Tohru Sugimoto*, Etsuro Ito, Hideo Suzuki

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


The dichroic orientation of phytochrome observed both in the phytochrome‐mediated phototropism in Adiantum protonemata and in the phytochrome‐mediated chloroplast movement in Mougeotia were analyzed in terms of the orientation of the transition moment associated with the long‐wavelength absorption band, assuming that phytochrome, associated with the plasma membrane, rotates around the normal to the membrane. The orientation of the long‐wavelength transition moment of the phytochrome chromophore was calculated using the zero‐differential overlap approximation of the molecular orbital theory for ir‐electrons. The results indicate that the orientation of the long‐wavelength transition moment mainly changes later than 2 ms after red light excitation of Pr, and that the different dichroic orientations of Pr and Pfr can be attributed to the change in the angle of the long‐wavelength transition moment of phytochrome with the plasma membrane from 18o to 72o during phototransformation.

Original languageEnglish
Pages (from-to)517-523
Number of pages7
JournalPhotochemistry and Photobiology
Issue number4
Publication statusPublished - 1987 Oct

ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry


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