Histological Analysis for Mechanism of Pine Wilt Disease.

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  • Hara N.
    Laboratory of Environmental Mycoscience, Graduate School of Agriculture, Kyoto University
  • Takeuchi Y.
    Laboratory of Environmental Mycoscience, Graduate School of Agriculture, Kyoto University

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  • 「マツ枯れ」マツ材線虫病発病機構解明への組織学的アプローチ
  • マツ材線虫病発病機構解明への組織学的アプローチ
  • マツザイ センチュウビョウ ハツビョウ キコウ カイメイ エ ノ ソシキガクテキ アプローチ

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Abstract

Host pine trees infected with pine wilt disease show various histological responses. The pathogenic pinewood nematodes (Bursaphelenchus xylophilus) migrate through the resin canals in cortex and xylem, and epithelial cells surrounding resin canals are destroyed soon after nematode invasion. Lignin and suberin-like substances accumulate around the resin canals in the cortex. Various histological changes occur in xylem parenchyma cells, and after the symptom develops severely, the contents of xylem parenchyma cells spread into surrounding tracheids and incrust the tracheids and the bordered pits. In resistant pine species, cytological changes in xylem parenchyma cells are less induced than in susceptible pine species, and such changes are restricted in nematode-inoculated regions. When inoculated with avirulent isolates of pinewood nematode or avirulent nematode species (B. mucronatus), nematode distribution and histological changes are restricted in nematode-inoculated regions. The detailed mechanisms of symptom development of pine wilt disease still remain unknown, and further studies are needed to clarify them completely.

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