Summary
The phytochrome concentration in dark-grown seedlings of Pisum sativum, Phaseolus aureus and Sinapis alba remained constant under continuous far-red illumination for periods of up to 6 hours. Similar treatment of Zea mays seedlings reduced the phytochrome concentration by more than 60 percent. The results in the dicotyledonous seedlings may be due to the reversion of Pfr to Pr at a rate sufficient to prevent Pfr destruction; no evidence for reversion has been detected in Zea. Typical photomorphogenic responses were observed in the dicotyledonous seedlings in the absence of Pfr destruction.
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References
Briggs, W. R., and H. P. Chon: Physiological versus spectrophotometric status of phytochrome in corn coleoptiles. Plant Physiol. 41, 1715–1724 (1966).
Butler, W. L., and H. C. Lane: Non-photochemical transformations of phytochrome in vivo. II. Plant Physiol. 40, 13–17 (1965).
——, and H. W. Siegelman: Non-photochemical transformations of phytochrome in vivo. Plant Physiol. 38, 514–519 (1963).
Chorney, W., and S. A. Gordon: Action spectrum and characteristics of light activated disappearance of phytochrome in oat seedlings. Plant Physiol. 41, 891–896 (1960).
Clarkson, D. T., and W. S. Hillman: Modification of apparent phytochrome synthesis in Pisum by inhibitors and growth regulators. Plant Physiol. (in press).
Furuya, M., and W. S. Hillman: Observations on spectrophotometrically assayable phytochrome in vivo in etiolated Pisum seedlings. Planta (Berl.) 63, 31–42 (1964).
——: Rapid destruction of the Pfr form of phytochrome by a substance in extracts of Pisum tissue. Plant Physiol. 41, 1242–1244 (1966).
—, W. G. Hopkins, and W. S. Hillman: Effects of metal-complexing and sulphydryl compounds on nonphotochemical phytochrome changes in vivo. Arch. Biochem. 112, 180–186 (1965).
Hartmann, K. M.: A general hypothesis to interpret high energy phenomena of photomorphogenesis on the basis of phytochrome. Photochem. Photobiol. 5, 349–366 (1966).
Hillman, W. S.: Phytochrome conversion by brief illumination and subsequent elongation of etiolated Pisum stem segments. Physiol. Plantarum 18, 346–358 (1965).
Hillman, W. S.: Physiology of phytochrome. Ann. Rev. Plant Physiol. (in press).
Hopkins, W. G., and W. S. Hillman: Phytochrome changes in tissues of dark grown seedlings representing various photoperiodic classes. Amer. J. Bot. 52, 427–432 (1965).
Klein, W. H., J. L. Edwards, and W. Shropshire Jr.: Spectrophotometric measurements of phytochrome in vivo and their correlation with photomorphogenetic responses of Phaseolus. Plant Physiol. 42, 264–270 (1967).
Mohr, H., E. Wagner u. K. M. Hartmann: Zur Deutung der Hochenergiereaktion der Photomorphogenese (=HER) auf der Basis des Phytochromsystems. Naturwissenschaften 52, 209 (1965).
Wagner, E., and H. Mohr: Kinetic studies to interpret high energy phenomena of photomorphogenesis on the basis of phytochrome. Photochem. Photobiol. 5, 397–406 (1966).
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Research carried out at Brookhaven National Laboratory under the auspices of the U.S. Atomic Energy Commission.
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Clarkson, D.T., Hillman, W.S. Stability of phytochrome concentration in dicotyledonous tissues under continuous far-red light. Planta 75, 286–290 (1967). https://doi.org/10.1007/BF00386329
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DOI: https://doi.org/10.1007/BF00386329