Horticultural Science & Technology (원예과학기술지)

Korean Society of Horticultural Science (한국원예학회)
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Resistance of Cucurbits to Podosphaera xanthii Race 1

Podosphaera xanthii Race 1에 대한 박과 작물의 저항성

  • Lee, Ji Hyun (Research Center for Biobased Chemistry, Korea Research Institute of Chemical Technology) ;
  • Jang, Kyoung Soo (Research Center for Biobased Chemistry, Korea Research Institute of Chemical Technology) ;
  • Lee, Won Jeong (Research Center for Biobased Chemistry, Korea Research Institute of Chemical Technology) ;
  • Choi, Yong Ho (Research Center for Biobased Chemistry, Korea Research Institute of Chemical Technology) ;
  • Choi, Gyung Ja (Research Center for Biobased Chemistry, Korea Research Institute of Chemical Technology)
  • 이지현 (한국화학연구원 바이오화학연구센터) ;
  • 장경수 (한국화학연구원 바이오화학연구센터) ;
  • 이원정 (한국화학연구원 바이오화학연구센터) ;
  • 최용호 (한국화학연구원 바이오화학연구센터) ;
  • 최경자 (한국화학연구원 바이오화학연구센터)
  • Received : 2014.02.20
  • Accepted : 2014.06.08
  • Published : 2014.10.31
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Abstract

This study was conducted to establish an efficient screening method to identify cucurbits resistant to powdery mildew. Powdery mildew fungus was obtained from a single lesion of infected cucumber leaf in 2010 at Daejeon. The fungus was identified as Podosphaera xanthii race 1 based on morphological characteristics and resistance responses of four melon differentials. Development of powdery mildew caused by the fungal isolate on 34 commercial cultivars of cucumber was investigated at three plant growth stages in a greenhouse. The degree of resistance of cotyledons of each cultivar to the fungus was not correlated with that of whole plant, but powdery mildew occurrence in the first true leaf was highly correlated with resistance at the level of the whole plant. Based on these results, the first true leaf of cucurbit cultivars can be used for screening of resistance to powdery mildew. In addition, variation of resistance of commercial 12 cucumber and 26 melon cultivars to the powdery mildew fungus due to different growing seasons was tested. In the case of cucumber, the resistance response in some cultivars was influenced by growing season. The resistant cultivars showed higher resistance in the warm season than in the cool season. By contrast, the resistant melon cultivars demonstrated strong resistance in all the tested growing seasons. Interestingly, the tested powdery mildew pathogen, a member of P. xanthii race 1, was not pathogenic on seven cultivars of watermelon (Citrullus lanatus). To follow up on this, diverse race 1 isolates of P. xanthii should be collected and tested.

2010년 대전에서 채집한 흰가루병이 발생한 오이 잎의 단일 병반에서 흰가루병균을 분리하였고, 이 흰가루병균은 광학현미경 하에서의 형태학적 특성과 멜론 판별품종에서의 저항성 반응에 따라 Podosphaera xanthii race 1으로 동정되었다. 박과 작물 흰가루병에 대한 저항성 검정에 효율적인 생육시기를 결정하기 위하여, P. xanthii race 1에 대한 오이품종들의 생육시기에 따른 저항성 차이를 조사하였다. 시판중인 오이 34개 품종의 이 흰가루병균에 대한 저항성을 온실에서 3종류의 생육시기에서 실험한 결과, 떡잎에서의 저항성 반응은 본엽에서와 일치하지 않았으며, 본엽 1엽에서의 흰가루병 발생 정도는 식물 전체의 흰가루병 발생량과 높은 상관관계를 보였다. 따라서 본엽 1엽에 흰가루병이 충분히 발생하는 시기에 1엽만을 대상으로 저항성을 검정하는 것이 효율적이라 생각되었다. 또한, 박과 작물의 재배 시기에 따른 저항성 차이를 조사하기 위하여 오이 12개 품종을 4개의 재배 시기에 그리고 멜론 26개 품종을 3개의 재배시기에 흰가루병 발생을 조사하였다. 오이 품종들 중 6개 품종은 재배 시기에 따라 흰가루병 저항성에 차이를 보였으며, 온도가 올라가면 저항성이 증가함을 알 수 있었다. 이와 달리 멜론 품종들은 실험한 품종 중 5개가 고도의 저항성을 보였으며, 이들의 흰가루병 저항성은 재배 시기에 따라 거의 차이를 나타내지 않았다. 한편, 대전에서 분리한 P. xanthii race 1 균주는 수박 7개 품종에 대하여 병원성을 나타내지 않았다. 하지만 모든 P. xanthii race 1 균주가 수박에 비병원성인지는 race 1 균주를 더 많이 확보하여 확인하는 것이 필요하다.

Keywords

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