In: The Plant Cell, 2009, vol. 21, p. 954-971
Systemic acquired resistance (SAR) develops in response to local microbial leaf inoculation and renders the whole plant more resistant to subsequent pathogen infection. Accumulation of salicylic acid (SA) in noninfected plant parts is required for SAR, and methyl salicylate (MeSA) and jasmonate (JA) are proposed to have critical roles during SAR long-distance signaling from inoculated to distant...
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In: Molecular Plant-Microbe Interactions, 2008, vol. 21, no. 11, p. 1482-1497
Volatile, low–molecular weight terpenoids have been implicated in plant defenses, but their direct role in resistance against microbial pathogens is not clearly defined. We have examined a possible role of terpenoid metabolism in the induced defense of Arabidopsis thaliana plants against leaf infection with the bacterial pathogen Pseudomonas syringae. Inoculation of plants with...
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In: The Plant Journal, 2008///doi:10.1111/j.1365-313X.2008.03540.x
Physical injury inflicted on living tissue makes it vulnerable to invasion by pathogens. Wounding of Arabidopsis thaliana leaves, however, does not conform to this concept and leads to immunity to Botrytis cinerea, the causal agent of grey mould. In wounded leaves, hyphal growth was strongly inhibited compared to unwounded controls. Wound-induced resistance was not associated with salicylic...
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In: Plant Physiology, 2009, p. -
Salicylic acid (SA) is an important mediator of plant defense response. In Arabidopsis thaliana, this compound was proposed to derive mainly from isochorismate, itself produced from chorismate through the activity of ICS1 (Isochorismate Synthase1). Null ics1 mutants still accumulate some SA, suggesting the existence of an enzymatic activity redundant with ICS1 or of an alternative...
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In: Plant and Cell Physiology, 2008, vol. 49, no. 4, p. 557-569
The enormous metabolic plasticity of plants allows detoxification of many harmful compounds that are generated during biosynthetic processes or are present as biotic or abiotic toxins in their environment. Derivatives of toxic compounds such as glutathione conjugates are moved into the central vacuole via ATP-binding cassette (ABC)-type transporters of the multidrug resistance-associated protein...
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In: Molecular Plant-Microbe Interactions, 2007, vol. 20, no. 12, p. 1535-1544
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In: The Plant Cell, 2007, vol. 19, no. 7, p. 2213-2224
Wound signaling pathways in plants are mediated by mitogen-activated protein kinases (MAPKs) and stress hormones, such as ethylene and jasmonates. In Arabidopsis thaliana, the transmission of wound signals by MAPKs has been the subject of detailed investigations; however, the involvement of specific phosphatases in wound signaling is not known. Here, we show that AP2C1, an...
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Thèse de doctorat : Université de Fribourg, 2004 ; no 1442.
La réduction de la pollution atmosphérique due au dioxyde de soufre a provoqué au début des années nonante des problèmes de carence de soufre dans les champs principalement au nord de l’Europe. Le soufre est un macroélément essentiel pour le développement de la plante. Des composés soufrés tels que des protéines riches en soufre, des phytoalexines et des glucosinolates, jouent un...
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In: The Plant Journal, 2007, vol. 49, no. 6, p. 972-980
In addition to its role as a barrier, the cuticle is also a source of signals perceived by invading fungi. Cuticular breakdown products have been shown previously to be potent inducers of cutinase or developmental processes in fungal pathogens. Here the question was addressed as to whether plants themselves can perceive modifications of the cuticle. This was studied using Arabidopsis...
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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...
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