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2001 Fiscal Year Final Research Report Summary

Studies on the complexed system of environmental factors influencing on the Pine Wilt

Research Project

Project/Area Number 12460069
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 林学
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

FUTAI Kazuyoshi  Kyoto University, Agriculture, Associate Professor, 農学研究科, 助教授 (50165445)

Co-Investigator(Kenkyū-buntansha) TSUDA Mitsuya  Kyoto University, Agriculture, Professor, 農学研究科, 教授 (10026578)
Project Period (FY) 2000 – 2001
Keywordssimulated acid rain / pine wilt disease / mycorrhizae / water stress / Japanese red pine / Japanese black pine / histochemical survey / Bursaphelenchus xylophilus
Research Abstract

The complexed system of some environmental factors such as acid rain, water status in soil, mycorrhizal symbiont and so on were studied in relation to development of pine wilt disease. Japanese red pine trees exposed to simulated acid rain at pH 3 for more than 3 years have shown neither wilt symptom nor significant reduction in resin exudation. Simulated acid rain at pH 2 always showed deteriorative effect on 6 month-old pine seedlings which had then inoculated with pathogenic nemtodes, while pH 3 acid rain had both promotive and supressive effects on development of Pine Wilt disease.
Histochemical survey was also conducted for the shoot segments of Japanese black pine saplings. When inoculated with pathogenic nematode, Bursaphelenchus xylophilus some unknown lipophilic substance(s) leaked out of xylem parenchimatous cells, and covered the pit membrane of xylem, thus the valve function of the pit membrane must be damaged, thereby water conduction must be hindered.
Pine wilt disease is promoted its symptom development by water stress and/or drought.If mycorrhizae are well-developed, these symbionts may supply water arid minerals via their fine mycellium extending into surrounding soil. Acid precipitation applied for either terrestrial or under ground parts of pine seedlings make damage on mycorrhizal system of the pine trees, thereby damaged water and nutrient supply via mycorrhizal symbionts.

  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] Asai, E., Futai, K.: "The effects of long-term exposure to simulated acid rain on the development of pine wilt disease caused by Bursaphyelenchus xylophilus"Forest pathology. 31. 241-253 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Asai, E., Futai, K.: "Retardation of pine wilt disease symptom development in Japanese black pine seedlings exposed to simulated acid rain and inoculated with Bursaphelenchus xylophilus"Journal of Forest Research. 6. 297-302 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Asai, E., Futai, K.: "Promotion of the population growth of pinewood nematode in 4-month old Japanese black pine seedlings by the pretreatment with simulated acid rain"Journal of Forest Research. (in press).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 原 直樹, 二井 一禎: "マツノザイセンチュウ感染によるクロマツ木部放射柔細胞の変化と周辺仮道管への影響"日本林学会誌. 83. 285-289 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Asia, E. and Futai, K.: "The effects of long-term exposure to simulated acid rain on the development of pine wilt disease caused by Bursaphyelenchus xylophilus"Forest pathology. 31. 241-253 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Asai, E. and Futai, K: "Retardation of pine wilt disease symptom development in Japanese black pine seed-lings exposed to simulated acid rain and inoculated with Bursaphelenchus xylophilus"Journal of Forest Research. 6. 297-302 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Asai, E. and Futai, K: "Promotion of the population growth of pinewood nematode in 4-month old Japanese black pine seedling by the pretreatment with simulated acid rain"Journal of Forest Research. (in press).

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2003-09-17  

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