PHOTOMOVEMENT RESPONSES OF PORPHYRIDIUM PURPUREUM

Sylvia A. Hill, Leslie R. Towill, Milton R. Sommerfeld

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

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 · m2· 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.

Original languageEnglish (US)
Pages (from-to)444-448
Number of pages5
JournalJournal of Phycology
Volume16
Issue number3
DOIs
StatePublished - Sep 1980

Keywords

  • Porphyridium
  • Rhodophyta
  • action spectrum
  • gliding movement
  • phototaxis

ASJC Scopus subject areas

  • Aquatic Science
  • Plant Science

Fingerprint Dive into the research topics of 'PHOTOMOVEMENT RESPONSES OF PORPHYRIDIUM PURPUREUM'. Together they form a unique fingerprint.

Cite this