Occurrences of mild compression wood in agathis borneensis and dacrydium elatum
Studies on the compression wood in tropical gymnosperms are uncommon due to their limited distribution and over-exploitation. Microscopic examination of the heartwood of two tropical gymnosperms, Agathis borneensis (local name: bindang, damar minyak) and Dacrydium elatum (local name: sempilor) gr...
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Main Authors: | , , |
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Format: | E-Article |
Language: | English |
Published: |
Koninklijke Brill NV, Leiden
2015
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Subjects: | |
Online Access: | http://ir.unimas.my/id/eprint/16038/1/OCCURRENCES%20OF%20MILD%20COMPRESSION%20WOOD%20%28abstract%29.pdf http://ir.unimas.my/id/eprint/16038/ https://www.researchgate.net/publication/287405357_Occurrences_of_mild_compression_wood_in_agathis_borneensis_and_dacrydium_elatum |
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Summary: | Studies on the compression wood in tropical gymnosperms are uncommon due
to their limited distribution and over-exploitation. Microscopic examination of
the heartwood of two tropical gymnosperms, Agathis borneensis (local name:
bindang, damar minyak) and Dacrydium elatum (local name: sempilor) growing
on higher elevations in Sarawak, Malaysia showed the occurrence of mild
compression wood. Intercellular spaces were present in the compression wood
of A. borneensis, but not in D. elatum. Rounded shapes of tracheids, typical of
severe compression wood, were not observed in any of the samples examined.
In D. elatum helical cavities were present, which corresponded in location to
cell wall checks seen in cross-sectional views. The S1 layer was relatively thick
in both wood species but a distinct S3 layer was observable only in the mild
compression wood of D. elatum. Although the main feature of the mild compression
wood tracheids of both wood species was greater lignification of the
outer S2 region, autofluorescence and KMnO4 staining showed the fluorescence
and staining intensity in the corner middle lamella in some cases to be much
stronger than that in the outer part of S2 layer. |
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