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Poster communications

Plant immunity: metabolomic characterization of pea and faba bean root exudates

Abstract : Legume crops are interesting for both the nutritional quality of their seeds and the natural nitrogen fertilization of soils. Pea remains the major legume crop in France, even if its production declines due to root rot caused by the pathogen Aphanomyces euteiches. The infection can result in yield losses of up to 80% in peas [1] while faba bean cultivars are less susceptible to this pathogen. There is no effective protection against this disease other than crop rotation. To develop new control methods, it is thus necessary to better understand the infectious process and the establishment of plant defenses. Given that a recent study revealed that faba root exudates alter pea root colonization [2], our objective is to compare the compounds emitted by the pea and faba roots using an untargeted metabolomics approach. Pea and faba seedlings were hydroponically grown, and root exudates were harvested and analyzed by NMR. The obtained exudation profiles are characteristic of each species even if there are variations within the same variety, in particular regarding compound concentrations. Spectra annotation shows an enrichment of faba exudates in sugars, and peas in amino acids. However, many of the compositional differences noted between pea and faba exudates correspond to unidentified metabolites. Additional analyzes are necessary to identify which metabolites provide faba root protection against A. euteiches, and to consider the development of pea resistance. References 1. Gaulin et al. (2007) Molecular Plant Pathology 8(5):539-548. 2. Laloum et al. (2021) Plant Science 312:111032.
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https://hal-normandie-univ.archives-ouvertes.fr/hal-03529908
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Submitted on : Monday, January 17, 2022 - 4:58:22 PM
Last modification on : Wednesday, March 2, 2022 - 5:24:03 PM

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  • HAL Id : hal-03529908, version 1

Citation

Mélanie Fortier, Julie Lemyre, Edouard Ancelin, Hassan Oulyadi, Marie-Laure Follet-Gueye, et al.. Plant immunity: metabolomic characterization of pea and faba bean root exudates. 14ème journées scientifiques du RFMF, Nov 2021, Aussois, France. ⟨hal-03529908⟩

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