Université de Fribourg

Strigolactones play an important role in shaping exodermal morphology via a KAI2-dependent pathway

Liu, Guowei ; Stirnemann, Marina ; Gübeli, Christian ; Egloff, Susanne ; Courty, Pierre-Emmanuel ; Aubry, Sylvain ; Vandenbussche, Michiel ; Morel, Patrice ; Reinhardt, Didier ; Martinoia, Enrico ; Borghi, Lorenzo

In: iScience, 2019, vol. 17, p. 144–154

The majority of land plants have two suberized root barriers: the endodermis and the hypodermis (exodermis). Both barriers bear non-suberized passage cells that are thought to regulate water and nutrient exchange between the root and the soil. We learned a lot about endodermal passage cells, whereas our knowledge on hypodermal passage cells (HPCs) is still very scarce. Here we report on...

Université de Fribourg

VAPYRIN Marks an endosomal trafficking compartment involved in arbuscular mycorrhizal symbiosis

Bapaume, Laure ; Laukamm, Sabine ; Darbon, Geoffrey ; Monney, Corinne ; Meyenhofer, Felix ; Feddermann, Nadja ; Chen, Min ; Reinhardt, Didier

In: Frontiers in Plant Science, 2019, vol. 10, p. -

Arbuscular mycorrhiza (AM) is a symbiosis between plants and AM fungi that requires the intracellular accommodation of the fungal partner in the host. For reciprocal nutrient exchange, AM fungi form intracellular arbuscules that are surrounded by the peri-arbuscular membrane. This membrane, together with the fungal plasma membrane, and the space in between, constitute the symbiotic interface,...

Université de Fribourg

Deregulation of MADS-box transcription factor genes in a mutant defective in the WUSCHEL-LIKE HOMEOBOX gene EVERGREEN of Petunia hybrida

Schorderet, Martine ; Muni, Rajasekhara Reddy Duvvuru ; Fiebig, A. ; Reinhardt, Didier

In: Plant Signaling & Behavior, 2018, vol. 13, no. 6, p. e1471299

Angiosperm inflorescences develop in two fundamentally different ways. In monopodial plants, for example in Arabidopsis thaliana, the flowers are initiated as lateral appendages of a central indeterminate inflorescence meristem. In sympodial plants, flowers arise by terminal differentiation of the inflorescence meristem, while further inflorescence development proceeds from new sympodial...

Université de Fribourg

Beneficial services of arbuscular mycorrhizal fungi – from ecology to application

Chen, Min ; Arato, Miguel ; Borghi, Lorenzo ; Nouri, Eva ; Reinhardt, Didier

In: Frontiers in Plant Science, 2018, vol. 9, p. -

Arbuscular mycorrhiza (AM) is the most common symbiotic association of plants with microbes. AM fungi occur in the majority of natural habitats and they provide a range of important ecological services, in particular by improving plant nutrition, stress resistance and tolerance, as well as soil structure and fertility. AM fungi interact with most crop plants including cereals, vegetables, and...

Université de Fribourg

An automated confocal micro-extensometer enables in vivo quantification of mechanical properties with cellular resolution

Robinson, Sarah ; Huflejt, Michal ; Barbier de Reuille, Pierre ; Braybrook, Siobhan A. ; Schorderet, Martine ; Reinhardt, Didier ; Kuhlemeier, Cris

In: The Plant Cell, 2017, vol. 29, no. 12, p. 2959–2973

How complex developmental-genetic networks are translated into organs with specific 3D shapes remains an open question. This question is particularly challenging because the elaboration of specific shapes is in essence a question of mechanics. In plants, this means how the genetic circuitry affects the cell wall. The mechanical properties of the wall and their spatial variation are the key...

Université de Fribourg

Role of the GRAS transcription factor ATA/RAM1 in the transcriptional reprogramming of arbuscular mycorrhiza in Petunia hybrida

Rich, Mélanie K. ; Courty, Pierre-Emmanuel ; Roux, Christophe ; Reinhardt, Didier

In: BMC Genomics, 2017, vol. 18, p. 589

Development of arbuscular mycorrhiza (AM) requires a fundamental reprogramming of root cells for symbiosis. This involves the induction of hundreds of genes in the host. A recently identified GRAS-type transcription factor in Petunia hybrida, ATA/RAM1, is required for the induction of host genes during AM, and for morphogenesis of the fungal endosymbiont. To better understand the role of RAM1...

