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Cell biology of host resistance to the disease caused by pine-wood nematodes

Research Project

Project/Area Number 06454088
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 林学
Research InstitutionThe University of Tokyo

Principal Investigator

HOGETSU Taizo  The University of Tokyo, Asian Natural Environmental Science Center, Professor, アジア生物資源環境研究センター, 教授 (10107170)

Co-Investigator(Kenkyū-buntansha) FUKUDA Kenji  The University of Tokyo, Graduate School of Agricultural and Life Sciences, Lect, 大学院・農学生命科学研究科, 講師 (30208954)
Project Period (FY) 1994 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥7,200,000 (Direct Cost: ¥7,200,000)
Fiscal Year 1996: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1995: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1994: ¥5,300,000 (Direct Cost: ¥5,300,000)
Keywordssymptom development / resistent species / induced resistance / interaction substance / filter experiment / age of nematode / nematode proliferation / early stage of the disease / 物質的相互作用 / 皮層樹脂道 / エピセリウム細胞の破壊 / 柔組織の細胞死 / 剥離樹皮片
Research Abstract

1. The role of corical resin canals in the early development of a pine wilt disease in Japanese black pine, pinus thunbergii, was studied. A part of the bark of a 2 cm-long segment from a current-year stem was removed by a tangential cut with a razor blade. Both cortex-exposed segments with cut corical resin canals (deignated as +RC-segments) and those without cut resin canals (-RC-segments) were obtained by chance. When a virulent nematode isolate (S6-1) was inoculated onto the cut surface, the surface of the +RC-segments turned brown 4 d after inoculation, and, in some segments, this browning occurred more intensely around cortical resin canals. When segments were cut transversely at the middle, the transverse cut surface of the inoculated +RC-segments was brown and fragile but that of the inoculated -RC-segments was pale green and stable as the non-inoculated controls. Correspondingly, tissue cells including epithelial cells of the cortical resin canal of the +RC-segments were all d … More ead but those of the -RC-segments were alive as the controls. When nematodes were inoculated onto the inner surface (cambium side) of a bark peeling at which cambial xylem cells were exposed, they did not kill the cambial cells. When inoculated on the transverse cut-end of a bark peeling from which nematodes would enter resin canals, nematodes killed all cells in the peeling. The above results suggest that nematodes do not kill directly cortical cells but become harmful to pine cells after living in cortical resin canals.
2. We examined then harmfulness of nematodes at different growth stages and found that nematodes those at older stages do not kill pine cells but those at younger stages do.
3. We found by experiments using cortex-exposed segments and filter wells that nematodes at younger stages killed pine cells even but not those at older stages, when filter was inserted between them, preventing nematodes from direct contact with pine tissue. This result means that nematodes at younger stages produce and excrete some killing substances but not those at older stages.
4. We examined next the difference in resistance aginst nematodes between Pinus species which are more resistant than P.thunbergii, using cortex-exposed segments and bark peelings of young stems. Cortex-exposed segments and bark peelings of young stems of more resistant species were not killed by nematodes at younger stages, indicating that the resistance is derived from resistance of tissue cells of itself.
3. We confirmed resistance induction by preinfection with an avilurent strain of nematode, and studied the mechanism of the resistance induction anatomically. Less

Report

(4 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • 1994 Annual Research Report
  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 寳月岱造、石田京子、鈴木和夫、勝木俊雄: "数種のマツの切り枝および樹皮片におけるマツザイセンチュウに対する組織抵抗性" 日本林学会誌. 76. 471-472 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Fukuda,K.,Hogetsu,T.and Suzuki,K.: "Ethylene production during symptom development of pine-wilt disease." Eur.J.For.Pathol.24. 193-202 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Ishida,K.and Hogetsu,T.: "Role of resin canals in the early stages of pine wilt disease caused by the pine wood nematode." Can.J.Bot.2月号. (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Hogetsu, T., Ishida, K., Suzuki, K., Katuki, T.: "Tissue resistance in cuttings and bark peelings of various pine species against attack by the pine wood nematode." J.Jpn. For. Soc.76. 471-472 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Fukuda, K., Hogetsu, T.and Suzuki, K.: "Ethylene production during symptom development of pine-wilt disease." Eur. J.For. Pathol.24. 193-202 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Ishida, K.and Hogetsu, T.: "Role of resin canals in the early stages of pine wilt disease caused by the pine wood nematode." Can. J.Bot. Feb. issue. (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Fukuda, K.: "Physiological process of the symptom development and resistance mechanism in pine wilt disease." J.For. Res.(submitted).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Ishida,K.and Hogetsu,T.: "Role of resin canals in the early stages of pine wilt disease caused by the pine wood nematode" Canadian Journal of Botany.

    • Related Report
      1996 Annual Research Report
  • [Publications] 寳月岱造,他: "数種のマツ切り枝および樹皮片におけるマツノザイセンチュウに対する組織抵抗性" 日本林学会誌. 76. 471-474 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Fukuda,K. 他: "Ethylene production during symptom development of pine-wilt disease." European Journal of Forest Pathology. 24. 193-202 (1994)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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