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Plant immunity: metabolomic characterization of peaand faba bean root exudates
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Edité par CCSD -
National audience. Legume crops are interesting for both the nutritional quality of their seeds and thenatural nitrogen fertilization of soils. Pea remains the major legume crop in France, even if itsproduction declines due to root rot caused by the pathogen Aphanomyces euteiches. Theinfection can result in yield losses of up to 80% in peas [1] while faba bean cultivars are lesssusceptible to this pathogen. There is no effective protection against this disease other thancrop rotation. To develop new control methods, it is thus necessary to better understand theinfectious process and the establishment of plant defenses. Given that a recent studyrevealed that faba root exudates alter pea root colonization [2], our objective is to comparethe compounds emitted by the pea and faba roots using an untargeted metabolomicsapproach.Pea and faba seedlings were hydroponically grown, and root exudates were harvestedand analyzed by NMR. The obtained exudation profiles are characteristic of each specieseven if there are variations within the same variety, in particular regarding compoundconcentrations. Spectra annotation shows an enrichment of faba exudates in sugars, andpeas in amino acids. However, many of the compositional differences noted between peaand faba exudates correspond to unidentified metabolites. Additional analyzes are necessaryto identify which metabolites provide faba root protection against A. euteiches, and toconsider the development of pea resistance.References1. Gaulin et al. (2007) Molecular Plant Pathology 8(5):539-548.2. Laloum et al. (2021) Plant Science 312:111032.
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