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

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

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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.

Item Type: Article
Uncontrolled Keywords: cell wall lignification, kempas heartwood, Koompassia malaccensis, LM, multilamellar S2 layer, soft rot cavities, TEM, unimas, university, universiti, Borneo, Malaysia, Sarawak, Kuching, Samarahan, ipta, education, research, Universiti Malaysia Sarawak
Subjects: S Agriculture > S Agriculture (General)
Divisions: Academic Faculties, Institutes and Centres > Faculty of Resource Science and Technology
Faculties, Institutes, Centres > Faculty of Resource Science and Technology
Depositing User: Ibrahim
Date Deposited: 17 Apr 2018 06:31
Last Modified: 12 Jul 2019 02:18

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