2005•Unpublished venueRequires access

STUDIES ON RESISTANCE OF PHYTOPHTHORA SOJAE TO METALAXYL

Zuo Yu

Abstract

Phytophthora sojae developed the resistance to metalaxyl easily. The metalaxyl-resistant isolate (Mtr) of P. sojae was found in the wild-type isolates of P. sojae after treatment with metalaxyl. The resistance level of the metalaxyl-resistant isolate was over 870 times higher than that of the single zoospore progeny isolates of the wild-type parent isolate. The resistance to metalaxyl of Mtr isolate was inherited stably, and they did not show variation from the first zoospore progeny to the third zoospore progeny. The maintenance character of Mtr was not depended on metalaxyl. The resistance to metalaxyl of Mtr single zoospore isolate was not reduced and their zoospore progeny were not varied after 22-30 days growth on the metalaxyl free carrot agar medium (CA).

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Key concepts: Metalaxyl, Zoospore, Phytophthora sojae, Biology, Phycomycetes, Agar, Oospore, Microbiology