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Université de Fribourg

Protein phosphatase AP2C1 negatively regulates basal resistance and defense responses to Pseudomonas syringae

Shubchynskyy, Volodymyr ; Boniecka, Justyna ; Schweighofer, Alois ; Simulis, Justinas ; Kvederaviciute, Kotryna ; Stumpe, Michael ; Mauch, Felix ; Balazadeh, Salma ; Mueller-Roeber, Bernd ; Boutrot, Freddy ; Zipfel, Cyril ; Meskiene, Irute

In: Journal of Experimental Botany, 2017, p. -

Mitogen-activated protein kinases (MAPKs) mediate plant immune responses to pathogenic bacteria. However, less is known about the cell autonomous negative regulatory mechanism controlling basal plant immunity. We report the biological role of Arabidopsis thaliana MAPK phosphatase AP2C1 as a negative regulator of plant basal resistance and defense responses to Pseudomonas syringae. AP2C2, a...

Université de Fribourg

The glutaredoxin ATGRXS13 is required to facilitate Botrytis cinerea infection of Arabidopsis thaliana plants

Camera, Sylvain La ; L’Haridon, Floriane ; Astier, Jérémy ; Zander, Mark ; Abou-Mansour, Eliane ; Page, Gonzague ; Thurow, Corinna ; Wendehenne, David ; Gatz, Christiane ; Métraux, Jean-Pierre ; Lamotte, Olivier

In: The Plant Journal, 2011, vol. 68, no. 3, p. 507–519

Botrytis cinerea is a major pre- and post-harvest necrotrophic pathogen with a broad host range that causes substantial crop losses. The plant hormone jasmonic acid (JA) is involved in the basal resistance against this fungus. Despite basal resistance, virulent strains of B. cinerea can cause disease on Arabidopsis thaliana and virulent pathogens can interfere with the metabolism of the host in a...

Université de Fribourg

Insect eggs suppress plant defence against chewing herbivores

Bruessow, Friederike ; Gouhier-Darimont, Caroline ; Buchala, Antony J. ; Metraux, Jean-Pierre ; Reymond, Philippe

In: The Plant Journal, 2010, vol. 62, no. 5, p. 876 - 885

Plants activate direct and indirect defences in response to insect egg deposition. However, whether eggs can manipulate plant defence is unknown. In Arabidopsis thaliana, oviposition by the butterfly Pieris brassicae triggers cellular and molecular changes that are similar to the changes caused by biotrophic pathogens. In the present study, we found that the plant defence signal salicylic acid...

Université de Fribourg

Salicylic acid production in response to biotic and abiotic stress depends on isochorismate in Nicotiana benthamiana

Catinot, Jérémy ; Buchala, Antony ; Abou-Mansour, Eliane ; Métraux, Jean-Pierre

In: Febs Letters, 2008, vol. 582, no. 4, p. 473-478

Salicylic acid (SA) is an important signal involved in the activation of defence responses against abiotic and biotic stress. In tobacco, benzoic acid or glucosyl benzoate were proposed to be precursors of SA. This is in sharp contrast with studies in Arabidopsis thaliana, where SA derives from isochorismate. We have determined the importance of isochorismate for SA biosynthesis in Nicotiana...

Université de Fribourg

Benzothiadiazole induces the accumulation of phenolics and improves resistance to powdery mildew in strawberries

Hukkanen, Anne T. ; Kokko, Harri I. ; Buchala, Antony J. ; McDougall, Gordon J. ; Stewart, Derek ; Kärenlampi, Sirpa O. ; Karjalainen, Reijo O.

In: Journal of Agricultural and Food Chemistry, 2007, vol. 55, no. 5, p. 1862 -1870

Benzothiadiazole (BTH) enhanced the accumulation of soluble and cell-wall-bound phenolics in strawberry leaves and also improved the resistance to powdery mildew infection under greenhouse conditions. The most pronounced change was seen in the levels of ellagitannins, which increased up to 2- to 6-fold 4 days after the BTH application, but persisted only in the inoculated plants. The induction of...

Université de Fribourg

Priming: getting ready for battle

Conrath, Uwe ; Beckers, Gerold J. M. ; Flors, Victor ; García-Agustín, Pilar ; Jakab, Gábor ; Mauch, Felix ; Newman, Mari-Anne ; Pieterse, Corné M. J. ; Poinssot, Benoit ; Pozo, María J. ; Pugin, Alain ; Schaffrath, Ulrich ; Ton, Jurriaan ; Wendehenne, David ; Zimmerli, Laurent ; Mauch-Mani, Brigitte

In: Molecular Plant-Microbe Interactions, 2006, vol. 19, no. 10, p. 1062–1071

Infection of plants by necrotizing pathogens or colonization of plant roots with certain beneficial microbes causes the induction of a unique physiological state called “priming.” The primed state can also be induced by treatment of plants with various natural and synthetic compounds. Primed plants display either faster, stronger, or both activation of the various cellular defense responses...

Université de Fribourg

Genetic evidence that expression of NahG modifies defence pathways independent of salicylic acid biosynthesis in the Arabidopsis–Pseudomonas syringae pv. tomato interaction

Heck, Silvia ; Grau, Theres ; Buchala, Antony ; Métraux, Jean-Pierre ; Nawrath, Christiane

In: The Plant Journal, 2003, vol. 36(3), p. 342

The salicylic acid (SA)-induction deficient (sid) mutants of Arabidopsis, eds5 and sid2 accumulate normal amounts of camalexin after inoculation with Pseudomonas syringae pv. tomato (Pst), while transgenic NahG plants expressing an SA hydroxylase that degrades SA have reduced levels of camalexin and exhibit a higher susceptibility to different...

Université de Fribourg

Characterization of Arabidopsis enhanced disease susceptibility mutants that are affected in systemically induced resistance

Ton, Jurriaan ; Vos, Martin De ; Robben, Charlotte ; Buchala, Anthony ; Métraux, Jean-Pierre ; Loon, L. C. Van ; Pieterse, Corné M. J.

In: The Plant Journal, 2002, vol. 29(1), p. 11

In Arabidopsis, the rhizobacterial strain Pseudomonas fluorescens WCS417r triggers jasmonate (JA)- and ethylene (ET)-dependent induced systemic resistance (ISR) that is effective against different pathogens. Arabidopsis genotypes unable to express rhizobacteria-mediated ISR against the bacterial pathogen Pseudomonas syringae pv. tomato DC3000 (Pst DC3000)...