title: The mechanism of propagation of variation potentials in wheat leaves.
abstract: Here we examined the mechanism of propagation of variation potential (VP) induced by burning in wheat leaves. Participation of hydraulic and chemical mechanisms in VP transmission was analyzed by optical coherent tomography and a radioactive tracer method, respectively. The speed of the hydraulic signal considerably exceeded the VP velocity. Investigation of a chemical substance spreading from the zone of local wounding was based on experimental data for radioactive marker transmission derived with a one-dimensional diffusion equation. The speed of the marker transmission was in accordance with VP velocity. The elimination of the potential transmission of a chemical signal by a timed severing of the leaf between the burn site and the recorded site blocked VP propagation. We suggest that a VP is formed by the transmission of a wound substance, the velocity of which is likely increased by hydraulic wave propagation.
authors.affiliation: Department of Biophysics, University of Nizhni Novgorod, 23 Prospekt Gagarina, 603950 Nizhni Novgorod, Russia. v.vodeneev@mail.ru
authors.forename: Vladimir
authors.initials: V
authors.lastname: Vodeneev
authors.forename: Anna
authors.initials: A
authors.lastname: Orlova
authors.forename: Ekaterina
authors.initials: E
authors.lastname: Morozova
authors.forename: Lyubov
authors.initials: L
authors.lastname: Orlova
authors.forename: Elena
authors.initials: E
authors.lastname: Akinchits
authors.forename: Olga
authors.initials: O
authors.lastname: Orlova
authors.forename: Vladimir
authors.initials: V
authors.lastname: Sukhov
mesh_terms: D000200:Action Potentials / Q000502:physiology; D002250:Carbon Radioisotopes; D004058:Diffusion; D055724:Electrophysiological Phenomena; D005390:Fires; D008954:Models, Biological; D018515:Plant Leaves / Q000166:cytology / Q000502:physiology*; D011849:Radioactive Tracers; D015398:Signal Transduction / Q000502:physiology; D013997:Time Factors; D041623:Tomography, Optical Coherence; D014908:Triticum / Q000502:physiology*
chemical_list: D002250:Carbon Radioisotopes; D011849:Radioactive Tracers