Université de Fribourg

WOX5–IAA17 feedback circuit-mediated cellular auxin response is crucial for the patterning of root stem cell niches in Arabidopsis

Tian, Huiyu ; Wabnik, Krzysztof ; Niu, Tiantian ; Li, Hanbing ; Yu, Qianqian ; Pollmann, Stephan ; Vanneste, Steffen ; Govaerts, Willy ; Rolčík, Jakub ; Geisler, Markus ; Friml, Jiří ; Ding, Zhaojun

In: Molecular Plant, 2014, vol. 7, no. 2, p. 277–289

In plants, the patterning of stem cell-enriched meristems requires a graded auxin response maximum that emerges from the concerted action of polar auxin transport, auxin biosynthesis, auxin metabolism, and cellular auxin response machinery. However, mechanisms underlying this auxin response maximum-mediated root stem cell maintenance are not fully understood. Here, we present unexpected evidence...

Université de Fribourg

ER-localized auxin transporter PIN8 regulates auxin homeostasis and male gametophyte development in Arabidopsis

Ding, Zhaojun ; Wang, Bangjun ; Moreno, Ignacio ; Dupláková, Nikoleta ; Simon, Sibu ; Carraro, Nicola ; Reemmer, Jesica ; Pěnčík, Aleš ; Chen, Xu ; Tejos, Ricardo ; Skůpa, Petr ; Pollmann, Stephan ; Mravec, Jozef ; Petrášek, Jan ; Zažímalová, Eva ; Honys, David ; Rolčík, Jakub ; Murphy, Angus ; Orellana, Ariel ; Geisler, Markus ; Friml, Jiří

In: Nature Communications, 2012, p. -

Auxin is a key coordinative signal required for many aspects of plant development and its levels are controlled by auxin metabolism and intercellular auxin transport. Here we find that a member of PIN auxin transporter family, PIN8 is expressed in male gametophyte of Arabidopsis thaliana and has a crucial role in pollen development and functionality. Ectopic expression in sporophytic tissues...

Université de Fribourg

A novel putative auxin carrier family regulates intracellular auxin homeostasis in plants

Barbez, Elke ; Kubeš, Martin ; Rolčík, Jakub ; Béziat, Chloé ; Pěnčík, Aleš ; Wang, Bangjun ; Rosquete, Michel Ruiz ; Zhu, Jinsheng ; Dobrev, Petre I. ; Lee, Yuree ; Zažímalovà, Eva ; Petrášek, Jan ; Geisler, Markus ; Friml, Jiří ; Kleine-Vehn, Jürgen

In: Nature, 2012, p. -

The phytohormone auxin acts as a prominent signal, providing, by its local accumulation or depletion in selected cells, a spatial and temporal reference for changes in the developmental program. The distribution of auxin depends on both auxin metabolism (biosynthesis, conjugation and degradation) and cellular auxin transport. We identified in silico a novel putative auxin transport facilitator...