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Université de Fribourg

Comparative mutant analysis of Arabidopsis ABCC-type ABC transporters: AtMRP2 contributes to detoxification, vacuolar organic anion transport and chlorophyll degradation

Frelet-Barrand, Annie ; Kolukisaoglu, H. Üner ; Plaza, Sonia ; Rüffer, Maika ; Azevedo, Louis ; Hörtensteiner, Stefan ; Marinova, Krasimira ; Weder, Barbara ; Schulz, Burkhard ; Klein, Markus

In: Plant and Cell Physiology, 2008, vol. 

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...

Université de Fribourg

The PP2C-type phosphatase AP2C1, which negatively regulates MPK4 and MPK6, modulates innate immunity, jasmonic acid, and ethylene levels in Arabidopsis

Schweighofer, Alois ; Kazanaviciute, Vaiva ; Scheikl, Elisabeth ; Teige, Markus ; Doczi, Robert ; Hirt, Heribert ; Schwanninger, Manfred ; Kant, Merijn ; Schuurink, Robert ; Mauch, Felix ; Buchala, Antony ; Cardinale, Francesca ; Meskiene, Irute

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...

Université de Neuchâtel

Salicylic Acid and Systemic Acquired Resistance to Pathogen Attack

Mauch-Mani, Brigitte ; Métraux, Jean-Pierre

In: Annals of Botany, 1998, vol. 82, no. 5, p. 535-540

New insights into the phenomenon of systemic acquired resistance have been gained in recent years, by the use of techniques in molecular genetics and biology that have replaced the largely descriptive approach of earlier work. The isolation of mutants in the signal transduction pathway from induction to expression of resistance as well as the use of transgenic plants over-expressing or...

Université de Neuchâtel

Functional study of vacular sorting receptors in transgenic "Arabidopsis thaliana" plants

Okmeni Nguemelieu, Jeannine ; Neuhaus, Jean-Marc (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2006 ; Th. 1963.

Fusion of the Green Fluorescence protein (GFP) to propeptides of different vacuolar proteins like barley aleurain and tobacco chitinase allowed to visualize two different vacuolar compartments with different sizes in different tissues. These propeptides contain vacuolar sorting determinant (VSD) of two different types: sequence-specific (aleurain) and C-terminal (chitinase). These VSDs are...

Université de Fribourg

Effect of sulfur deficiency on the resistance of oilseed rape to fungal pathogens and expression profiling of the glutathione S-transferase family of "Arabidopsis thaliana"

Dubuis, Pierre-Henri ; Mauch, Felix (Dir.)

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...

Université de Fribourg

Cuticular defects lead to full immunity to a major plant pathogen

Chassot, Céline ; Nawrath, Christiane ; Métraux, Jean-Pierre

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...

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 Neuchâtel

β-amino-butyric acid-induced resistance against necrotrophic pathogens is based on ABA-dependent priming for callose

Ton, Jurriaan ; Mauch-Mani, Brigitte

In: The Plant Journal, 2004, vol. 38, no. 1, p. 119-130

The non-protein amino acid β-amino-butyric acid (BABA) protects plants against a wide range of pathogens. We have examined the effectiveness and mode of action of BABA on resistance against two necrotrophic pathogens. Treatment of Arabidopsis with BABA induced resistance against Alternaria brassicicola and Plectosphaerella cucumerina to a similar level by jasmonic acid (JA)....

Université de Neuchâtel

Characterization of an Arabidopsis–Phytophthora Pathosystem: resistance requires a functional PAD2 gene and is independent of salicylic acid, ethylene and jasmonic acid signalling

Roetschi, Alexandra ; Si-Ammour, Azeddine ; Belbahri, Lassaâd ; Mauch, Felix ; Mauch-Mani, Brigitte

In: The Plant Journal, 2001, vol. 28, no. 2, p. 293-305

Arabidopsis accessions were screened with isolates of Phytophthora porri originally isolated from other crucifer species. The described Arabidopsis–Phytophthora pathosystem shows the characteristics of a facultative biotrophic interaction similar to that seen in agronomically important diseases caused by Phytophthora species. In susceptible accessions, extensive...