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Structural Differences of Tyloses in Fraxinus Mandshurica Var. Japonica and Kalopanax Pictus

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This study reports on the occurrence and structure of tyloses in Fraxinus mandshurica Rupr. var. japonica Maxim. and Kalopanax pictus Nakai. Tyloses occurred in the outer sapwood of both species, but they showed great structural differences. Tyloses of F. mandshurica var. japonica were unique in their morphology and fine structure: thinwalled, highly lignified, multi-Iamellate, lacking parallel arrangement of microfibrils and intercellular layers; they are destroyed simultaneously with the transition from sapwood to heartwood. On the other hand, in K. pictus the cell wall organisation of tyloses was similar to those of anormal cell wall; both primary and secondary walllayers, and intercellular layers were found, and the tyloses tightly occluded vessels in both the sapwood and heartwood.


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