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Light-adaptation in the photophobic response by Stentor coeruleus |
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| Authors: | C B Hong R K Prusti P -S Song |
| Affiliation: | (1) Department of Chemistry, University of Nebraska, 68588 Lincoln, NE, USA;(2) Present address: Department of Biology, B-022, University of California at San Diego, 92093 La Jolla, CA, USA;(3) Present address: Department of Chemistry and Biochemistry, Texas Tech University, 79409 Lubbock, TX, USA |
| Abstract: | Effects of preillumination on photophobic response (light-adaptation) and recovery of the photophobic sensitivity in the dark (dark-adaptation) in Stentor coeruleus were examined. When the cells were preilluminated with white light of 7.80 W/m2 for 2 min, the fluence-rate response curve of photophobic response was shifted toward higher light intensities by half an order of magnitude compared to the one without preillumination. Preillumination with a higher light intensity resulted in a further shift of the fluencerate response curve. An action spectrum for light-adaptation showed a primary peak at 610 nm and secondary peaks at 540 and 480 nm which are almost identical to the peaks observed in the photophobic action spectrum.The light-adapted cells showed a recovery of their photophobic sensing ability following dark treatment. Dark-adaptation resulted in total recovery of photophobic sensing ability in 8 minutes for the most cases examined. |
| Keywords: | Adaptation Ciliate Stentor coeruleus Photophobic response Action spectrum |
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