Research in Plant Disease (식물병연구)

The Korean Society of Plant Pathology (한국식물병리학회)
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Effects of Fusarium circinatum on Disease Development and Gas Exchange in the Seedlings of Pinus spp.

푸사리움가지마름병균 Fusarium circinatum이 소나무류 묘목의 병 진전과 침엽의 가스교환에 미치는 영향

  • Received : 2011.06.06
  • Accepted : 2011.08.23
  • Published : 2011.08.31
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Abstract

Four-year-old seedlings of Pinus thunbergii, Pinus densiflora and Pinus rigida were inoculated with Fusarium circinatum isolate (FT-7), the pitch canker fungus, from P. thunbergii, to evaluate the effects of the pathogen on disease development and gas exchange rate. Needle dehydration was evident on 2 of 10 seedlings of P. thunbergii and P. rigida at 18 and 21 days after inoculation, respectively, while no symptoms were observed in P. densiflora seedlings throughout the experiment. Gas exchange stopped completely in 4 of 5 measured seedlings of P. thunbergii and 2 of 5 measured seedlings of P. rigida at 25 days after inoculation, and in the remaining 3 seedlings of P. rigida at 39 days after inoculation. Disease development in P. thunbergii seedlings was faster than that in P. rigida seedlings. By the time, the experiment was ended at 78 days after inoculation, 9 of 10 seedlings of P. rigida and 8 of 10 seedlings of P. thunbergii seedlings treated with FT-7 was almost dead, but all seedlings of P. densiflora were still healthy. We suggest that P. densiflora is resistant to F. circinatum in the current study, and gas exchange rate of the species after inoculation does not differ significantly compared to that of untreated control.

해송에서 분리한 Fusarium circinatum(FT-7)을 2009년 7월 21일에 4년생 해송, 소나무 및 리기다소나무 묘목에 인공접종한 후 병 진전 및 가스교환 특성을 조사하였다. 접종 18일 후 해송 10본 중 2본에서, 그리고 접종 21일후에는 리기다소나무 10본 중 2본에서 각각 침엽탈수 증상이 나타났으나 소나무는 실험기간동안 아무런 증상이 나타나지 않았다. 해송의 경우 가스교환율 모니터링을 실시한 5본 중 4본이 접종 25일 후 가스교환이 완전히 멈추었으나 리기다소나무는 5본 중 2본이 25일 이내, 나머지 3본은 39일 후 완전히 정지하는 것으로 나타나 해송의 병 진전도가 리기다소나무에 비해 더 빠른 것으로 나타났다. 실험기간인 78일 동안 리기다소나무 10본 중 9본, 해송 10본 중 8본이 거의 고사하였으나 소나무는 아무런 피해 증상이 나타나지 않았다. 본 연구 결과, 소나무는 F. circinatum(FT-7)에 저항성이 있는 수종으로 나타났으며 인공접종 후 가스교환율은 대조구와 유사한 양상을 보였다.

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References

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