Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Asexual reproduction in Phytophthora erythroseptica.

Abstract

At Univ. Manchester P. erythroseptica [cf. 44, 215; 45, 2042] produced abundant sporangia when mycelial mats from pea broth were washed and transferred to shallow water or Petri's sol. The opt. temp, was c. 18-22°C. and opt. pH 7-7.5. Light induced more abundant sporulation but prolonged exposure was unnecessary. The addition of various C sources or thiamine did not induce sporangial development in colonies grown in an entirely synthetic medium.
Fairly high temps, stimulated direct germination, while cooling the cultures before a return to room temp, resulted in indirect germination. Many sporangia, particularly in young colonies, burst and discharged undifferentiated protoplasm. Possible relationships between the method of germination and structure of sporangia are discussed.