Université de Fribourg

Diet of arbuscular mycorrhizal fungi: bread and butter ?

Rich, Mélanie K. ; Nouri, Eva ; Courty, Pierre-Emmanuel ; Reinhardt, Didier

In: Trends in Plant Science, 2017, vol. 22, no. 8, p. 652–660

Most plants entertain mutualistic interactions known as arbuscular mycorrhiza (AM) with soil fungi (Glomeromycota) which provide them with mineral nutrients in exchange for reduced carbon from the plant. Mycorrhizal roots represent strong carbon sinks in which hexoses are transferred from the plant host to the fungus. However, most of the carbon in AM fungi is stored in the form of lipids....

Université de Fribourg

Insight into the evolution of the Solanaceae from the parental genomes of Petunia hybrida

Bombarely, Aureliano ; Moser, Michel ; Amrad, Avichai ; Bao, Manzhu ; Bapaume, Laure ; Barry, Cornelius S. ; Bliek, Mattijs ; Boersma, Maaike R. ; Borghi, Lorenzo ; Bruggmann, Rémy ; Bucher, Marcel ; DAgostino, Nunzio ; Davies, Kevin ; Druege, Uwe ; Dudareva, Natalia ; Egea-Cortines, Marcos ; Delledonne, Massimo ; Fernandez-Pozo, Noe ; Franken, Philipp ; Grandont, Laurie ; Heslop-Harrison, J. S. ; Hintzsche, Jennifer ; Johns, Mitrick ; Koes, Ronald ; Lv, Xiaodan ; Lyons, Eric ; Malla, Diwa ; Martinoia, Enrico ; Mattson, Neil S. ; Morel, Patrice ; Mueller, Lukas A. ; Muhlemann, Joëlle ; Nouri, Eva ; Passeri, Valentina ; Pezzotti, Mario ; Qi, Qinzhou ; Reinhardt, Didier ; Rich, Melanie ; Richert-Pöggeler, Katja R. ; Robbins, Tim P. ; Schatz, Michael C. ; Schranz, M. Eric ; Schuurink, Robert C. ; Schwarzacher, Trude ; Spelt, Kees ; Tang, Haibao ; Urbanus, SusanL. ; Vandenbussche, Michiel ; Vijverberg, Kitty ; Villarino, Gonzalo H. ; Warner, RyanM. ; Weiss, Julia ; Yue, Zhen ; Zethof, Jan ; Quattrocchio, Francesca ; Sims, Thomas L. ; Kuhlemeier, Cris

In: Nature Plants, 2016, vol. 2, p. 16074

Petunia hybrida is a popular bedding plant that has a long history as a genetic model system. We report the whole-genome sequencing and assembly of inbred derivatives of its two wild parents, P. axillaris N and P. inflata S6. The assemblies include 91.3% and 90.2% coverage of their diploid genomes (1.4 Gb; 2n = 14) containing 32,928 and 36,697 protein-coding genes, respectively. The...

Université de Fribourg

Mathematical modeling of the dynamics of shoot-root interactions and resource partitioning in plant growth

Feller, Chrystel ; Favre, Patrick ; Janka, Ales ; Zeeman, Samuel C. ; Gabriel, Jean-Pierre ; Reinhardt, Didier

In: PLoS ONE, 2015, vol. 10, no. 7, p. e0127905

Plants are highly plastic in their potential to adapt to changing environmental conditions. For example, they can selectively promote the relative growth of the root and the shoot in response to limiting supply of mineral nutrients and light, respectively, a phenomenon that is referred to as balanced growth or functional equilibrium. To gain insight into the regulatory network that controls this...

Université de Fribourg

Flowers and mycorrhizal roots – closer than we think?

Nouri, Eva ; Reinhardt, Didier

In: Trends in Plant Science, 2015, vol. 20, no. 6, p. 344–350

Roots and flowers are formed at the extreme ends of plants and they differ in almost every aspect of their development and function; even so, they exhibit surprising molecular commonalities. For example, the calcium and calmodulin-dependent protein kinase (CCaMK) plays a central role in root symbioses with fungi and bacteria, but is also highly expressed in developing anthers. Moreover,...