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Université de Fribourg

The karrikin signaling regulator SMAX1 controls Lotus japonicus root and root hair development by suppressing ethylene biosynthesis

Carbonnel, Samy ; Dasa, Debatosh ; Varshney, Kartikye ; Kolodziej, Markus C. ; Villaécija-Aguilar, José A. ; Gutjahr, Caroline

In: Proceedings of the National Academy of Sciences, 2020, vol. 117, no. 35, p. 21757–21765

An evolutionarily ancient plant hormone receptor complex comprising the α/β-fold hydrolase receptor KARRIKIN INSENSITIVE 2 (KAI2) and the F-box protein MORE AXILLARY GROWTH 2 (MAX2) mediates a range of developmental responses to smoke-derived butenolides called karrikins (KARs) and to yet elusive endogenous KAI2 ligands (KLs). Degradation of SUPPRESSOR OF MAX2 1 (SMAX1) after ligand ...

Université de Fribourg

A novel Ca2+-binding protein that can rapidly transduce auxin responses during root growth

Hazak, Ora ; Mamon, Elad ; Lavy, Meirav ; Sternberg, Hasana ; Behera, Smrutisanjita ; Schmitz-Thom, Ina ; Bloch, Daria ; Dementiev, Olga ; Gutman, Itay ; Danziger, Tomer ; Schwarz, Netanel ; Abuzeineh, Anas ; Mockaitis, Keithanne ; Estelle, Mark ; Hirsch, Joel A. ; Kudla, Jörg ; Yalovsky, Shaul

In: PLOS Biology, 2019, vol. 17, no. 7, p. e3000085

Signaling cross talks between auxin, a regulator of plant development, and Ca2+, a universal second messenger, have been proposed to modulate developmental plasticity in plants. However, the underlying molecular mechanisms are largely unknown. Here, we report that in Arabidopsis roots, auxin elicits specific Ca2+ signaling patterns that spatially coincide with the expression pattern of...

Université de Fribourg

ABCG36/PEN3/PDR8 Is an Exporter of the Auxin Precursor, Indole-3-Butyric Acid, and Involved in Auxin-Controlled Development

Aryal, Bibek ; Huynh, John ; Schneuwly, Jerôme ; Siffert, Alexandra ; Liu, Jie ; Alejandro, Santiago ; Ludwig-Müller, Jutta ; Martinoia, Enrico ; Geisler, Markus

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

The PDR-type ABCG transporter, ABCG36/PDR8/PEN3, is thought to be implicated in the export of a few structurally unrelated substrates, including the auxin precursor, indole-3-butyric acid (IBA), although a clear-cut proof of transport is lacking. An outward facing, lateral root (LR) location for ABCG36 fuelled speculations that it might secrete IBA into the rhizosphere. Here, we provide...