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

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

Phyllotaxis involves auxin drainage through leaf primordia

Deb, Yamini ; Marti, Dominik ; Frenz, Martin ; Kuhlemeier, Cris ; Reinhardt, Didier

In: Development, 2015, vol. 142, no. 11, p. 1992–2001

The spatial arrangement of leaves and flowers around the stem, known as phyllotaxis, is controlled by an auxin-dependent reiterative mechanism that leads to regular spacing of the organs and thereby to remarkably precise phyllotactic patterns. The mechanism is based on the active cellular transport of the phytohormone auxin by cellular influx and efflux carriers, such as AUX1 and PIN1. Their...

Université de Fribourg

Genome and transcriptome sequencing identifies breeding targets in the orphan crop tef (Eragrostis tef)

Cannarozzi, Gina ; Plaza-Wüthrich, Sonia ; Esfeld, Korinna ; Larti, Stéphanie ; Wilson, Yi Song ; Girma, Dejene ; Castro, Edouard de ; Chanyalew, Solomon ; Blösch, Regula ; Farinelli, Laurent ; Lyons, Eric ; Schneider, Michel ; Falquet, Laurent ; Kuhlemeier, Cris ; Assefa, Kebebew ; Tadele, Zerihun

In: BMC Genomics, 2014, vol. 15, no. 1, p. 581

Background: Tef (Eragrostis tef), an indigenous cereal critical to food security in the Horn of Africa, is rich in minerals and protein, resistant to many biotic and abiotic stresses and safe for diabetics as well as sufferers of immune reactions to wheat gluten. We present the genome of tef, the first species in the grass subfamily Chloridoideae and the first allotetraploid assembled de...

Université de Fribourg

Elastic domains regulate growth and organogenesis in the plant shoot apical meristem

Kierzkowski, Daniel ; Nakayama, Naomi ; Routier-Kierzkowska, Anne-Lise ; Weber, Alain ; Bayer, Emmanuelle ; Schorderet, Martine ; Reinhardt, Didier ; Kuhlemeier, Cris ; Smith, Richard S.

In: Science, 2012, vol. 335, p. 1096

Although genetic control of morphogenesis is well established, elaboration of complex shapes requires changes in the mechanical properties of cells. In plants, the first visible sign of leaf formation is a bulge on the flank of the shoot apical meristem. Bulging results from local relaxation of cell walls, which causes them to yield to internal hydrostatic pressure. By manipulation of tissue...

Université de Fribourg

High resolution linkage maps of the model organism Petunia reveal substantial synteny decay with the related genome of tomato

Bossolini, Eligio ; Klahre, Ulrich ; Brandenburg, Anna ; Reinhardt, Didier ; Kuhlemeier, Cris

In: Genome, 2011, vol. 54, p. 327-340

Two linkage maps were constructed for the model plant Petunia. Mapping populations were obtained by crossing the wild species Petunia axillaris subsp. axillaris with Petunia inflata, and Petunia axillaris subsp. parodii with Petunia exserta. Both maps cover the seven chromosomes of Petunia, and span 970 centimorgans (cM) and 700 cM of the genomes, respectively. In total, 207 markers were mapped....

Université de Fribourg

Phosphate systemically inhibits development of arbuscular mycorrhiza in Petunia hybrida and represses genes involved in mycorrhizal functioning

Breuillin, Florence ; Schramm, Jonathan ; Hajirezaei, Mohammad ; Ahkami, Amir ; Favre, Patrick ; Druege, Uwe ; Hause, Bettina ; Bucher, Marcel ; Kretzschmar, Tobias ; Bossolini, Eligio ; Kuhlemeier, Cris ; Martinoia, Enrico ; Franken, Philipp ; Scholz, Uwe ; Reinhardt, Didier

In: The Plant Journal, 2010, p. -

Most terrestrial plants form arbuscular mycorrhiza (AM), mutualistic associations with soil fungi of the order Glomeromycota. The obligate biotrophic fungi trade mineral nutrients, mainly phosphate (Pi), for carbohydrates from the plants. Under conditions of high exogenous phosphate supply, when the plant can meet its own P requirements without the fungus, AM are suppressed,...

Université de Fribourg

Microsurgical and laser ablation analysis of leaf positioning and dorsoventral patterning in tomato

Reinhardt, Didier ; Frenz, Martin ; Mandel, Therese ; Kuhlemeier, Cris

In: Development, 2005, vol. 132, p. 15

Leaves are arranged according to regular patterns, a phenomenon referred to as phyllotaxis. Important determinants of phyllotaxis are the divergence angle between successive leaves, and the size of the leaves relative to the shoot axis. Young leaf primordia are thought to provide positional information to the meristem, thereby influencing the positioning of new primordia and hence the divergence...