Demonstration of different dichroic orientation of phytochrome PR and P FR

Planta. 1969 Jun;88(2):183-6. doi: 10.1007/BF01391124.

Abstract

Experiments are described in which cells of the green algaMougeotia are only partially irradiated by microbeams. Observations on the orientation of the chloroplast following such irradiation give evidence that during photoconversion the axis of dichroism of the phytochrome shifts: PR absorbs parallel and PFR normal to the surface of the cell.