The organisation of photosynthetic pigments in a cryptophyte alga: A linear dichroism study

Roger G. Hiller*, Carol D. Scaramuzzi, Jacques Breton

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


Linear dichroism spectra have been obtained for cells, thylakoid membranes, light-harvesting complex and the Photosystem I of Chroomonas. In the light-harvesting complex, a form of chlorophyll c (chl c) shows strong dichroism at 648 nm, the Oy chlorophyll a (chl a) transition is split at low temperature but only that absorbing at 674 nm is strongly dichroic. We conclude that the 660 nm component of the Qy transition of chl a is oriented close to 55° to the membrane normal (or the direction of the applied force) whereas that at 674 nm is at 55°, i.e., ciose to the plane of the membrane and the plane of largest cross-section of the particle. The orientation of these transitions is in agreement with that observed in the intact cells. Phycoerythrin within the thylakoid lumen is not preferentially oriented. The orientation of chl a in Photosystem I resembles that previously reported for other photosynthesis organisms, i.e., the long-wavelength Qy transitions are oriented parallel to the membrane plane.

Original languageEnglish
Pages (from-to)360-364
Number of pages5
JournalBBA - Bioenergetics
Issue number3
Publication statusPublished - 16 Oct 1992
Externally publishedYes


  • (Chrooomonas CS 24)
  • Chlorophyll c
  • Light-harvesting complex
  • Linear dichroism
  • Photosystem I
  • Pigment orientation


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