Factors Affecting Behavior and Developmental Synchrony of Germinating Oospores ofPythium aphanidermatum

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Abstract
Germination of oospores of P. aphanidermatum was greatly stimulated by desiccation of cultures prior to spore isolation. Germination of oospores from desiccated cultures was induced with good synchrony following the application of 2 additional activating treatments: incubation in water for 5 min at 39.degree. C and agitation in 0.1% KMnO4 for 15 min. A synthetic liquid medium containing salts and lecithin was developed for synchronous indirect germination (production of zoospores from oospore hyphal germ tubes). In the absence of lecithin and when lecithin was replaced by other organic compounds in the medium, activated oospores germinated at a very low rate. Addition of glucose and other organic compounds to the liquid germination medium resulted in oospore germination without the production of zoospores (direct germination).

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