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ROS accumulation under oxidative stress conditions is known to alter auxin levels and decrease PIN auxin efflux carriers at the plasma membrane (PM) in Arabidopsis roots. Here, Zwiewka and Bielach et al. (pp.255-273) show how H2O2 influences PIN2 endocytic recycling by altering actin dynamics controlled by the ADP-ribosylation factor (ARF)-guanine-nucleotide exchange factor (GEF) BEN1, an actin-associated regulator of trafficking from the PM to early endosomes. These findings provide a mechanism for how root growth acclimates to stress and can adapt to changing environments.
The cover image shows ROS localisation (indicated by the ROS fluorescence probe H2DCF-DA, shown in green) in the root tip of a 7-d-old Arabidopsis seedling treated for 2 hours with 2 mM H2O2 by the confocal laser scanning microscopy . Fluorescence signal is observed within the entire root section, with a maximum located in the epidermal cell files. At the cellular level, ROS accumulate in both nuclei and cytosol of epidermal cells. (Image supplied by Agnieszka Bielach, Mendel Centre for Plant Genomics and Proteomics, Central European Institute of Technology (CEITEC), Masaryk University, The Czech Republic.)
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