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  Selective digestion of the peptide and polysaccharide components of synthetic humic acids by the humivorous larva of Pachnoda ephippiata (Coleoptera: Scarabaeidae)

Li, X., & Brune, A. (2005). Selective digestion of the peptide and polysaccharide components of synthetic humic acids by the humivorous larva of Pachnoda ephippiata (Coleoptera: Scarabaeidae). Soil Biology & Biochemistry, 37, 1476-1483. doi:10.1016/j.soilbio.2005.01.004.

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アイテムのパーマリンク: https://hdl.handle.net/21.11116/0000-0007-C8A8-A 版のパーマリンク: https://hdl.handle.net/21.11116/0000-000D-5B64-D
資料種別: 学術論文

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 作成者:
Li, X., 著者
Brune, A.1, 著者           
所属:
1Department-Independent Research Group Insect Gut Microbiology and Symbiosis, Max Planck Institute for Terrestrial Microbiology, Max Planck Society, ou_3266271              

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キーワード: Humivory; Soil macroinvertebrates; Coleoptera; Humic acids; Peptides; Chitin; Peptidoglycan
 要旨: In order to identify the potential nutrient and energy sources of humivorous beetle larvae, we carried out feeding trials with soil supplemented with specifically 14C-labeled model humic acids synthesized by peroxidase-initiated radical polymerization, using the cetoniid beetle Pachnoda ephippiata (Coleoptera: Scarabaeidae) as a model organism. Ingestion of soil by the larvae significantly increased the mineralization of humic acids labeled in their peptide (HA-*peptide) or polysaccharide components (HA-*peptidoglycan and HA-*chitin), whereas the mineralization of humic acids labeled in the aromatic components (HA-*catechol) did not increase significantly. Mineralization was accompanied by a reduction of residual radiolabel in the acid-soluble fraction and an increase in the humic acid and humin fractions of the fecal pellets. During the gut passage, the residual label in peptide or polysaccharide components was transformed into acid-soluble products, especially in the alkaline midgut. High-performance gel-permeation chromatography demonstrated that the changes in solubility were accompanied by large changes in the molecular weight of the residual material. The amount of radiolabel derived from the peptide and polysaccharide components recovered from the larval body and hemolymph was significantly higher than that derived from the aromatic component, which supports the hypothesis that humivorous beetle larvae selectively digest the peptide and polysaccharide components of humic substances, whereas the aromatic components of humic substances are not an important source of nutrients and energy. This is also the first experimental evidence that also chitin and peptidoglycan, the major structural polymers in fungal and bacterial biomass, can be protected from microbial degradation in soil by a copolymerization with phenols and might contribute substantially to the refractory nitrogen pool in soil organic matter.

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言語: eng - English
 日付: 2005
 出版の状態: 出版
 ページ: -
 出版情報: -
 目次: -
 査読: 査読あり
 識別子(DOI, ISBNなど): eDoc: 261303
DOI: 10.1016/j.soilbio.2005.01.004
 学位: -

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出版物 1

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出版物名: Soil Biology & Biochemistry
種別: 学術雑誌
 著者・編者:
所属:
出版社, 出版地: -
ページ: - 巻号: 37 通巻号: - 開始・終了ページ: 1476 - 1483 識別子(ISBN, ISSN, DOIなど): -