Serological relationships of some fungi of the genus <i>Pythium</i>

Abstract

Antisera were prepared to nine species of Pythium and serological interrelationships were investigated using the double diffusion technique in agarose and immunoelectrophoresis. Among the nine species the following groups were distinguishable: P. aphanidermatum and P. butleri appear to be identical and different from the other species investigated. Pythium coloratum and P. dissotocum were closely related to each other but very distantly related to the remaining species. Pythium pyrilobum cross-reacted strongly with the homologous antiserum, and only faintly with other antisera. The last group includes very cross-reactive species: P. debaryanum, P. irregulare, P. mamillatum, P. sylvaticum, and P. ultimum.