The sapro-rhizosphere: Carbon flow from saprotrophic fungi into fungus-feeding bacteria
The sapro-rhizosphere: Carbon flow from saprotrophic fungi into fungus-feeding bacteria
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DOI：
10.1016/j.soilbio.2016.06.014
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发表时间：
2016-11-01
影响因子：
9.7
通讯作者：
de Boer, Wietse
中科院分区：
文献类型：
--
作者：
Ballhausen, Max-Bernhard;de Boer, Wietse
来源于根的、不稳定的有机化合物被认为主要通过菌根真菌和细菌的消耗进入根际食物网。然而，通过稳定同位素探测（SIP）追踪根源碳命运的研究表明，腐养真菌作为根渗出物的消费者发挥了重要作用。此外，研究表明，一组不同的根际细菌具有从腐养真菌菌丝中提取碳的能力。基于腐坏性根际真菌的快速碳流和具有分枝能力的根际细菌的广泛存在，我们认为当前的根际碳流概念应该进行修订，以考虑更复杂的微生物食物网相互作用。我们建议将生长在根际生态位的细菌分为“植食菌”和“食菌菌”。后者将包括以真菌的所有功能群为食的根际细菌，即包括菌根。为了说明腐养真菌作为根际细菌的食物来源的重要性，我们引入了一个新的生态位，“腐殖质根际生态位”。我们希望激发对根际碳流的讨论，挑战将根际碳流划分为仅由主要消费者组成的细菌和真菌通道，并指出基于腐殖质根际概念的研究方向。(C) 2016 Elsevier Ltd.版权所有。
Root-derived, labile organic compounds are thought to enter the rhizosphere food web mainly via consumption by mycorrhizal fungi and bacteria. Studies tracking the fate of root derived carbon via stable isotope probing (SIP), however, indicate an important role for saprotrophic fungi as consumers of root exudates. In addition, it was shown that a diverse group of rhizosphere bacteria have the ability to withdraw carbon from saprotrophic fungal hyphae. Based on the fast carbon-flow into saprotrophic rhizosphere fungi and the wide-spread occurrence of rhizosphere bacteria with mycophagous abilities, we argue that the current concept of rhizosphere carbon flow should be revised to account for more complex microbial food web interactions. We propose to split the bacteria thriving in the rhizosphere niche into "plant-feeders" and "fungus-feeders". The latter would include rhizosphere bacteria feeding on all functional groups of fungi, i.e. including mycorrhiza. To indicate the importance of saprotrophic fungi as a food source for rhizosphere bacteria, we introduce a new niche, the "sapro-rhizosphere niche". We want to stimulate a discussion on rhizosphere carbon flow by challenging the established division into a mere bacterial- and fungal channel consisting, of primary consumers, and to point at research directions based on the sapro-rhizosphere concept. (C) 2016 Elsevier Ltd. All rights reserved.