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Structure and Function of the Euglenoid Eyespot: THE PROBABLE LOCATION OF THE PHOTOTAXIS PHOTORECEPTOR

P. A. KIVIC and MARET VESK
Journal of Experimental Botany
Vol. 23, No. 77 (November 1972), pp. 1070-1075
Published by: Oxford University Press
Stable URL: http://www.jstor.org/stable/23688722
Page Count: 6
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Structure and Function of the Euglenoid Eyespot: THE PROBABLE LOCATION OF THE PHOTOTAXIS PHOTORECEPTOR
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Abstract

With Euglena gracilis neither the action spectrum for photokinesis nor that for phototaxis corresponds to the absorption spectrum of the stigma, as has been previously claimed. The phototaxis action spectrum may be interpreted instead as a combination of the photokinesis action spectrum, stigma absorption spectrum, and chloroplast absorption spectrum. This supports the contention that the paraflagellar body rather than the stigma is the probable photoreceptor of the eyespot apparatus, and indicates that both the stigma and chloroplasts provide the directional 'light screen'. It also suggests that the absorption spectrum of this photoreceptor is the photokinesis action spectrum.

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