Abstract
As the receiver of photoperiodic responses of plants is the phytochrome, it may be concluded that these responses are controlled also by the spectral composition of natural radiation, especially by the red and far red bands. The red radiation is affected by ozone “Chappuis-band absorption”, the far red by water vapor in the atmosphere “alpha-band absorption”. Using a rapid-scanning spectroradiometer, the measurements of the natural radiation were performed. The evident annual cycle of far red to red radiation ratio was found. The ratio has its maximum in the spring and minimum in the late summer and autumn. It seems to be probable that this cycle assists plants in making a distinction between spring and autumn.
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Górski, T. Annual cycle of the red and far red radiation. Int J Biometeorol 24, 361–365 (1980). https://doi.org/10.1007/BF02250579
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DOI: https://doi.org/10.1007/BF02250579