Japanese Journal of Phytopathology
Online ISSN : 1882-0484
Print ISSN : 0031-9473
ISSN-L : 0031-9473
Effect of Metalaxyl on Mating Type of Phytophthora infestans and P. parasitica
Tun-tschu CHANGWen-hsiung KO
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1990 Volume 56 Issue 2 Pages 194-198


Two single-oospore isolates (1 A1 and 1 A2) of P. infestans formed oospores in sectors when grown on medium containing metalaxyl. Single-zoospore cultures obtained from the oospore sector of either isolate consisted of both A1 and A2 mating type. All the single-zoospore cultures from the non-treated isolates had the same mating type as the parent isolate. Metalaxyl also caused mating type change in 3 A1 isolates of P. parasitica. The conversion of A1 to A2 mating type by metalaxyl in infected host tissues is postulated as a possible origin of A2 isolates of P. infestans in Europe.

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