Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Reversible change of mating type in Phytophthora parasitica.

Abstract

In addition to the original mating type, the opposite type appeared in the zoospore population of single isolates of P. [nicotianae var.] parasitica after long-term storage or chloroneb treatment. Occasionally self-fertile zoospores were also detected, but their self-induction nature was transitory and unstable. Both hormone production and hormone reception were changed in the sexual variants. The results explain the apparent change from cross-induction (heterothallic) to self-induction (homothallic) in the fungus after long-term storage and chloroneb treatment, and suggest one possible evolutionary origin of sex in the lower fungi.