Leptosphaeria maculans effector AvrLm4-7 affects SA- and ET-signalling and H2O2 accumulation in Brassica napus - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Molecular Plant Pathology Année : 2016

Leptosphaeria maculans effector AvrLm4-7 affects SA- and ET-signalling and H2O2 accumulation in Brassica napus

Résumé

To achieve host colonization, successful pathogens need to overcome plant basal defences. For this, (hemi) biotrophic pathogens secrete effectors that interfere with a range of physiological processes of the host plant. AvrLm4-7 is one of the cloned effectors from the hemibiotrophic fungus Leptosphaeria maculans ‘brassicaceae’ infecting mainly oilseed rape (Brassica napus). Although its mode of action is still unknown, AvrLm4-7 is strongly involved in L. maculans virulence. Here, we investigated the effect of AvrLm4-7 on plant defence responses in a susceptible cultivar of B. napus. Using two isogenic L. maculans isolates differing in the presence of a functional AvrLm4-7 allele [absence (‘a4a7’) and presence (‘A4A7’) of the allele], the plant hormone concentrations, defence-related gene transcription and reactive oxygen species (ROS) accumulation were analysed in infected B. napus cotyledons. Various components of the plant immune system were affected. Infection with the ‘A4A7’ isolate caused suppression of salicylic acid- and ethylene-dependent signalling, the pathways regulating an effective defence against L. maculans infection. Furthermore, ROS accumulation was decreased in cotyledons infected with the ‘A4A7’ isolate. Treatment with an antioxidant agent, ascorbic acid, increased the aggressiveness of the ‘a4a7’ L. maculans isolate, but not that of the ‘A4A7’ isolate. Together, our results suggest that the increased aggressiveness of the ‘A4A7’ L. maculans isolate could be caused by defects in ROSdependent defence and/or linked to suppressed SA and ET signalling. This is the first study to provide insights into the manipulation of B. napus defence responses by an effector of L. maculans.

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hal-01531656 , version 1 (01-06-2017)

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Miroslava Nováková, Lucie Trdá, Hana Krutinová, Thomas Mongin, Olga Valentová, et al.. Leptosphaeria maculans effector AvrLm4-7 affects SA- and ET-signalling and H2O2 accumulation in Brassica napus. Molecular Plant Pathology, 2016, 17 (6), pp.818-831. ⟨10.1111/mpp.12332⟩. ⟨hal-01531656⟩
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