Abstract
Populations of Blastocladiella 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 (1) a normal, surviving sporangium of about 60 microns in diameter with emission of zoospores and colony formation; (2) a giant sporangium of about 200 microns in diameter, sometimes giving off zoospores after a lag; and (3) a slower growing germling with the usual rhizoids, followed by an abrupt cessation of growth at a diameter of about 30 microns, with no zoospore emission. This block indicated in (3) 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 photoreactivable. Survival of colony-forming ability has been determined for germlings irradiated at various stages of their nuclear division up to the four nucl...
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