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Plant Physiology 61:816-818 (1978)
© 1978 American Society of Plant Biologists

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Articles

Phototactic Responses of Cell Population to Repeated Pulses of Yellow Light in a Phytoflagellate Cryptomonas sp. 1

Masakatsu Watanabe and Masaki Furuya

Department of Botany, Faculty of Science, University of Tokyo, Hongo, Tokyo, 113, Japan

Positive phototaxis in cell populations of a phytoflagellate Cryptomonas sp. was recorded photoelectrically when the duration and intensity of repeated pulses of monochromatic yellow light (570 nm) interspersed with darkness were varied. Irrespective of the duration of the light pulses, phototactic responses to repeated pulses were as great as those to continuous irradiation and were linearly dependent on the logarithm of total incident light energy when the dark interval was shorter than 60 milliseconds. Under these conditions, reciprocity between duration and intensity held well. In contrast, when the dark interval exceeded 250 milliseconds, the responses were remarkably reduced regardless of light duration and were not affected by increasing the intensity of actinic light pulses.

The present results clearly indicate that continuous stimulation with actinic light is not essential for the maximum effect, but that the length of dark interval is crucial in phototactic response.

1 This work was supported in part by Research Grant No. 144003 to M. F. from the Ministry of Education of Japan. M. W. is indebted to the Japan Society for the Promotion of Science for a postdoctoral fellowship during the present work.




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K. Yoshimura and R. Kamiya
The Sensitivity of Chlamydomonas Photoreceptor is Optimized for the Frequency of Cell Body Rotation
Plant Cell Physiol., June 1, 2001; 42(6): 665 - 672.
[Abstract] [Full Text] [PDF]


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Copyright © 1978 by the American Society of Plant Biologists