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  • 1
    ISSN: 1432-5225
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary Variations in tracheid length and morphological features of tracheid tips within a growth ring associated with the development of compression wood were observed in young trees of Larix leptolepis Gord. and Abies firma Sieb. et Zucc. A reduction in tracheid length occurred with the development of compression wood within a growth ring. Such a decrease in tracheid length was considered to have resulted from a conspicuous increase in the frequency of cell divisions. Formation of compression wood was also accompanied by an increase in certain morphological features of the tracheid tips, indicating that the intrusive growth of the tracheid tips did not proceed smoothly in compression wood. A negative correlation between the tracheid length and the occurrence of abnormal tracheid tips was established in a growth ring containing compression wood. Whereas the variance of tracheid length increased with increasing tracheid length in normal wood, no such relationship could be observed in compression wood.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Wood science and technology 27 (1992), S. 1-10 
    ISSN: 1432-5225
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary Anatomical differences in xylem between the upper and lower sides formed in the inclined stems of Buxus microphylla with different angular displacement from the vertical were examined microscopically. B. microphylla exhibited a pronounced growth promotion on the lower side of the inclined stems. Formation of tension wood (gelatinous fibers) was not observed. Xylem formed on the lower side showed some interesting features resembling the compression wood formed in gymnosperms. The reaction wood tracheids and vessels showed an excessive lignification in their secondary walls but lacked both helical cavities and an S3 layer, features that were almost the same as those of primitive gymnosperms. These results indicate that B. microphylla has an ability to form compression wood, suggesting that in the genus Buxus a different mechanism in the conducting elements was developed in the phylogenetic evolution.
    Type of Medium: Electronic Resource
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