Publisher's Synopsis
Excerpt from Biological Effects of Radiation, Vol. 2: Mechanism and Measurement of Radiation, Applications in Biology, Photochemical Reactions, Effects of Radiant Energy on Organisms and Organic Products
As a background for their work these investigators previously had been concerned for some time with the peculiar seasonal behavior of certain varieties of tobacco and soy beans. A newly developed form of Maryland tobacco was found to maintain exceptional vegetative vigor through the open growing season without attaining the reproductive stage when propagated in the latitude of Washington, D. C. When grown in the greenhouse during the winter months this form of tobacco made only moderate growth and ?owered and fruited abundantly. With certain varieties of soy beans, plantings at wide intervals through spring and early Summer tended to ?ower at approximately the same date in late summer, the vegetative period being progressively shortened with advance in date of planting. Experiments in varying the temperature and light intensity having failed to materially affect the length of the vegetative stage in the tobacco and soy beans, the simple expedient of shortening by a few hours the midsummer daily exposure to sunlight by use of a dark chamber was tried and very striking results were obtained. The shortened daylight period quickly initiated ?owering in the tobacco plants and greatly hastened formation and ripening of seeds in cultures of the Peking variety of soy beans which had already ?owered when the test was begun.
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