Mating type and metalaxyl sensitivity of Phytophthora infestans isolated from Kangwon area in Korea

강원 지역에서 분리한 감자역병균(Phytophthora infestans)의 교배형(mating type) 및 metalaxyl 저항성

  • Kim, Byung-Sup (Department of Horticulture, Kangnung National University) ;
  • Choi, Jin-Hoe (Department of Horticulture, Kangnung National University) ;
  • Chun, Whan-Hong (Department of Horticulture, Kangnung National University) ;
  • Ryu, Kyoung-Yul (Division, National Alpine Agriculture Experiment Station) ;
  • Hahm, Young-Il (Division, National Alpine Agriculture Experiment Station) ;
  • Lee, Youn-Su (Department of Applied Plant Science, Kangwon National University)
  • 김병섭 (강릉대학교 원예학과) ;
  • 최진희 (강릉대학교 원예학과) ;
  • 전환홍 (강릉대학교 원예학과) ;
  • 류경열 (고령지농업시험장 작물과) ;
  • 함영일 (고령지농업시험장 작물과) ;
  • 이윤수 (강원대학교 식물응용과학부)
  • Published : 2000.03.31

Abstract

Isolates of Phytophthora infestans obtained from several locations of Kangwon area in 1998 and 1999 were examined on mating types and sensitivity to metalaxyl. Both A1 and A2 mating type isolates were isolated in 1998 and 1999. The majority of the P. infestans isolates were A1 mating type. About 64.3% of the isolates collected in 1998 and 99.1% in 1999 were determined as A1 mating type. Sensitivity of the P. infestans to metalaxyl was examined by measuring mycelial growth on V8 juice agar amended with $10{\mu}g/mL$ matalaxyl. About 44.6% of the isolates examined in 1988 were resistant to metalaxyl, 55.4% of the isolates were intermediate resistant, but sensitive isolate was not isolated. However, 10.5% of the isolates examined in 1999 were sensitive, 88.6% of the isolates were intermediate resistant, and 0.9% of the isolates were resistant to metalaxyl. This studies indicate that A1 mating type is displacing A2 mating type and metalaxyl sensitivity of the P. infestans isolates of Kangwon area is increasing. This result is quite different from trends of early in 1990s.