Characteristics of Phytophthora capsici Causing Pepper Phytophthora Blight Resistant to Metalaxyl

Metalaxyl에 대한 저항성 고추 역병균의 특성

  • Lee, Soo-Min (Department of Plant Medicine, College of Agriculture, Life and Environment Science, Chungbuk National University) ;
  • Shin, Jin-Ho (Department of Plant Medicine, College of Agriculture, Life and Environment Science, Chungbuk National University) ;
  • Kim, Sun-Bo (Department of Plant Medicine, College of Agriculture, Life and Environment Science, Chungbuk National University) ;
  • Kim, Heung-Tae (Department of Plant Medicine, College of Agriculture, Life and Environment Science, Chungbuk National University)
  • 이수민 (충북대학교 농업생명환경대학 식물의학과) ;
  • 신진호 (충북대학교 농업생명환경대학 식물의학과) ;
  • 김선보 (충북대학교 농업생명환경대학 식물의학과) ;
  • 김흥태 (충북대학교 농업생명환경대학 식물의학과)
  • Published : 2009.12.31

Abstract

Isolation frequency of resistant isolates of Phytophthora capsici to metalaxyl was reported to be 38.9% through the resistance monitoring for metalaxyl in P. capsici causing pepper Phytophthora blight. Metalaxyl was very effective to mycelium growth, while not to zoosporangium germination and zoospore release. $EC_{50}$ values of metalaxyl in the inhibition of mycelium growth were 0.204, 0.151, 0.379, and $0.215\;{\mu}g\;mL^{-1}$ against each isolate sensitive to the fungicide as P. capsici 06-119, 06-143, P08-7, and P08-31, respectively, whilst those were 5.242, 5.724, 6.621, and $5.377\;{\mu}g\;mL^{-1}$ in P. capsici 06-125, 06-155, P08-50, and P08-60. For the field fitness, several factors, which were mycelium growth, zoosporangium germination, zoospore release, virulence to pepper plants, and the zoosporangium and the oospore production, were investigated with 4 sensitive isolates and 4 resistant isolates. Between 2 groups differentiated by the sensitivity of metalaxyl, there was no significance in mycelium growth, zoosporangium germination, zoospore release, and virulence to pepper plants. However, the zoosporangium and the oospore production in each resistant isolate, which were related to survival of P. capsici in fields, were superior to those of sensitive isolates. Based on results of this study, it was suggested that the increase of the percentage of resistant isolates to metalaxyl resulted from the high capacities of the zoosporangium and the oospore production.

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