Abstract
IN recent years important progress has been made in our knowledge of the light-dependent processes in plant development. Detailed studies of the action spectrum for the photoperiodic control of flowering and for the germination of certain light-requiring seeds, carried out by Borthwick and his co-workers1, have shown that in both these developmental processes red light is most effective and that under certain conditions infra-red radiation reverses the effect of red illumination. The connexion between photoperiodism and seed germination was further demonstrated by the discovery by Isikawa2 and by Black and Wareing3 of the direct photoperiodic control of germination in seeds of a number of species.
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Borthwick, H. A., Hendricks, S. B., Parker, M. W., Toole, E. H., and Toole, U. K., Proc. U.S. Nat. Acad. Sci., 38, 662 (1952).
Isikawa, S., Bot. Mag. Tokyo, 67, 51 (1954).
Black, M., and Wareing, P. F., Physiol. Plant, 8, 300 (1955).
Stolwijk, J. A. J., “Wavelength Dependence of Photo-Morphogenesis in Plants” (Wageningen, 1954).
Meischke, D., Jahrb. Wiss. Bot., 83, 359 (1936).
Baxter-Jones, M., and Bailey, L. F., Plant Phys., 5, 347 (1956).
Stolwijk, J. A. J., and Zeewaart, J. A. D., Kon. Ned. Akad. Wetensch., C, 58, 386 (1955).
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BLACK, M., WAREING, P. Sensitivity of Light-inhibited Seeds to Certain Spectral Regions. Nature 180, 395 (1957). https://doi.org/10.1038/180395a0
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DOI: https://doi.org/10.1038/180395a0
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