Radiation Studies of Blastocladiella emersonii

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Abstract
Populations of Bias to-cladlella emersonii zoospores can undergo synchronous germination, nuclear division, and development. Three characteristic responses have been noted for ultraviolet- or gamma-Irradiated zoospores, namely development to a normal, surviving sporangium of about 60 ju in diameter with emission of zoospores and colony formation; a giant sporangium of about 200 y. in diameter, sometimes giving off zoospores after a lag; and a slower growing germling with the usual rhizolds, followed by an abrupt cessation of growth at a diameter of about 30 /1, with no zoospore emission. This "block" indicated In the last occurs at about the same point with either UV or gamma rays over a considerable range of dose. During the earlier growth of this "blocked" germling, nuclear division does not occur normally. The UV damage is photo-reactlvable. Survival of colony-forming ability has been determined for germlings irradiated at various stages of their nuclear division up to the 4-nucleus stage. They are the most sensitive just after nuclear division and most resistant just before. Of several hypotheses to explain this variation, differential repair of damage seems to be the most plausible at present.

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