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Wound- and mechanostimulated electrical signals control hormone responses.

  • Farmer EE Department of Plant Molecular Biology, Biophore, University of Lausanne, Lausanne, CH-1015, Switzerland.
  • Gao YQ Department of Plant Molecular Biology, Biophore, University of Lausanne, Lausanne, CH-1015, Switzerland.
  • Lenzoni G Department of Plant Molecular Biology, Biophore, University of Lausanne, Lausanne, CH-1015, Switzerland.
  • Wolfender JL School of Pharmaceutical Sciences, Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, Geneva 4, CH-1211, Switzerland.
  • Wu Q Department of Plant Molecular Biology, Biophore, University of Lausanne, Lausanne, CH-1015, Switzerland.
  • 2020-05-12
Published in:
  • The New phytologist. - 2020
action potential
calcium
ethylene
jasmonate
mechanostimulation
English Plants in nature are constantly exposed to organisms that touch them and wound them. A highly conserved response to these stimuli is a rapid collapse of membrane potential (i.e. a decrease of electrical field strength across membranes). This can be coupled to the production and/or action of jasmonate or ethylene. Here, the various types of electrical signals in plants are discussed in the context of hormone responses. Genetic approaches are revealing genes involved in wound-induced electrical signalling. These include clade 3 GLUTAMATE RECEPTOR-LIKE (GLR) genes, Arabidopsis H+ -ATPases (AHAs), RESPIRATORY BURST OXIDASE HOMOLOGUEs (RBOHs), and genes that determine cell wall properties. We briefly review touch- and wound-induced increases in cytosolic Ca2+ concentrations and their temporal relationship to electrical activities. We then look at the questions that need addressing to link mechanostimulation and wound-induced electrical activity to hormone responses. Utilizing recently published results, we also present a hypothesis for wound-response leaf-to-leaf electrical signalling. This model is based on rapid electro-osmotic coupling between the phloem and xylem. The model suggests that the depolarization of membranes within the vascular matrix triggered by physical stimuli and/or chemical elicitors is linked to changes in phloem turgor and that this plays vital roles in leaf-to-leaf electrical signal propagation.
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  • English
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bronze
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https://folia.unifr.ch/global/documents/215865
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