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Science 6 September 1968:
Vol. 161. no. 3845, pp. 1028 - 1029
DOI: 10.1126/science.161.3845.1028
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Articles

Red and Far-Red Light Effects on a Short-Term Behavioral Response of a Dimoflagellate

Richard Forward 1 and Demorest Davenport 1

1 Department of Biological Sciences, University of California, Santa Barbara, 93106

Cessation of movement (stop response) is used as a criterion for light reception by the dinoflagellate Gyrodinium dorsum Kofoid. Brief irradiation (2 seconds at 470 nanometers) elicits a stop response in cells any time during the 6-minute interval after removal from growth lights. This stop response is inactivated by exposure for 4 minutes to 470-nanometer light prior to stimulation. Red light (620 nanometers) reactivates this stop response, and far-red light (700 nanometers) reverses this reactivation. This red-far-red photo reversibility is taken as evidence for phytochrome involvement.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)