THE FUNCTION OF PHYTOCHROME IN THE NATURAL ENVIRONMENT—I. CHARACTERIZATION OF DAYLIGHT FOR STUDIES IN PHOTOMORPHOGENESIS AND PHOTOPERIODISM |
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| Authors: | M. G. Holmes Harry Smith |
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| Affiliation: | Department of Physiology and Environmental Studies, University of Nottingham, School of Agriculture, Sutton Bonington, Loughborough, LE12 5RD, Leicestershire, U.K. |
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| Abstract: | Abstract— The daily changes in spectral energy distribution of natural daylight, with special reference to the red and far-red wayelength bands, are outlined. The effects of solar elevation and sky condition are described. The changes in the proportions of red and far-red radiation in daylight which occur at sunrise and sunset are discussed in relation to the possible function of phytochrome in photoperiodic timing. |
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