Abstract
SUMMARY An explanation is proposed for the differences between completely dark grown and de-etiolated seedlings of some higher plants in their sensitivity to far red inductive light and red-far red photoreversibility. It is based upon the idea that the morphogenic pigment phytochrome is transported during the process of de-etiolation to certain receptor sites of restricted capacity within the plant cell which sites then become activated to initiate the physiological photoresponse.
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