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Xylella fastidiosa의 배양여액을 이용한 포도나무 피어스병 품종 저항성 검정

Evaluation of resistance to Pierce's disease among grapevine cultivars by using the culture filtrates produced from Xylella fastidiosa

  • Park, Myung Soo (School of Biological Sciences and Institute of Microbiology, Seoul National University) ;
  • Lu, Jiang (School of Agriculture and Biology, Shanghai Jiao Tong University) ;
  • Yun, Hae Keun (Department of Horticulture and Life Science, Yeungnam University)
  • 투고 : 2017.11.03
  • 심사 : 2017.11.29
  • 발행 : 2017.12.31

초록

포도나무 피어스병에 대한 품종간 저항성을 검정하는 데에 이용되는 병원균 접종법이나 포장저항성 검정법을 대체할 수 있는 방법으로 병원균(Xylella fastidiosa)이 생산하는 배양여액을 이용할 수 있는 검정법을 개발하고자 하였다. 상처를 가한 포도나무 잎에 병원균의 배양여액을 처리한 결과 독성이 발현되었으며 품종간에 차이가 나타났다. 병원균 배양여액의 에틸아세테이트 추출물은 공시한 포도나무에서 배양여액 처리와 동일한 반응을 유도하였다. 병원균 배양여액의 독성과 감수성은 에틸아세테이트 추출물과 동일하였다. 감수성 품종은 높은 비율로 희석된 배양여액에도 감수성을 나타내었으며, 저항성품종은 원액에서도 반응하지 않았다. 감수성 품종은 희석된 배양여액보다 원액에서 감수성이었으나 저항성 품종은 원액에도 저항성을 나타내었다. 본 연구에서 유럽종 포도 품종이 중도 감수성이었으나, 배양여액을 이용한 피어스병해 저항성 검정은 병해에 저항성인 유전자원 선발과, 교배조합의 저항성 실생의 조기에 선발에 중요한 기술로서, 향후 병해에 저항성인 포도품종 육성에 크게 기여할 것으로 여겨진다.

This study investigated whether culture filtrates produced by Xylella fastidiosa can be used to determine the varietal susceptibility to Pierce's disease in grapevines (Vitis spp.) as a substitute for pathogen inoculation or field screening. A bioassay of grape leaves with culture filtrates from the pathogen showed that their phytotoxicities were active and host-selective. Ethyl acetate extracts from them also showed toxicities and host selectivity in both bunches of grapes and muscadine grapes. The sensitive range of plants to the culture filtrates and their ethyl acetate extracts was consistent with the host range of the Pierce's disease pathogen. Susceptible cultivars are sensitive to even highly diluted culture filtrates, while resistant cultivars were not affected even at their original culture filtrates. Susceptible cultivars were more sensitive to the undiluted culture filtrate than were highly diluted culture filtrates, and the younger leaves were the most sensitive to the culture filtrates in grapes. Although some European grape cultivars showed moderately susceptibility in this study, the determination of varietal resistance to Pierce's disease by the treatment of culture filtrates of pathogens could provide valuable information for the preliminary selection of genetic resources and seedlings from hybridization in a disease resistant grape breeding program.

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