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Resistance of the S1 layer in kempas heartwood fibers to soft rot decay

Naturally durable heartwoods, where available, continue to be used as support structures in environments considered hazardous, particularly in ground contact. However, durability of heartwoods against wood decay microorganisms varies. Therefore, it is important to evaluate heartwood products for the...

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Main Authors: Singh, Adya Prasad, Wong, Andrew H.H., Kim, Yoon Soo, Wi, Seung Gon
Format: E-Article
Language:English
Published: Brill Academic Publishers 2018
Subjects:
S Agriculture (General)
Online Access:http://ir.unimas.my/id/eprint/20127/1/Resistance%20of%20the%20S1%20layer%20in%20kempas%20heartwood%20fibers%20to%20soft%20rot%20decay%20%28abstract%29.pdf
http://ir.unimas.my/id/eprint/20127/
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85042635140&doi=10.1163%2f22941932-20170191&partnerID=40&md5=becea217621f2be795362d15157362d5
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spelling my.unimas.ir.201272019-07-12T02:18:44Z http://ir.unimas.my/id/eprint/20127/ Resistance of the S1 layer in kempas heartwood fibers to soft rot decay Singh, Adya Prasad Wong, Andrew H.H. Kim, Yoon Soo Wi, Seung Gon S Agriculture (General) Naturally durable heartwoods, where available, continue to be used as support structures in environments considered hazardous, particularly in ground contact. However, durability of heartwoods against wood decay microorganisms varies. Therefore, it is important to evaluate heartwood products for their in-service performance in order to maximise benefits derived from this valuable natural resource of limited supply. In the work presented, wood pieces from a kempas (Koompassia malaccensis) utility pole that had been placed in service in an acidic soil in Malaysia, and in time had softened at the ground-line position, were examined by light and transmission electron microscopy to evaluate the cause of deterioration. Light microscopy (LM) provided evidence of extensive attack on fibre cell walls by cavity-producing soft rot fungi. Transmission electron microscopy (TEM) revealed in greater detail the distribution and micromorphologies of cavities as well as their relationships to the fine structure of fibre cell walls, which consisted of a highly electron dense middle lamella, a moderately dense S1 layer and a multilamellar S2 layer with variable densities, reflecting differences in lignin concentration. The resistance of the moderately dense S1 layer to soft rot was a feature of particular interest and is the main focus of the work presented. The resistance appeared to be correlated with high lignification of the outermost region of the S2 wall, interfacing with the S1 layer, an unusual cell wall feature not previously described for normal wood. © 2018 International Association of Wood Anatomists, Published by Koninklijke Brill NV, Leiden. Brill Academic Publishers 2018 E-Article PeerReviewed text en http://ir.unimas.my/id/eprint/20127/1/Resistance%20of%20the%20S1%20layer%20in%20kempas%20heartwood%20fibers%20to%20soft%20rot%20decay%20%28abstract%29.pdf Singh, Adya Prasad and Wong, Andrew H.H. and Kim, Yoon Soo and Wi, Seung Gon (2018) Resistance of the S1 layer in kempas heartwood fibers to soft rot decay. IAWA Journal, 39 (1). pp. 37-42. ISSN 09281541 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85042635140&doi=10.1163%2f22941932-20170191&partnerID=40&md5=becea217621f2be795362d15157362d5 DOI: 10.1163/22941932-20170191
institution Universiti Malaysia Sarawak
building Centre for Academic Information Services (CAIS)
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Sarawak
content_source UNIMAS Institutional Repository
url_provider http://ir.unimas.my/
language English
topic S Agriculture (General)
spellingShingle S Agriculture (General)
Singh, Adya Prasad
Wong, Andrew H.H.
Kim, Yoon Soo
Wi, Seung Gon
Resistance of the S1 layer in kempas heartwood fibers to soft rot decay
description Naturally durable heartwoods, where available, continue to be used as support structures in environments considered hazardous, particularly in ground contact. However, durability of heartwoods against wood decay microorganisms varies. Therefore, it is important to evaluate heartwood products for their in-service performance in order to maximise benefits derived from this valuable natural resource of limited supply. In the work presented, wood pieces from a kempas (Koompassia malaccensis) utility pole that had been placed in service in an acidic soil in Malaysia, and in time had softened at the ground-line position, were examined by light and transmission electron microscopy to evaluate the cause of deterioration. Light microscopy (LM) provided evidence of extensive attack on fibre cell walls by cavity-producing soft rot fungi. Transmission electron microscopy (TEM) revealed in greater detail the distribution and micromorphologies of cavities as well as their relationships to the fine structure of fibre cell walls, which consisted of a highly electron dense middle lamella, a moderately dense S1 layer and a multilamellar S2 layer with variable densities, reflecting differences in lignin concentration. The resistance of the moderately dense S1 layer to soft rot was a feature of particular interest and is the main focus of the work presented. The resistance appeared to be correlated with high lignification of the outermost region of the S2 wall, interfacing with the S1 layer, an unusual cell wall feature not previously described for normal wood. © 2018 International Association of Wood Anatomists, Published by Koninklijke Brill NV, Leiden.
format E-Article
author Singh, Adya Prasad
Wong, Andrew H.H.
Kim, Yoon Soo
Wi, Seung Gon
author_facet Singh, Adya Prasad
Wong, Andrew H.H.
Kim, Yoon Soo
Wi, Seung Gon
author_sort Singh, Adya Prasad
title Resistance of the S1 layer in kempas heartwood fibers to soft rot decay
title_short Resistance of the S1 layer in kempas heartwood fibers to soft rot decay
title_full Resistance of the S1 layer in kempas heartwood fibers to soft rot decay
title_fullStr Resistance of the S1 layer in kempas heartwood fibers to soft rot decay
title_full_unstemmed Resistance of the S1 layer in kempas heartwood fibers to soft rot decay
title_sort resistance of the s1 layer in kempas heartwood fibers to soft rot decay
publisher Brill Academic Publishers
publishDate 2018
url http://ir.unimas.my/id/eprint/20127/1/Resistance%20of%20the%20S1%20layer%20in%20kempas%20heartwood%20fibers%20to%20soft%20rot%20decay%20%28abstract%29.pdf
http://ir.unimas.my/id/eprint/20127/
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85042635140&doi=10.1163%2f22941932-20170191&partnerID=40&md5=becea217621f2be795362d15157362d5
_version_ 1644513199725215744
score 13.211869

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