Summary
The in vivo phototransformation kinetics of mustard hook and cotyledon phytochrome exhibit a deviation from a single first order curve, quite similar to that for pumpkin hooks as reported in a previous paper (Boisard, Marmé and Schäfer, 1971). The P fr→Prkinetics can be characterized by the ratios ɛ I fr,λ · P I fr /ɛ II fr,λ · P II fr,λ and \(\tau _{\tfrac{1}{2}}^I /\tau _{\tfrac{1}{2}}^{II} \) where P I fr and P II fr are two populations of phytochrome molecules which convert to P rwith a first order half-life of \(\tau _{\tfrac{1}{2}}^I \) and \(\tau _{\tfrac{1}{2}}^{II} \). These ratios depend on the length of time of etiolation. The ratio ɛ I fr,λ · P I fr /ɛ II fr,λ · P II fr,λ is independent of the amount of total P frpresent at the beginning of the P fr→Prphototransformation after a non-saturating dose of red light. The half-lives of the two populations, however, depend on the concentration of total P frinitially present. P fr→Prphototransformation kinetics with different light intensities show that reciprocity holds.
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References
Boisard, J., Marmé, D., Schäfer, E.: The demonstration in vivo of more than one form of P fr. Planta (Berl.) 99, 302–310 (1971).
Larcher, G.: In preparation (1971).
Marmé, D.: Photometrische Messungen am Phytochromsystem von Senfkeimlingen (Sinapis alba L.). Planta (Berl.) 88, 43–57 (1969).
—: An automatic recording derice for measuring phytochrome with a dual wave-length Ratiospect. Planta (Berl.) 88, 58–60 (1969).
—, Marchal, B., Schäfer, E.: A detailed analysis of phytochrome decay and dark reversion in mustard cotyledons. Planta (Berl.) 100, 331–336 (1971).
Mohr, H.: Untersuchung zur phytochrominduzierten Photomorphogenese des Senfkeimlings (Sinapis alba L.). Z. Pflanzenphysiol. 54, 63–83 (1966).
Schäfer, E., Marchal, B., Marmé, D.: In vivo measurements of the phytochrome photostationary state in far red light. In preparation (1971).
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Schäfer, E., Marchal, B. & Marmé, D. On the phytochrome phototransformation kinetics in mustard seedlings. Planta 101, 265–276 (1971). https://doi.org/10.1007/BF00386833
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DOI: https://doi.org/10.1007/BF00386833