The Korean Journal of Mycology (한국균학회지)

The Korean Society of Mycology (한국균학회)
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Metalaxyl Sensitivity Related with Distribution Feature of Mating Type of Phytophthora capsici Population from Red Pepper in Korea

국내 고추역병균 Phytophthora capsici 집단의 교배형 분포 특성에 따른 Metalaxyl 감수성

  • Published : 2003.08.30
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Abstract

Metalaxyl sensitivity related with distribution feature of mating type was characterized far Phytophthora capsici population, totally 433 isolates of the red-pepper pathogen collected from 75 pepper fields in Korea from 1995 to 1998. At the concentration of metalaxyl $2{\mu}g/ml$, inhibition rate of mycelial growth of P. capsici isolates was 68.2% in average compared to control, and 28.6% isolates in average were estimated as resistance to the chemical. Isolates of field unit with a single mating type revealed similar level of sensitivity to metalaxyl and showed sensitive or resistant in most field units. However, isolates of field units with both mating types revealed diverse sensitivity level to the chemical and various occurrence ratio of metalaxyl sensitive : resistant in each field unit. Results indicated that different levels of metalaxyl sensitivity of P. capsici population in Korea seem to be closely related with occurrence ratio of A1 : A2 mating type of each field.

1995년부터 1998년까지 75곳의 국내 고추포장들로부터 수집된 433개의 고추역병균 Phytophthora capsici 집단의 교배형 분포 특성에 따른 metalaxyl 감수성을 분석하였다. Metalaxyl $2{\mu}g/ml$ 농도에서 P. capsici 집단의 평균 균사생장 저해율은 68.2%였으며, 저항성균의 발생율은 평균 28.6%였다. 포장단위별로 metalaxyl에 대한 반응을 조사한 결과 A1형 또는 A2형 단일 교배형만 출현한 포장들의 균주들은 서로 비슷한 수준의 감수성을 나타냈으며, 대부분 포장단위별로 약제 감수성이나 저항성 중의 하나로 구분됐다. 그러나 교배형이 혼재하여 분포하는 각 포장단위별 균주들간의 약제에 대한 반응은 단일교배형 포장균주들에 비해 매우 다양했으며, 포장별로 저항성균의 발생비율도 다양했다. 이러한 결과들은 국내에 분포하는 고추역병균 P. capsici 집단의 metalaxyl 약제에 대한 다양한 감수성이 각 포장단위별 A1 : A2교배형 발생비와 매우 밀접한 관계가 있다는 것을 의미한다.

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