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PHOTOMOVEMENT RESPONSES OF PORPHYRIDIUM PURPUREUM 1
Author(s) -
Hill Sylvia A.,
Towill Leslie R.,
Sommerfeld Milton R.
Publication year - 1980
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.1980.tb03059.x
Subject(s) - biology , wavelength , algae , botany , interference (communication) , biophysics , motility , optics , microbiology and biotechnology , physics , channel (broadcasting) , electrical engineering , engineering
The influence of light quality on positive phototopotaxis by the gliding, unicellular red alga Porphyridium purpureum was obtained using interference filters. Cells exposed to 3 × 10 −7 mol · m 2 · s −1 of various wavelengths for 72 h showed maximum topotaxis at 420 and 440 nm. The lower threshold for positive, movement was approximately 5 × 10 −8 mol · m −2 · s −1 . Random movement occurred at nonactinic wavelengths, and no movement occurred in the dark. Cell motility appeared to be unaffected by light polarity, suggesting that the photoreceptor(s) for topotaxis and photokinesis are randomly oriented.