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Université de Fribourg

HSP90 and co-chaperones: a multitaskers’ view on plant hormone biology

Donato, Martin di ; Geisler, Markus

In: FEBS Letters, 2019, vol. 593, no. 13, p. 1415–1430

In order to survive under ever‐changing conditions plants must be able to adaptively respond to their environment. Plant hormones and the signaling cross‐talk among them play a key role in integrating external and internal cues, enabling the plants to acclimate accordingly. HSP90 and several of its co‐chaperones are known as pleiotropic factors involved in the signaling pathways 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...

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

The auxin influx carrier, OsAUX3, regulates rice root development and responses to aluminium stress

Wang, Mei ; Qiao, JiYue ; Yu, ChenLiang ; Chen, Hao ; Sun, ChenDong ; Huang, LinZhou ; Li, ChuanYou ; Geisler, Markus ; Qian, Qian ; Jiang, De An ; Qi, YanHua

In: Plant, Cell & Environment, 2019, vol. 42, no. 4, p. 1125–1138

In rice, there are five members of the auxin carrier AUXIN1/LIKE AUX1 family; however, the biological functions of the other four members besides OsAUX1 remain unknown. Here, by using CRISPR/Cas9, we constructed two independent OsAUX3 knock‐down lines, osaux3‐1 and osaux3‐2, in wild‐type rice, Hwayoung (WT/HY) and Dongjin (WT/DJ). osaux3‐1 and osaux3‐2 have shorter primary roots...

Université de Fribourg

Seeing is better than believing: visualization of membrane transport in plants

Geisler, Markus

In: Current Opinion in Plant Biology, 2018, vol. 46, p. 104–112

Recently, the plant transport field has shifted their research focus toward a more integrative investigation of transport networks thought to provide the basis for long- range transport routes. Substantial progress was provided by of a series of elegant techniques that allow for a visualization or prediction of substrate movements in plant tissues in contrast to established quantitative...

Université de Fribourg

A transportome-scale amiRNA-based screen identifies redundant roles of Arabidopsis ABCB6 and ABCB20 in auxin transport

Zhang, Yuqin ; Nasser, Victoria ; Pisanty, Odelia ; Omary, Moutasem ; Wulff, Nikolai ; Donato, Martin Di ; Tal, Iris ; Hauser, Felix ; Hao, Pengchao ; Roth, Ohad ; Fromm, Hillel ; Schroeder, Julian I. ; Geisler, Markus ; Nour-Eldin, Hussam Hassan ; Shani, Eilon

In: Nature Communications, 2018, vol. 9, no. 1, p. 4204

Transport of signaling molecules is of major importance for regulating plant growth, development, and responses to the environment. A prime example is the spatial- distribution of auxin, which is regulated via transporters to govern developmental patterning. A critical limitation in our ability to identify transporters by forward genetic screens is their potential functional redundancy. Here,...

Université de Fribourg

Plant hormone transporters: what we know and what we would like to know

Park, Jiyoung ; Lee, Youngsook ; Martinoia, Enrico ; Geisler, Markus

In: BMC Biology, 2017, vol. 15, p. 93

Hormone transporters are crucial for plant hormone action, which is underlined by severe developmental and physiological impacts caused by their loss-of-function mutations. Here, we summarize recent knowledge on the individual roles of plant hormone transporters in local and long-distance transport. Our inventory reveals that many hormones are transported by members of distinct transporter...

Université de Fribourg

Arabidopsis BTB/POZ protein-dependent PENETRATION3 trafficking and disease susceptibility

Mao, Hailiang ; Aryal, Bibek ; Langenecker, Tobias ; Hagmann, Jörg ; Geisler, Markus ; Grebe, Markus

In: Nature Plants, 2017, vol. 3, no. 11, p. 854

The outermost cell layer of plant roots (epidermis) constantly encounters environmental challenges. The epidermal outer plasma membrane domain harbours the PENETRATION3 (PEN3)/ABCG36/PDR8 ATP-binding cassette transporter that confers non-host resistance to several pathogens. Here, we show that the Arabidopsis ENDOPLASMIC RETICULUM-ARRESTED PEN3 (EAP3) BTB/POZ-domain protein specifically...

Université de Fribourg

A critical view on abc transporters and their interacting partners in auxin transport

Geisler, Markus ; Aryal, Bibek ; Di Donato, Martin ; Hao, Pengchao

In: Plant and Cell Physiology, 2017, vol. 58, no. 10, p. 1601–1614

Different subclasses of ATP-binding cassette (ABC) transporters have been implicated in the transport of native variants of the phytohormone auxin. Here, the putative, individual roles of key members belonging to the ABCB, ABCD and ABCG families, respectively, are highlighted and the knowledge of their assumed expression and transport routes is reviewed and compared with their mutant phenotypes....