Reactive oxygen species (ROS) is an important toxic and regulatory substance in plants, which is induced by a series of biological and abiotic stresses, hormones, development and gravity signals, and lack of mineral metabolism. At present, many active oxygen sensing systems including MAPK kinase and transcription factors have been discovered. In addition, plasma membrane ion channels may also be involved in plant reactive oxygen sensing and reactive oxygen-mediated regulatory responses. The important role of plasma membrane ion channels of active oxygen in the key physiological functions of animals has been relatively clear, but in plants, the nature and function of such ion channels, especially K + channels activated by hydroxyl radicals (HR), are still unclear. On April 7, 2010, British scientist Demidchik and others selected wild-type (WT) and K + efflux channel gene deletion mutants (gork1-1) as research objects, using non-invasive micro-measurement technology, electronic paramagnetic Resonance (EPR), patch clamp, and cell imaging methods were used to study the K + flow rate, oxygen free radicals, membrane potential, and apoptotic cell morphology of Arabidopsis roots and their protoplasts under different treatment conditions. The study found that both HR and stress can cause significant K + outflow in the roots of Arabidopsis seedlings, but the outflow in mutants is significantly weaker. NaCl can induce roots to produce HR and activate K + channels. The apoptosis of root cells of mutant Arabidopsis thaliana, wild type Arabidopsis thaliana treated with K + channel inhibitor or HR scavenger was slow. It can be concluded that the K + channel activated by HR in plants is also involved in apoptosis. The results of this study present a new perspective on the regulation of ROS transport in plants by ROS, and explain the physiological role of HR activated K + channels in plants. Keywords: Potassium, Programmed cell death, Reactive oxygen species, Stress Reference: Demidchik et al. J. Cell Sci. Doi: 10.1242 / jcs.064352
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