Changes in wood-water relations in acetylated wood over the course of Rhodonia placenta brown rot decay

IF 3.4 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Tiina Belt, Michael Altgen
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Abstract

Acetylation greatly increases the decay resistance of wood, but even highly acetylated wood can be degraded by fungi if given sufficient time. This study investigated the degradation of acetylated wood by the brown rot fungus Rhodonia placenta, aiming to understand the fungal-induced changes in wood-water relations that are associated with decay. Acetylated samples as well as unacetylated references were exposed to R. placenta in a stacked-sample decay test to generate samples in different stages of decay. The decayed samples were used to investigate changes in acetyl content, water vapour sorption, and maximum cell wall moisture content as measured by solute exclusion. R. placenta caused high mass losses in acetylated wood, but preferential deacetylation was seen only in highly acetylated samples in the early stages of decay. Acetylated samples showed increased hygroscopicity in sorption measurements as a result of R. placenta degradation, particularly at high relative humidity in desorption from the undried decaying state. The increase was very strong in the highly acetylated samples and took place at low mass losses, indicating that it may be at least partially related to the deacetylation of the wood material. Degradation also increased maximum cell wall moisture content, but the increase was stronger in the references than the acetylated samples, suggesting that the acetyl groups remaining in the samples continue to provide a cell wall bulking effect.

褐腐腐烂过程中乙酰化木材木水关系的变化
乙酰化大大增加了木材的耐腐性,但即使高度乙酰化的木材也可以被真菌降解,如果给予足够的时间。本研究研究了褐腐菌胎盘Rhodonia对乙酰化木材的降解,旨在了解真菌诱导的与腐烂相关的木水关系的变化。将乙酰化的样品和未乙酰化的对照物暴露在胎盘中,进行堆叠样品衰变试验,产生不同衰变阶段的样品。用腐烂样品研究乙酰含量、水蒸气吸收量和溶质排斥测定的最大细胞壁水分含量的变化。在乙酰化的木材中,羊胎草造成了大量的质量损失,但只有在腐烂早期高度乙酰化的样品中才出现优先去乙酰化。乙酰化的样品在吸附测量中显示出由于胎盘素降解而增加的吸湿性,特别是在从未干燥的腐烂状态解吸的高相对湿度下。在高度乙酰化的样品中,这种增加非常强烈,并且发生在低质量损失的情况下,这表明它可能至少部分与木材材料的去乙酰化有关。降解也增加了细胞壁的最大水分含量,但参考样品的增加比乙酰化样品的增加更强,这表明残留在样品中的乙酰基继续提供细胞壁膨胀效应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
8.60
自引率
0.00%
发文量
1
审稿时长
13 weeks
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