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Plant Cell Physiol. 2019 Jan 22. doi: 10.1093/pcp/pcz001. [Epub ahead of print]

Root Adaptation to H2O2-Induced Oxidative Stress by ARF GEF BEN1- and Cytoskeleton-Mediated PIN2 Trafficking.

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Mendel Centre for Plant Genomics and Proteomics, Central European Institute of Technology (CEITEC), Masaryk University, Kamenice 5, Brno, CZ-625 00, Brno, Czech Republic.
Institute of Science and Technology Austria, Klosterneuburg, Austria.
Institute of Experimental Botany AS CR, Rozvojov√° 263, CZ-16502 Prague 6, Czech Republic.


Abiotic stress poses constant challenges for plant survival and is a serious problem for global agricultural productivity. On a molecular level, stress conditions result in elevation of reactive oxygen species (ROS) production causing oxidative stress associated with oxidation of proteins and nucleic acids as well as impairment of membrane functions. Adaptation of root growth to ROS accumulation is facilitated through modification of auxin and cytokinin hormone homeostasis. Here we report that in Arabidopsis root meristem, ROS-induced changes of auxin levels correspond to decreased abundance of PIN auxin efflux carriers at the plasma membrane. Specifically, increase in H2O2 levels affects PIN2 endocytic recycling. We show that the PIN2 intracellular trafficking during adaptation to oxidative stress requires the function of the ADP-ribosylation factor (ARF)-guanine-nucleotide exchange factor (GEF) BEN1, an actin-associated regulator of the trafficking from the plasma membrane to early endosomes and, presumably, indirectly, trafficking to the vacuoles. We propose that H2O2 levels affect the actin dynamics thus modulating ARF GEF-dependent trafficking of PIN2. This mechanism provides a way how root growth acclimates to stress and adapt to a changing environment.


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