The movement of the rectangular shaped chloroplast ofMesotaeniumbelongs to the same type as that ofMougeotia. Especially the following facts are in agreement withMougeotia: 1. The low-energy movement (so-called positive phototaxis) is induced by the well known red far-red reaction system. 2. Polarized light induces this movement only when vibrating perpendicularly to the cell axis. 3. Polarized red light vibrating parallel to the cell axis is not only ineffective in inducing the movement but antagonizes the induction achieved by cross vibrating light. Therefore, unpolarized light is less effective than polarized light on a basis of equal energy (this latter effect has not been stated inMougeotiauntil now).
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