茂み状の菌根菌は分解を加速し,有機物から直接窒素を吸収する
A Hodge1, C D Campbell, A H Fitter
1Department of Biology, University of York, PO Box 373, York, YO10 5YW, UK. ah29@york.ac.uk
Nature
|September 21, 2001
まとめ
重要な植物共生体である状菌類は,宿主植物とは独立して有機物を分解し,窒素を捕獲することができます. これは,栄養素を植物にのみ依存しているという見解に異議を唱える.
科学分野:
- 菌類学 菌類学とは
- 植物病理学 植物病理学
- 土壌科学 土壌科学は,土壌の科学である.
背景:
- 樹木状の菌根菌 (AMF) は,ほとんどの植物種と共生を形成する.
- AMFは伝統的に,炭素を植物に依存する,義務的バイオトロフと考えられています.
- 有機物質を分解し,栄養素を直接吸収する彼らの能力は議論されている.
研究 の 目的:
- AMFのサポトロフィ的能力を調査する.
- AMFが有機物質からの分解と窒素の捕獲を強化できるかどうかを判断する.
- これらのプロセスにおける宿主植物の役割を評価する.
主な方法:
- 土壌実験で複雑な有機物質として草の葉を利用した.
- 宿主植物の存在または不在で監視された真菌ヒファの成長.
- 評価された分解速度と有機物からの窒素の捕獲.
主要な成果:
- 茂み状の菌根性シンビオシスは,草の葉の分解を高めました.
- 有機物質からの窒素捕獲の増加が観察されました.
- 菌類のヒファの成長は,宿主植物とは独立した有機物質によって刺激された.
結論:
- AMFはサプトロフィックの能力を持ち,土壌の有機物質の分解を高めます.
- この共生は,有機源から栄養素の吸収を促進し,植物への依存を潜在的に軽減します.
- AMFは,土壌生態系における栄養循環に積極的に貢献することができます.
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