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INTERPRETATION OF THE ‘DICHROIC ORIENTATION’ OF PHYTOCHROME
Author(s) -
Sugimoto Tohru,
Ito Etsuro,
Suzuki Hideo
Publication year - 1987
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1987.tb04805.x
Subject(s) - phytochrome , dichroic glass , wavelength , transition dipole moment , chromophore , orientation (vector space) , absorption (acoustics) , biophysics , moment (physics) , chemistry , physics , optics , photochemistry , biology , botany , molecule , red light , geometry , organic chemistry , mathematics , classical mechanics
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 P r , and that the different dichroic orientations of P r and P fr can be attributed to the change in the angle of the long‐wavelength transition moment of phytochrome with the plasma membrane from 18 o to 72 o during phototransformation.