Histology of canker of the Japanese cedar, Cryptomeria japonica D. DON, caused by Cercospora sequoiae ELLIS et EVERHART

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  • スギ溝腐病罹病木の組織学的研究

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Histological changes in xylem of the Japanese cedar, Cryptomeria japonica, infected with Cercospora sequoiae were investigated. Traumatic ray parenchyma were present in the vicinity of decayed parts. Hyphae were confined to the traumatic ray intercellular canal by swollen ray parenchyma. Suberin was deposited on the cell walls of traumatic ray parenchyma, and tracheids were plugged with a resin-like substance. Lignin and polyphenol were present in discolored sapwood in greater quantity than in non-discolored wood. Substances including polyphenol also occluded the tracheid lumina in the boundary between discolored and non-discolored sapwood. These changes in xylem imply resistance responses of the tree to invading fungi.

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