Electric currents evoked by double-flash excitation of the phototactic alga Chlamydomonas reinhardtii

A. Dér, R. Tóth-Boconádi, L. Keszthelyi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The electric responses that accompany photosensory transduction in Chlamydomonas reinhardtii were measured using a recently developed suspension method. Double-laser-flash excitations were applied to acquire more information on the nature of the photocycle of the retina containing protein in the eye spot, and on the nature of the different components of the photoelectric signals ('photoreceptor potential' and 'regenerative response'). It was found that blue light, as a second illumination following the driving flash with a wavelength of 500 nm, did not affect the membrane-coupled electric events. A characteristic turnover time of nearly 1 s was established for these processes with a second flash of wavelength 500 nm. The results are discussed in terms of their relevance to the photocycle of the retinal protein and to the signal transduction mechanism.

Original languageEnglish
Pages (from-to)76-80
Number of pages5
JournalJournal of Photochemistry and Photobiology, B: Biology
Volume38
Issue number1
DOIs
Publication statusPublished - Mar 1997

Fingerprint

algae
Eye Proteins
Chlamydomonas reinhardtii
electric current
Electric currents
Algae
Lighting
flash
Retina
wavelengths
Signal Transduction
Suspensions
Lasers
Proteins
Light
Wavelength
Signal transduction
Membranes
blue light
photoreceptors

Keywords

  • Chlamydomonas
  • Photoelectric signals
  • Phototaxis
  • Signal transduction

ASJC Scopus subject areas

  • Plant Science
  • Bioengineering
  • Physical and Theoretical Chemistry

Cite this

Electric currents evoked by double-flash excitation of the phototactic alga Chlamydomonas reinhardtii. / Dér, A.; Tóth-Boconádi, R.; Keszthelyi, L.

In: Journal of Photochemistry and Photobiology, B: Biology, Vol. 38, No. 1, 03.1997, p. 76-80.

Research output: Contribution to journalArticle

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