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题名: Coprinus comatus damages nematode cuticles mechanically with spiny balls and produces potent toxins to immobilize nematodes
作者: Luo, Hong; Liu, Yajun; Fang, Lin; Li, Xuan; Tang, Ninghua; Zhang, Keqin
刊名: APPLIED AND ENVIRONMENTAL MICROBIOLOGY
关键词: BIOLOGICAL-ACTIVITIES ; NEMATOPHAGOUS FUNGI ; STEPHANOCYSTS ; NEMATOCTONUS ; METABOLITES
英文摘要: We reported recently a unique fungal structure, called the spiny ball, on the vegetative hyphae of Coprinus comatus (O. F. Mull.:Fr.) Pers. Although some observations regarding the role of this structure were presented, its function remained largely unknown. In this study, we showed that purified (isolated and washed) spiny balls could immobilize and kill the free-living nematode Panagrellus redivivus Goodey highly efficiently. Scanning electron microscopy studies illustrated that the spiny structure damaged the nematode cuticle, suggesting the presence of a mechanical force during the process of nematode immobilization. Severe injuries on nematode cuticles caused the leakage of inner materials of the nematodes. When these structures were ground in liquid nitrogen, their killing efficacy against nematodes was lost, indicating that the shape and the complete structure of the spiny balls are indispensable for their function. However, extraction with organic solvents never lowered their activity against P. redivivus, and the extracts showed no obvious effect on the nematode. We also investigated whether C comatus was able to produce toxins which would aid in the immobilization of nematodes. In total, we identified seven toxins from C. comatus that showed activity to immobilize the nematodes P. redivivus and Meloidogyne incognita (Kofoid et White) Chitwood. The chemical structures of these toxins were identified with nuclear magnetic resonance, mass spectrometry, infrared, and LTV spectrum analysis. Two compounds were found to be novel. The toxins found in C. comatus are O-containing heterocyclic compounds.
出版日期: 2007-06-01
卷号: 73, 期号:12, 页码:3916-3923
DOI标识: 10.1128/AEM.02770-06
语种: 英语
ISSN号: 0099-2240
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/2071
Appears in Collections:植物化学与西部植物资源持续利用国家重点实验室_期刊论文

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作者单位: 1.Yunnan Univ, Lab Conservat & Utilizat Bioresources, Yunnan 650091, Peoples R China
2.Yunnan Normal Univ, Middle Sch Attached, Yunnan 650106, Peoples R China
3.Kunming Univ Sci & Technol, Fac Environm Sci & Engn, Kunming 650093, Peoples R China
4.Chinese Acad Sci, Kunming Inst Bot, State Key Lab Phytochem & Plant Resources W China, Kunming 650204, Peoples R China

Recommended Citation:
Luo, H; Liu, YJ; Fang, L; Li, X; Tang, NH; Zhang, KQ.Coprinus comatus damages nematode cuticles mechanically with spiny balls and produces potent toxins to immobilize nematodes,APPLIED AND ENVIRONMENTAL MICROBIOLOGY,2007,73(12):3916-3923
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