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The influence of de‐etiolation on the sensitivity of Avena coleoptiles to the far‐red absorbing form of phytochrome
Author(s) -
BlaauwJansen G.,
Post Th. H.
Publication year - 1985
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1985.tb08685.x
Subject(s) - coleoptile , phytochrome , avena , etiolation , red light , far red , botany , biophysics , biology , chemistry , biochemistry , enzyme
In photoresponses regulated by phytochrome the effect of a red irradiation is not always reversed by far‐red. This applies for instance to the influence of red light on the geotropic reactions of Avena coleoptiles. We could induce red/far‐red reversibility by a short de‐etiolating exposure to red light about 20 h prior to the experimental irradiations. This, was due to a decrease of the sensitivity to the low level of the far‐red absorbing form of phytochrome that is established by far‐red. Since etiolated plants react also to a wavelength of 520 nm (green light), it is advisable to expose the coleoptiles to a de‐etiolating irradiation prior to manipulations in green safelight in order to prevent the plants from reacting to the green light.