Effect of Ultraviolet Radiation on Growth and Respiration of Pea Seeds, with Notes on Statistics

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Abstract
Seeds of Pisum sativum were subjected to a radiation of 3650 A. wave length, and the subsequent differences in rates of growth of rayed and control groups determined. The effect of the same radiation on the rate of respiration of etiolated pea seedlings has also been studied. Statistical analyses have been employed in determining the reliability of the results, which point to the following conclusions: Ultraviolet radiation of 3650 A. wave length, in the time and intensity employed and in the absence of all other radiations throughout the experiment, stimulates the subsequent rate of growth of the hypocotyl of pea seeds irradiated in the air-dry state. The rate of respiration of etiolated pea seedlings is temporarily increased by similar treatment with this radiation. These effects are probably incident rather than cumulative.