[en] Aphanomyces euteiches is an oomycete pathogen that causes the pea root rot. We investigated the potential role of early belowground defense in pea (susceptible plant) and faba bean (tolerant plant) at three days after inoculation. Pea and faba bean were inoculated with A. euteiches zoospores. Root colonization was examined. Root exudates from pea and faba bean were harvested and their impact on A. euteiches development were assessed by using in vitro assays. A. euteiches root colonization and the influence of the oomycete inoculation on specialized metabolites patterns and arabinogalactan protein (AGP) concentration of root exudates were also determined. In faba bean root, A. euteiches colonization was very low as compared with that of pea. Whereas infected pea root exudates have a positive chemotaxis index (CI) on zoospores, faba bean exudate CI was negative suggesting a repellent effect. While furanoacetylenic compounds were only detected in faba bean exudates, AGP concentration was specifically increased in pea.This work showed that early in the course of infection, host susceptibility to A. euteiches is involved via a plant-species specific root exudation opening new perspectives in pea root rot disease management.
Laloum, Yohana ; AGHYLE research unit, UP 2018.C101, UniLaSalle Rouen 3 rue du tronquet CS 40118, 76134, Mont Saint Aignan, France, Normandie Univ, UNIROUEN, Glyco-MEV, EA4358, SFR NORVEGE FED 4277, I2C Carnot, IRIB, 76000, Rouen, France
Gangneux, Christophe ; AGHYLE research unit, UP 2018.C101, UniLaSalle Rouen 3 rue du tronquet CS 40118, 76134, Mont Saint Aignan, France
Lanoue, Arnaud ; Université de Tours, EA 2106 «Biomolécules et Biotechnologies Végétales», UFR des Sciences Pharmaceutiques, 31 Av. Monge, F37200, Tours, France
Munsch, Thibaut; Université de Tours, EA 2106 «Biomolécules et Biotechnologies Végétales», UFR des Sciences Pharmaceutiques, 31 Av. Monge, F37200, Tours, France
Blum, Adrien ; Université de Liège - ULiège > Département GxABT > Plant Sciences ; AGHYLE research unit, UP 2018.C101, UniLaSalle Rouen 3 rue du tronquet CS 40118, 76134, Mont Saint Aignan, France
Gauthier, Adrien; AGHYLE research unit, UP 2018.C101, UniLaSalle Rouen 3 rue du tronquet CS 40118, 76134, Mont Saint Aignan, France
Trinsoutrot-Gattin, Isabelle ; AGHYLE research unit, UP 2018.C101, UniLaSalle Rouen 3 rue du tronquet CS 40118, 76134, Mont Saint Aignan, France
This work was supported by the research network SFR NORVEGE of Normandy region in the Give Peas a Chance project , the French ministry of Research and Higher Education and the University of Rouen Normandy . YL was supported by a PhD fellowship from the Normandy Region .
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