ヒノキ樹脂胴枯病の病態解剖

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タイトル別名
  • Histopathology of resinous canker disease of hinoki caused by <i>Monochaetia unicornis</i> (CKE. et ELL.) SACC
  • ヒノキ ジュシ ドウガレビョウ ノ ビョウタイ カイボウ

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抄録

Hinoki (Chamaecyparis obtusa S. et Z.) trees naturally infected by Monochaetia unicornis (C. et E.) S. were examined microscopically. Traumatic resin canals were formed in the secondary phloem around the necrotic lesions. The lesions extended over the traumatic resin canals. Wound periderm surrounding lesions was in various stages of development. Lesions unaccompanied by wound periderm also were observed. Lesions in the bark frequently were accompanied by flecks in the xylem. The flecks were of two types. One devel-oped from the cambium which was partially broken by the fungus and was com-posed of transformed parenchyma cells, transformed tracheids, and axial parenchy-ma cells. The other, which consisted of masses of axial parenchyma cells, was formed though cambium had not been destroyed. Finally, damaged phloem tissue was pushed out by the hypertrophy of the phloem tissue and by the division of cambial cells which followed.

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