Parasitic Characteristics of Ampelomyces quisqualis 94013 to Powdery Mildew Fungus of Cucumber

Ampelomyces quisqualis 94013의 오이흰가루병균에 대한 기생적 특성

  • Lee, Sang-Yeob (Division of Plant Pathology, National Institute of Agricultural Science and Technology, Rural Development Administration) ;
  • Kim, Hong-Gi (Department of Agricultural Biology, Chungnam National University)
  • 이상엽 (농촌진흥청 농업과학기술원 식물병리과) ;
  • 김홍기 (충남대학교 농과대학 농생물학과)
  • Published : 2001.10.30

Abstract

An isolate of the prospective hyperparasite, Ampelomyces quisqualis 94013 (AQ94013) was selected for the use of biological control of cucumber powdery mildew caused by Sphaerotheca fuliginea. Examination for the parasitism processes by scanning electron microscopy and light microscopy showed that conidia of AQ49013 germinated on conidia, conidiophores and hyphae of Sphaerotheca fuliginea four hours after inoculation. Appressorium-like structures were developed and attached to the hyphae of S. fuliginea seventeen hours after inoculation. Hyphae of AQ94013 penetrated into hyphae of S. fuliginea twenty-four hours after inoculation. Pycnidia of AQ94013 were produced in the hyphae and the basal part of conidiophores of S. fuliginea fourty four hours after inoculation. The pycnidia of AQ94013 matured foully eight hours after inoculation, and the conidia were discharged from the ostioles of the pycnidia fifty two hours after the inoculation. At the same time, hyphae and conidiophores of S. fuliginea were distorted and died. Also, concentrated culture filtrate and culture filtrate of AQ94013 had not suppressed the cucumber powdery mildew fungus as water treatment. Therefore, mode of action of AQ94013 was assumed to be parasitism on powdery mildew fungi.

흰가루병에 대하여 생물적 방제제로 선발된 Ampelomyces quisqualis94013(AQ94013)의 포자현탁액을 처리하여 오이 흰가루병균(Sphaerotheca fuliginea)에 대한 침입과정을 전자현미경과 광학현미경으로 관찰한 결과, 포자현탁액 처리 후 4시간 만에 포자가 흰가루병균의 분생포자, 분생자경 및 균사위에서 발아하고, 17시간 후에는 유사부착기가 형성되어 흰가루병균의 균사에 부착되었다. 24시간 후에는 균사내에 침입하였으며, 44시간 후에는 흰가루병균의 균사와 분생자경의 하부에 AQ94013의 병자각이 형성되기 시작했다. 48시간 후에는 병자각이 성숙되었으며, 52시간 후에는 병자각의 공구에서 병포자가 분출되고, 흰가루병균의 균사 및 분생자경은 변형되어 죽었다. 한편, 오이흰가루병균에 대하여 A. quisqualis 94013의 배양여액을 농축하여 처리한 결과에서 물처리와 차이가 없었으므로 흰가루병균에 대한 감염기작은 A. quisqualis 94013가 독소생성에 의한 것이 아니라 직접기생에 의하여 흰가루병균을 죽이는 것으로 판단된다.

Keywords

References

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