title: Disturbances of stem circumnutations evoked by wound-induced variation potentials in Helianthus annuus L.
abstract: The relationship between evoked electrical activity and stem movements in three-week old sunflowers was demonstrated. Electrical potential changes (recorded by Ag/AgCl extracellular electrodes) and time-lapse images (from a top view camera) were recorded and analyzed. A heat stimulus applied to the tip of one of the second pair of leaves evoked a variation potential, transmitted basipetally along one side of the stem. After stimulation, disturbances of circumnutations occurred. They included: changes in the period, disorders in the elliptical shape, and, in some cases, reversion of direction (of movement). We suggest that asymmetrically propagated variation potential induces asymmetric stem shrinking and bending, which strongly disturbs circumnutations. Our results confirm the involvement of electrical potential changes in the mechanism of stem nutations.
authors.affiliation: Department of Biophysics, Institute of Biology, Maria Skłodowska-Curie University, Akademicka 19, PL-20-033 Lublin, Poland. stolarzm@biotop.umcs.lublin.pl
authors.forename: Maria
authors.initials: M
authors.lastname: Stolarz
authors.forename: Halina
authors.initials: H
authors.lastname: Dziubińska
authors.forename: Maciej
authors.initials: M
authors.lastname: Krupa
authors.forename: Agnieszka
authors.initials: A
authors.lastname: Buda
authors.forename: Kazimierz
authors.initials: K
authors.lastname: Trebacz
authors.forename: Tadeusz
authors.initials: T
authors.lastname: Zawadzki
mesh_terms: D005071:Evoked Potentials; D006368:Helianthus / Q000502:physiology*; D006358:Hot Temperature; D009068:Movement; D018515:Plant Leaves / Q000502:physiology; D018547:Plant Stems / Q000502:physiology; D015398:Signal Transduction