Electrical responses of Lymnaea stagnalis to light stimulation: Effect of divalent cations

V. V. Zhukov, A. D. Fedorenko, A. I. Lavrova, E. B. Postnikov

Research output: Contribution to journalArticlepeer-review

Abstract

The effects of Ca2+, Mg2+ and Mn2+ on light-evoked electrical responses, ERG and action potentials of optic nerve fibers, were studied in an isolated eye of Lymnaea stagnalis. Signals of both types persisted with minor changes when Mg2+ concentration in the bath solution was increased up to 15 mM. This finding suggests that action potentials of photoreceptor cells are transmitted via their axons directly to central ganglia without a relay in chemical synapses on interneurons. At the same time, the changed spiking pattern may indicate chemical interactions between photoreceptors cells themselves. In the presence of 4 mM EDTA or 10 mM Mn2+, both ERG waves and spiking activity were considerably depressed, probably, as a result of impaired phototransduction in photoreceptor cells.

Original languageEnglish
Pages (from-to)404-413
Number of pages10
JournalJournal of Evolutionary Biochemistry and Physiology
Volume53
Issue number5
DOIs
StatePublished - 1 Sep 2017
Externally publishedYes

Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Biochemistry
  • Physiology

Keywords

  • divalent cations
  • electroretinogram (ERG)
  • eye
  • Lymnaea stagnalis
  • optic nerve
  • spiking activity

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