Université de Fribourg

Plant development regulated by cytokinin sinks

Zürcher, Evelyne ; Liu, Jingchun ; Donato, Martin di ; Geisler, Markus ; Müller, Bruno

In: Science, 2016, vol. 353, no. 6303, p. 1027–1030

Morphogenetic signals control the patterning of multicellular organisms. Cytokinins are mobile signals that are perceived by subsets of plant cells. We found that the responses to cytokinin signaling during Arabidopsis development are constrained by the transporter PURINE PERMEASE 14 (PUP14). In our experiments, the expression of PUP14 was inversely correlated to the cytokinin signaling...

Université de Fribourg

TWISTED DWARF1 mediates the action of auxin transport inhibitors on actin cytoskeleton dynamics

Zhu, Jinsheng ; Bailly, Aurelien ; Zwiewka, Marta ; Sovero, Valpuri ; Donato, Martin Di ; Ge, Pei ; Oehri, Jacqueline ; Aryal, Bibek ; Hao, Pengchao ; Linnert, Miriam ; Burgardt, Noelia Inés ; Lücke, Christian ; Weiwad, Matthias ; Michel, Max ; Weiergräber, Oliver H. ; Pollmann, Stephan ; Azzarello, Elisa ; Mancuso, Stefano ; Ferro, Noel ; Fukao, Yoichiro ; Hoffmann, Céline ; Wedlich-Söldner, Roland ; Friml, Jiří ; Thomas, Clément ; Geisler, Markus

In: The Plant Cell, 2016, vol. 28, no. 4, p. 930–948

Plant growth and architecture is regulated by the polar distribution of the hormone auxin. Polarity and flexibility of this process is provided by constant cycling of auxin transporter vesicles along actin filaments, coordinated by a positive auxin-actin feedback loop. Both polar auxin transport and vesicle cycling are inhibited by synthetic auxin transport inhibitors, such as...

Université de Fribourg

7-rhamnosylated flavonols modulate homeostasis of the plant hormone auxin and affect plant development

Kuhn, Benjamin M. ; Errafi, Sanae ; Bucher, Rahel ; Dobrev, Petre ; Geisler, Markus ; Bigler, Laurent ; Zažímalová, Eva ; Ringli, Christoph

In: Journal of Biological Chemistry, 2016, vol. 291, no. 10, p. 5385–5395

Flavonols are a group of secondary metabolites that affect diverse cellular processes. They are considered putative negative regulators of the transport of the phytohormone auxin, by which they influence auxin distribution and concomitantly take part in the control of plant organ development. Flavonols are accumulating in a large number of glycosidic forms. Whether these have distinct...

Université de Fribourg

The auxin response factor, OsARF19, controls rice leaf angles through positively regulating OsGH3-5 and OsBRI1

Zhang, Saina ; Wang, Suikang ; Xu, Yanxia ; Yu, Chenliang ; Shen, Chenjia ; Qian, Qian ; Geisler, Markus ; Jiang, De An ; Qi, Yanhua

In: Plant, Cell & Environment, 2014, p. –

Auxin and brassinosteroid (BR) are important phytohormones for controlling lamina inclination implicated in plant architecture and grain yield. But the molecular mechanism of auxin and BR crosstalk for regulating lamina inclination remains unknown. Auxin response factors (ARFs) control various aspects of plant growth and development. We here report that OsARF19-overexpression rice lines show an...