Abstract
Klein, Richard M. (New York Bot. Gdn., New York, N.Y.), and Deana T. Klein. Interaction of ionizing and visible radiation in mutation induction in Neurospora crassa. Amer. Jour. Bot. 49(8): 870–874. 1962.—Conidia of the purple adenineless strain of N. crassa were irradiated with 25 kr of X rays and then exposed to far‐red or red radiations or to far‐red followed by red radiation. Far‐red light, without effect on un‐irradiated conidia, augmented the genetic damage caused by X rays as measured by survival (colony count), back mutation to adenine prototrophy, and the induction of mutants affecting colony morphology. Post‐X‐irradiation with red light ameliorated the severity of X‐radiation as measured by survival and back mutation. The potentiation of X‐ray‐induced genetic damage by far‐red light could be completely negated by subsequent exposure to red light.
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