Abstract
Irradiation with red light of coleoptiles and leaves of etiolated oat seedlings, causing photoconversion of phytochrome mainly into P<sub>fr</sub>, leads to the release of free auxins and free gibberellins from conjugated forms. The effect of red light is reversible by far-red light irradiation. A correlation between the photostationary state of phytochrome and endogenous abscisic acid content was not found.
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