Euglena: the photoreceptor system for phototaxis
Abstract
The photoreceptor structures (eyespot-paraflagellar body-flagellum) for Euglena phototaxis were investigated by electron microscopy. The paraflagellar body--the photoreceptor--is a highly ordered crystalline lamellar structure. Optical diffraction of the electron micrographs and resulting filtered images of the paraflagellar body suggest that it is formed of rods in a helical arrangement. The action spectra for phototaxis, the in situ spectrum by microspectrophotometry of the paraflagellar body, and flavin analysis of the organism indicate that the photoreceptor molecule is a flavoprotein. The phototaxis action spectrum is similar to the spectrum for O2 evolution and implies that similar molecules participate in the photo processes. As a result, a photochemical scheme is suggested in which a photo-excited flavin and a cytochrome participate in the photoprocess. The photochemistry and photoreceptor structures for Euglena phototaxis are likened to a photoneuro sensory cell.
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Various single-celled eukaryotes (protists) and ciliated larvae of sponges devoid of neurons can display sophisticated behaviours, including phototaxis, gravitaxis or chemotaxis.
“Various single-celled eukaryotes (protists) and the ciliated larvae of sponges devoid of neurons can display sophisticated behaviours, including phototaxis, gravitaxis or chemotaxis.”
From Origin and early evolution of neural circuits for the control of ciliary locomotion (2011) · cites this paper as [27]
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- Authors
- WOLKEN, J. J.
- Affiliations
- Carnegie Mellon University (US)
- Corresponding author
- WOLKEN, JEROME J.
- Venue
- The Journal of Protozoology
- Publisher
- Wiley
- Published
- 1977-11
- Volume
- 24
- Issue
- 4
- Pages
- 518-522
- ISSN
- 0022-3921 (ISSN-L)
- OpenAlex
- W1969980985
- Cited by
- 39
- References
- 36
- Citations by year
- 2022: 2 · 2019: 2 · 2018: 1 · 2017: 1 · 2015: 2 · 2012: 1
- FWCI
- 1.19
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The Journal of Protozoology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Photoreceptor and optogenetics research
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Light effects on plants
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Photosynthetic Processes and Mechanisms
- Keywords
- Euglena, phototaxis, photoreceptors, eyespots, action spectrum, flavoprotein, flavin, cytochromes, photochemistry, flagella
- MeSH terms
- Animals, Euglena gracilis, Flagella, Flavins, Light, Photoreceptor Cells, Spectrophotometry, Atomic
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