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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...

Complementation of the embryo-lethal T-DNA insertion mutant of AUXIN-BINDING-PROTEIN 1 (ABP1) with abp1 point mutated versions reveals crosstalk of ABP1 and phytochromes

Effendi, Yunus ; Ferro, Noel ; Labusch, Corinna ; Geisler, Markus ; Scherer, Günther F. E.

In: Journal Of Experimental Botany, 2015, vol. 66, no. 1, p. 403-418

SHADE AVOIDANCE 4 is required for proper auxin distribution in the hypocotyl

Ge, Yanhua ; Yan, Fenglian ; Zourelidou, Melina ; Wang, Meiling ; Ljung, Karin ; Fastner, Astrid ; Hammes, Ulrich Z. ; Donato, Martin Di ; Geisler, Markus ; Schwechheimer, Claus ; Tao, Yi

In: Plant Physiology, 2017, vol. 173, no. 1, p. 788–800

The phytohormone auxin is involved in virtually every aspect of plant growth and development. Through polar auxin transport, auxin gradients can be established, which then direct plant differentiation and growth. Shade avoidance responses are well- known processes that require polar auxin transport. In this study, we have identified a mutant, shade avoidance 4 (sav4), defective in...

The auxin transporter, OsAUX1, is involved in primary root and root hair elongation and in Cd stress responses in rice (Oryza sativa L.)

Yu, ChenLiang ; Sun, ChenDong ; Shen, Chenjia ; Wang, Suikang ; Liu, Fang ; Liu, Yan ; Chen, YunLong ; Li, Chuanyou ; Qian, Qian ; Aryal, Bibek ; Geisler, Markus ; Jiang, De An ; Qi, YanHua

In: The Plant Journal, 2015, vol. 83, no. 5, p. 818–830

Auxin and cadmium (Cd) stress play critical roles during root development. There are only a few reports on the mechanisms by which Cd stress influences auxin homeostasis and affects primary root (PR) and lateral root (LR) development, and almost nothing is known about how auxin and Cd interfere with root hair (RH) development. Here, we characterize rice osaux1 mutants that have a longer PR and...

Complementation of the embryo-lethal T-DNA insertion mutant of AUXIN-BINDING-PROTEIN 1 (ABP1) with abp1 point mutated versions reveals crosstalk of ABP1 and phytochromes

Effendi, Yunus ; Ferro, Noel ; Labusch, Corinna ; Geisler, Markus ; Scherer, Günther F. E.

In: Journal of Experimental Botany, 2015, vol. 66, no. 1, p. 403-418

The function of the extracytoplasmic AUXIN-BINDING-PROTEIN1 (ABP1) is largely enigmatic. We complemented a homozygous T-DNA insertion null mutant of ABP1 in Arabidopsis thaliana Wassilewskia with three mutated and one wild-type (wt) ABP1 cDNA, all tagged C-terminally with a strepII–FLAG tag upstream the KDEL signal. Based on in silico modelling, the abp1 mutants were predicted to have altered...

Auxin transport during root gravitropism: transporters and techniques

Geisler, Markus ; Wang, Bangjun ; Zhu, Jinsheng

In: Plant Biology, 2014, vol. 16, no. S1, p. 50-57

Root gravitropism is a complex, plant-specific process allowing roots to grow downward into the soil. Polar auxin transport and redistribution are essential for root gravitropism. Here we summarise our current understanding of underlying molecular mechanisms and involved transporters that establish, maintain and redirect intercellular auxin gradients as the driving force for root gravitropism. We...