Université de Fribourg

Regulatory and functional aspects of indolic metabolism in plant systemic acquired resistance

Stahl, Elia ; Bellwon, Patricia ; Huber, Stefan ; Schlaeppi, Klaus ; Bernsdorff, Friederike ; Vallat-Michel, Armelle ; Mauch, Felix ; Zeier, Jürgen

In: Molecular Plant, 2016, p. -

Tryptophan-derived, indolic metabolites possess diverse functions in Arabidopsis innate immunity to microbial pathogen infection. Here, we investigate the functional role and regulatory characteristics of indolic metabolism in Arabidopsis systemic acquired resistance (SAR) triggered by the bacterial pathogen Pseudomonas syringae. Indolic metabolism is broadly activated in both P....

Université de Fribourg

Pipecolic acid, an endogenous mediator of defense amplification and priming, is a critical regulator of inducible plant immunity

Návarová, Hana ; Bernsdorff, Friederike ; Döring, Anne-Christin ; Zeier, Jürgen

In: The Plant Cell, 2012, p. -

Metabolic signals orchestrate plant defenses against microbial pathogen invasion. Here, we report the identification of the non-protein amino acid pipecolic acid (Pip), a common Lys catabolite in plants and animals, as a critical regulator of inducible plant immunity. Following pathogen recognition, Pip accumulates in inoculated Arabidopsis thaliana leaves, in leaves distal from the site of...

Université de Fribourg

Post-translational derepression of invertase activity in source leaves via down-regulation of invertase inhibitor expression is part of the plant defense response

Bonfig, Katharina B. ; Gabler, Andrea ; Simon, Uwe K. ; Luschin-Ebengreuth, Nora ; Hatz, Martina ; Berger, Susanne ; Muhammad, Naseem ; Zeier, Jürgen ; Sinha, Alok K. ; Roitsch, Thomas

In: Molecular Plant, 2010, p. -

There is increasing evidence that pathogens do not only elicit direct defense responses, but also cause pronounced changes in primary carbohydrate metabolism. Cell-wall-bound invertases belong to the key regulators of carbohydrate partitioning and source-sink relations. Whereas studies have focused so far only on the transcriptional induction of invertase genes in response to pathogen infection,...

Université de Fribourg

A role for β-sitosterol to stigmasterol conversion in plant–pathogen interactions

Griebel, Thomas ; Zeier, Jürgen

In: The Plant Journal, 2010, vol. 63, no. 2, p. 254–268

Upon inoculation with pathogenic microbes, plants induce an array of metabolic changes that potentially contribute to induced resistance or even enhance susceptibility. When analysing leaf lipid composition during the Arabidopsis thaliana–Pseudomonas syringae interaction, we found that accumulation of the phytosterol stigmasterol is a significant plant metabolic process that occurs upon...

Université de Fribourg

Methyl salicylate production and jasmonate signaling are not essential for systemic acquired resistance in Arabidopsis

Attaran, Elham ; Zeier, Tatiana E. ; Griebel, Thomas ; Zeier, Jürgen

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...

Université de Fribourg

Pseudomonas syringae Elicits Emission of the Terpenoid (E,E)-4,8,12-Trimethyl-1,3,7,11-Tridecatetraene in Arabidopsis Leaves Via Jasmonate Signaling and Expression of the Terpene Synthase TPS4

Attaran, Elham ; Rostás, Michael ; Zeier, Jürgen

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...

Université de Fribourg

Light regulation and daytime dependency of inducible plant defences in Arabidopsis: phytochrome signalling controls systemic acquired resistance rather than local defence

Griebel, Thomas ; Zeier, Jürgen

In: Plant Physiology, 2008, vol. 147, p. 790-801

We have examined molecular and physiological principles underlying the light-dependency of defence activation in Arabidopsis plants challenged with the bacterial pathogen Pseudomonas syringae. Within a fixed light/dark cycle, plant defence responses and disease resistance significantly depend on the time of day when pathogen contact takes place. Morning and midday inoculations result in...