Extraocular spectral photosensitivity in the tentacles of Hydra vulgaris

Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
S Guertin, G Kass-Simon

Abstract

Previous electrophysiological studies on the cnidarian Hydra vulgaris have shown that hydra have a highly developed and specific photoresponse despite their lack of any structure recognizable as a traditional photoreceptor. In an effort to identify the site of hydra's photoreceptors, we recorded extracellularly from single excised tentacles and from ablated hypostomes lacking tentacles in absolute darkness and during exposure to light of various wavelengths. During recording, after an initial period of absolute darkness, tentacles or hypostomes were exposed to light from 450nm to 600nm, red, and white light. Exposure to light caused a change in the pattern and frequency of impulses in the tentacles that varied with color. The number of large tentacle pulses (TPs) increased at 550 and 600nm relative to darkness, whereas the number of small tentacle pulses (STPs) tended to decrease in 500nm light. Impulse frequency was significantly different among the different wavelengths. In addition to bursts of tentacle contraction pulses, long trains of pulses were observed. A change in lighting caused a switch from bursting to trains or vice versa. In contrast to excised tentacles, no change in electrical activity was seen in ablated hypos...Continue Reading

References

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Citations

Feb 1, 2017·Science Advances·Claudia TortiglioneGuglielmo Lanzani
Jul 12, 2020·The Journal of Nutrition·Michael H Green
Mar 21, 2019·Zoological Letters·Hiroyuki J KanayaTaichi Q Itoh

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