susceptibility. We observed contrasting root architectures between cultivars in mixture. Molecular analysis showed a delayed induction of defense-related genes and metabolites following pathogen inoculation in plants grown in mixture compared to pure stand. The findings suggest that root architecture potentially triggers a competitive response that could delay the induction of defense responses following pathogen inoculation. Altogether, these results point to a possible interplay between root architecture, resource competition, plant metabolism, and defense modulation in shaping plant–pathogen interactions within varietal mixtures.< Réduire

Mots clés en anglais

Durum wheat

Triticum turgidum

Septoria tritici blotch

varietal mixtures

plant-plant interactions

belowground processes

competition

DOI

http://dx.doi.org/10.1101/2025.07.30.667709

Project ANR

Mobilizing and Breeding Intra and inter-specific crop Diversity for a systemic change towards pesticide-free agriculture - ANR-20-PCPA-0006
Analyse du compromis croissance/défense chez le blé dur - ANR-19-CE20-0005

Origine

Importé de hal

Unités de recherche

Biologie du Fruit & Pathologie (BFP) - UMR 1332