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Continuous irradiation of Mougeotia with linearly polarized green light (550 nanometers, 0.2 watt per square meter) induces a change in the orientation of its chloroplast from profile to face position, if the electrical vector of the green light is vibrating normal to the cell axis. This change is complete within 25 minutes of the onset of irradiation. In contrast, if the electrical vector of the green light is parallel to the cell axis, no chloroplast reorientation is induced, even with a fluence rate as high as 3 watts per square meter. Furthermore, unpolarized far-red light (727 nanometers, 2 watts per square meter) given alone has no effect on chloroplast reorientation. Simultaneous and continuous irradiation with polarized green light, regardless of its plane of polarization, together with unpolarized far-red light, however, does lead to chloroplast reorientation. These data indicate that, in addition to the red-absorbing form of phytochrome, there exists in Mougeotia another sensory pigment absorbing green light.

Interaction between Green and Far-Red Light on the Low Fluence Rate Chloroplast Orientation in Mougeotia