Summary
In Amaranthus seedlings the disappearance of the unstable P fr form of phytochrome does not involve dark reversion to P r . The rate constant for the decay of total phytochrome under continuous illumination is directly related to the proportion in the P fr form. This relationship allows calculations to be made of the proportion of P fr under continuous far-red illumination where the amount is too low to be measured directly.
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Kendrick, R.E., Frankland, B. Kinetics of phytochrome decay in Amaranthus seedlings. Planta 82, 317–320 (1968). https://doi.org/10.1007/BF00386434
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DOI: https://doi.org/10.1007/BF00386434