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Thoughts on the possible role of phytochrome destruction in phytochrome controlled responses
Author(s) -
BLAAUWJANSEN G.
Publication year - 1983
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/1365-3040.ep11587614
Subject(s) - phytochrome , biophysics , adaptation (eye) , fluence , chemistry , biology , physics , botany , red light , optics , neuroscience , laser
. Fluence‐response curves for low‐energy phytochrome responses show two steps at red light exposures c . two orders of magnitude apart. This Feature of the fluence‐response relationship can be interpreted as the consequence of the following processes:1 Induction of a photoresponse by a very low level of Pfr. 2 Activation of a Pfr‐destroying enzyme above a threshold level of [Pfr]. 3 Dependency of the rate of Pfr destruction on [Pfr] once the threshold level is reached.In this way, adaptation of the phytochrome control system to a broad range of light doses could be realized.