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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

Embryonic photosynthesis affects post-germination plant growth

Sela, Ayala ; Piskurewicz, Urszula ; Megies, Christian ; Mène-Saffrané, Laurent ; Finazzi, Giovanni ; Lopez-Molina, Luis

In: Plant Physiology, 2020, vol. 182, no. 4, p. 2166–2181

Photosynthesis is the fundamental process fueling plant vegetative growth and development. The progeny of plants relies on maternal photosynthesis, via food reserves in the seed, to supply the necessary energy for seed germination and early seedling establishment. Intriguingly, before seed maturation, Arabidopsis (Arabidopsis thaliana) embryos are also photosynthetically active, the...

Université de Fribourg

A substrate of the ABC transporter PEN3 stimulates bacterial flagellin (flg22)-induced callose deposition in Arabidopsis thaliana

Matern, Andreas ; Böttcher, Christoph ; Eschen-Lippold, Lennart ; Westermann, Bernhard ; Smolka, Ulrike ; Döll, Stefanie ; Trempel, Fabian ; Aryal, Bibek ; Scheel, Dierk ; Geisler, Markus ; Rosahl, Sabine

In: Journal of Biological Chemistry, 2019, vol. 294, no. 17, p. 6857–6870

Nonhost resistance of Arabidopsis thaliana against Phytophthora infestans, a filamentous eukaryotic microbe and the causal agent of potato late blight, is based on a multilayered defense system. Arabidopsis thaliana controls pathogen entry through the penetration-resistance genes PEN2 and PEN3, encoding an atypical myrosinase and an ABC transporter, respectively, required for synthesis and...

Université de Fribourg

A conserved RxLR effector interacts with host RABA-type GTPases to inhibit vesicle-mediated secretion of antimicrobial proteins

Tomczynska, Iga ; Stumpe, Michael ; Mauch, Felix

In: The Plant Journal, 2018, vol. 95, no. 2, p. 187–203

Plant pathogens of the oomycete genus Phytophthora produce virulence factors, known as RxLR effector proteins that are transferred into host cells to suppress disease resistance. Here, we analyse the function of the highly conserved RxLR24 effector of Phytophthora brassicae. RxLR24 was expressed early in the interaction with Arabidopsis plants and ectopic expression in the host enhanced leaf...