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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Lignin degradation in wood-feeding insects
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Lignin degradation in wood-feeding insects

机译：木质饲料昆虫中木质素的降解

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The aromatic polymer lignin protects plants from most forms of microbial attack. Despite the fact that a significant fraction of all lignocellulose degraded passes through arthropod guts, the fate of lignin in these systems is not known. Using tetramethylammonium hydroxide thermochemolysis, we show lignin degradation by two insect species, the Asian longhorned beetle (Anoplophora glabrip-ennis) and the Pacific dampwood termite (Zootermopsis angusti-collis). In both the beetle and termite, significant levels of propyl side-chain oxidation (depolymerization) and demethylation of ring methoxyl groups is detected; for the termite, ring hydroxylation is also observed. In addition, culture-independent fungal gut community analysis of A. glabripennis identified a single species of fungus in the Fusarium solani/Nectria haematococca species complex. This is a soft-rot fungus that may be contributing to wood degradation. These results transform our understanding of lignin degradation by wood-feeding insects.
机译：芳香聚合物木质素可保护植物免受大多数形式的微生物侵袭。尽管所有降解的木质纤维素中有很大一部分通过节肢动物肠道，但木质素在这些系统中的命运尚不清楚。使用氢氧化四甲铵进行热化学分解，我们显示出木质素被两种昆虫物种降解，即亚洲长角甲虫（Anoplophora glabrip-ennis）和太平洋湿木白蚁（Zootermopsis angusti-collis）。在甲虫和白蚁中，都检测到大量的丙基侧链氧化（解聚）和环甲氧基去甲基化；对于白蚁，还观察到环羟基化。此外，不依赖培养物的真菌对肠道菌的分析表明，茄形镰刀菌/ Nectria haematococca物种复合体中有单个真菌。这是一种软腐真菌，可能导致木材降解。这些结果改变了我们对以木材为食的昆虫降解木质素的认识。

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