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Université de Fribourg

NPR1 modulates cross-talk between salicylate- and jasmonate-dependent defense pathways through a novel function in the cytosol

Spoel, Steven H. ; Koornneef, Annemart ; Claessens, Susanne M. C. ; Korzelius, Jerôme P. ; Pelt, Johan A. van ; Mueller, Martin J. ; Buchala, Antony J. ; Métraux, Jean-Pierre ; Brown, Rebecca ; Kazan, Kemal ; Loon, L. C. van ; Dong, Xinnian ; Pieterse, Corné M. J.

In: The Plant Cell, 2003, vol. 15, p. 760

Plant defenses against pathogens and insects are regulated differentially by cross-communicating signal transduction pathways in which salicylic acid (SA) and jasmonic acid (JA) play key roles. In this study, we investigated the molecular mechanism of the antagonistic effect of SA on JA signaling. Arabidopsis plants unable to accumulate SA produced 25-fold higher levels of JA and showed enhanced...

Université de Fribourg

Phytochrome signalling modulates the SA-perceptive pathway in Arabidopsis

Genoud, Thierry ; Buchala, Antony J. ; Chua, Nam-Hai ; Métraux, Jean-Pierre

In: The Plant Journal, 2002, vol. 31(1), p. 87

The interaction of phytochrome signalling with the SA signal transduction pathway has been investigated in Arabidopsis using single and multiple mutants affected in light perception (phyA and phyB deficient) and light-signal processing (psi2, phytochrome signalling). The induction of PR1 by SA and functional analogues has been found to strictly correlate with the activity of...

Université de Fribourg

Rhizobacteria-mediated induced systemic resistance (ISR) in Arabidopsis requires sensitivity to jasmonate and ethylene but is not accompanied by an increase in their production

Pieterse, Corné M. J. ; Pelt, Johan A. van ; Ton, Jurriaan ; Parchmann, Stefanie ; Mueller, Martin J. ; Buchala, Antony J. ; Métraux, Jean-Pierre ; Loon, Leendert C. van

In: Physiological and Molecular Plant Pathology, 2000, vol. 57(3), p. 123

Plants develop an enhanced defensive capacity against a broad spectrum of plant pathogens after colonization of the roots by selected strains of nonpathogenic biocontrol bacteria. In Arabidopsis thaliana, this induced systemic resistance (ISR) functions independently of salicylic acid but requires an intact response to the plant hormones jasmonic acid (JA) and ethylene. To further...

Université de Fribourg

Signal signature and transcriptome changes of Arabidopsis during pathogen and insect attack

Vos, Martin de ; Oosten, Vivian R. van ; Poecke, Remco M. P. van ; Pelt, Johan A. van ; Pozo, Maria J. ; Mueller, Martin J. ; Buchala, Antony J. ; Métraux, Jean-Pierre ; Loon, L. C. van ; Dicke, Marcel ; Pieterse, Corné M. J.

In: Molecular Plant-Microbe Interactions, 2005, vol. 18, p. 923

Plant defenses against pathogens and insects are regulated differentially by cross-communicating signaling pathways in which salicylic acid (SA), jasmonic acid (JA), and ethylene (ET) play key roles. To understand how plants integrate pathogen- and insect-induced signals into specific defense responses, we monitored the dynamics of SA, JA, and ET signaling in Arabidopsis after attack by a...

Université de Fribourg

Enhancing Arabidopsis salt and drought stress tolerance by chemical priming for its abscisic acid responses

Jakab, Gabor ; Ton, Jurriaan ; Flors, Victor ; Zimmerli, Laurent ; Métraux, Jean-Pierre ; Mauch-Mani, Brigitte

In: Plant Physiology, 2005, vol. 139, p. 267

Drought and salt stress tolerance of Arabidopsis (Arabidopsis thaliana) plants increased following treatment with the nonprotein amino acid β-aminobutyric acid (BABA), known as an inducer of resistance against infection of plants by numerous pathogens. BABA-pretreated plants showed earlier and higher expression of the salicylic acid-dependent PR-1 and PR-5 and the...

Université de Fribourg

Analysis of pathogen-induced glutathione S-transferases in Arabidopsis thaliana and a gene related to systemic acquired resistance in cucumber (Cucumis sativus L.)

Lieberherr, Damien ; Métraux, Jean-Pierre (Dir.)

Thèse de doctorat : Université de Fribourg, 2001 ; no 1338.

In response to infection by pathogens, plants deploy various and complex defense mechanisms. Resistance can be expressed locally and systemically, depending on the nature of the inducing stimulus. For instance, after infection by a necrotizing pathogen, resistance develops throughout the plants, in tissues distant from the initial site of infection. This form of resistance, called systemic...

Université de Lausanne

Combined transcriptomic and proteomic studies reveal non-canonical signaling functions in the jasmonate pathway

Liechti, Robin ; Farmer, Edward (Dir.)

Thèse de doctorat : Université de Lausanne, 2005.

Lipid derived signals mediate many stress and defense responses in multicellular euka eukaryotes. Among these are the jasmonates, potently active signaling compounds in plants. Jasmonic acid (JA) and 12-oxo-phytodienoic acid (OPDA) are the two best known members of the large jasmonate family. This thesis further investigates their roles as signals using genomic and proteomic approaches. The study...

Université de Fribourg

Arabidopsis-Phytophthora, un pathosystème modèle pour la caractérisation d'une interaction entre une plante et un pathogène oomycète

Roetschi, Alexandra ; Mauch, Felix (Dir.) ; Gisi, Ulrich (Codir.) ; Métraux, Jean-Pierre (Codir.)

Thèse de doctorat : Université de Fribourg, 2001 ; no 1345.

Oomycetes are pathogens responsible for many plant diseases over the world and the economical impact of their damage is quite important. Although these organisms show a mycelar growth, their biology is quite different from that of fungi. This makes them not easy to fight against and up to now no fungicide is able to stop an epidemy due to Oomycetes in a durable way. The particular biology of...

Université de Fribourg

Molecular analysis of the arabidopsis-Phytophthora pathosystem

Si-Ammour, Azeddine ; Mauch, Felix (Dir.) ; Métraux, Jean-Pierre (Codir.)

Thèse de doctorat : Université de Fribourg, 2002 ; No 1370.

In order to better understand the Phytophthora-plant interaction, we have developed a new pathosystem: Arabidopsis thaliana-Phytophthora porri. At present, the best studied Phytophthora species is P. infestans which caused the dramatic Irish late blight epidemics 150 years ago. Studying the pathosystem Phytophthora infestans-Solanum tuberosum has certain advantages mainly because potato is an...

Université de Fribourg

Dissecting the ß-aminobutyric acid–induced priming phenomenon in Arabidopsis

Ton, Jurriaan ; Jakab, Gabor ; Toquin, Valérie ; Flors, Victor ; Iavicoli, Annalisa ; Maeder, Muriel N. ; Métraux, Jean-Pierre ; Mauch-Mani, Brigitte

In: The Plant Cell, 2005, vol. 17, p. 987-999

Plants treated with the nonprotein amino acid ß-aminobutyric acid (BABA) develop an enhanced capacity to resist biotic and abiotic stresses. This BABA-induced resistance (BABA-IR) is associated with an augmented capacity to express basal defense responses, a phenomenon known as priming. Based on the observation that high amounts of BABA induce sterility in Arabidopsis thaliana, a mutagenesis...