Abstract
Five different wavelengths (730, 760, 780, 810, and 820 mμ ) and two levels of irradiance ( 1500 and 200 μ wcm2) were employed to determine the action spectrum of the potentiating effect of far-red radiant energy on x-ray- induced chromatid aberrations in Vicia root tips. It was found that radiant energy in the region from 760 to 780 m μ was most effective in increasing the aberrations. Probably an irradiance of 200 μ w/cm2 is the threshold for the induction of the potentiation in Vicia.
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