Distribution of libriform fibers and presence of spiral thickenings in fifteen species of Acer.

摘要

Fifteen Acer species were examined to study distribution and percentage by area of their libriform fibres. The species studied include: A. barbatum, A. circinatum, A. floridanum, A. glabrum, A. grandidentatum, A. macrophyllum, A. negundo, A. oblongum, A. pennsylvanicum, A. platanoides, A. pseudoplatanus, A. rubrum, A. saccharinum and A. saccharum. Safranin-O and astra blue dissolved in alcohol solution is an effective differential staining method to identify and localize libriform fibres. They have larger lumens than fibre tracheids, intercellular spaces, and occur in various patterns, ranging from large groups to wavy bands. In some cases, they occur in radial files. The percentage by area of libriform fibres ranges from 14 to 40%. Inconspicuous to moderately visible spiral thickenings are part of the Acer libriform fibres and fibre tracheids. Differences in stain reactions and fluorescence indicate that libriform fibres differ in lignin concentration or composition from fibre tracheids - the concentration of syringyl lignin is greater in libriform fibres..