Abstract
Hydra is photosensitive, although missing known organized photorece- ptive cellular structures. Its contraction-relaxation activity is periodic. Short or long wavelength visible light has opposite effects (respectively long/short main contraction-relaxation period during steady stimulation, low/ high efficiency in interrupting a contraction in progress, long/short reaction time until the next contraction after a pulse stimulation given just after a contraction, decrease/increase of the above reaction time as long as the time of the pulse application after a contraction increases) and they interact on each other (as tested with two stimuli of different wavelengths in close succession). A photocycle mechanism could be hypothesized.
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Taddei-Ferretti, C., Di Maio, V., Ferraro, S., Cotugno, A. (1988). Hydra Photoresponses to Different Wavelengths. In: Douglas, R.H., Moan, J., Dall’Acqua, F. (eds) Light in Biology and Medicine. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0709-9_54
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DOI: https://doi.org/10.1007/978-1-4613-0709-9_54
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