Document Detail

Action spectrum for the photophobic response of Ciona intestinalis (Ascidieacea, Urochordata) larvae implicates retinal protein.
MedLine Citation:
PMID:  10483365     Owner:  NLM     Status:  MEDLINE    
Ascidian tadpole larvae change swimming behavior during the course of development. The photic behavior of the larvae of Ciona intestinalis was monitored by a computerized cell-tracking system with a time resolution of 0.1 s. Newly hatched larvae swim at an average speed of 1.4 mm/s but show no response to light stimuli. The swimming speed of the larvae became slower (0.4 mm/s) 3 h after hatching and they were induced to swim more rapidly by a sudden decrease in light intensity 4 h after hatching. During the course of development, the maximal speed of swimming behavior increased with time until 8 h after hatching and then plateaued. The action spectrum for the step-down photophobic response of the larvae was determined at around 8 h after hatching and was fitted to Dartnall's nomogram with the absorbance maximum of the pigment located at 505 nm. These results suggest retinal proteins in the ocellus of the larvae are the photoreceptors for the photobehavior.
M Nakagawa; T Miyamoto; M Ohkuma; M Tsuda
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Photochemistry and photobiology     Volume:  70     ISSN:  0031-8655     ISO Abbreviation:  Photochem. Photobiol.     Publication Date:  1999 Sep 
Date Detail:
Created Date:  1999-10-07     Completed Date:  1999-10-07     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0376425     Medline TA:  Photochem Photobiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  359-62     Citation Subset:  IM    
Department of Life Science, Himeji Institute of Technology, Hyogo, Japan.
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MeSH Terms
Behavior, Animal / physiology
Ciona intestinalis / physiology*
Eye Proteins / physiology*
Photic Stimulation
Retinal Pigments / physiology
Reg. No./Substance:
0/Eye Proteins; 0/Retinal Pigments

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