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Phytochrome in Pharbitis nil during and after de‐etiolation
Author(s) -
Rombach J.,
Bensink J.,
Katsura N.
Publication year - 1982
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.1399-3054.1982.tb00335.x
Subject(s) - etiolation , phytochrome , darkness , pharbitis nil , red light , white light , botany , biology , far red , absorbance , blue light , biophysics , chemistry , biochemistry , chromatography , optics , physics , enzyme
Phytochrome (P) was measured by in vivo spectrophotometry in the cotyledons of Pharbitis nil Choisy cv. Violet. In etiolated plants exposure to red light (R) results in a rapid fall in P content by destruction of the far‐red absorbing form of phytochrome (Pfr). In continuous R or white light the P content falls as a result of destruction to a stable 3% of that originally present. In Norflurazon‐treated white light de‐etiolated plants, Pfr undergoes reversion in darkness to the red absorbing form of phytochrome (Pr) with a half life of 4 h at 19°C, while total P remains constant. Synthesis of Pr after de‐etiolation occurs at a slow rate and is enhanced by terminating the de‐etiolation light treatment with far‐red light. The results are discussed in relation to the P control of flowering.