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Annals of Botany 75: 311-317, 1995
© 1995 Annals of Botany Company

Ultrastructural Investigation of Tension Wood Fibre in Fraxinus mandshurica Rupr. var. japonica Maxim.

A. K.M.A. Prodhan, J. Ohtani, R. Funada, H. Abe and K. Fukazawa

Laboratory of Wood Biology, Department of Forest Science, Faculty of Agriculture, Hokkaido University, Sapporo 060, Japan

The ultrastructure of the fibre wall in Fraxinus mandshurica Rupr. var. japonica Maxim. was investigated by electron microscopy. The trees had been inclined artificially at an angle of 30° to the vertical at the beginning of the initiation of cambial growth in early spring. The secondary walls of tension wood fibres were of the outer (S1) layer and gelatinous (G) layer type. The microfibrils in the gelatinous (G) layer were oriented as a steep Z-helix relative to the fibre axis with a deviation that ranged from 0° to 25° but was mainly between 5° and 10°. The cross-sectional surface of tension wood fibres revealed the relatively strong attachment of the G-layer to the S1 layer. The G-layer stained weakly with potassium permanganate. The S1 layer of tension wood fibres stained less strongly than that of the normal and opposite wood fibres. These results indicate that the tension wood in F. mandshurica var. japonica is not typical and is somewhat anomalous. The secondary walls of normal and opposite wood fibres were composed of two layers, S1 and S2, and lacked an S3 layer. Microfibrils in the S3 layer of juvenile stems were extremely variable in orientation and were sparsely distributed without forming a layer. By contrast, a very thin S3 layer was present in the wood fibres of mature stems. The variations in the formation of the S3 layer in the fibre walls were probably due to the differences in the cambial age of the stems of F. mandshurica Rupr. var. japonica.Copyright 1995, 1999 Academic Press

Fraxinus mandshurica Rupr. var. japonica Maxim., Japanese ash, tension wood, fibre wall, G-layer, microfibrillar orientation, normal and opposite wood, juvenile stem, field-emission scanning electron microscopy, low accelerating voltage


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