Arbuscular mycorrhizal (AM) symbiosis is heavily and positively implicated in phosphorus (P) acquisition from soil to plants, including many important agricultural crops. Its role in plant nitrogen (N) nutrition is generally not as prominent or beneficial, with exception of some situations when N is available predominantly in organic forms. Yet the AM fungi (AMF) are, due to their poor exo-enzymatic repertoire, unlikely to degrade organic compounds on their own, therefore they possibly depend on other microorganisms to liberate nutrients contained in those materials. Here, we review current knowledge on the roles played by the AMF in plant N nutrition in general and uptake of N from organic compounds in particular, with a specific reference to microbes and processes involved in liberation and AM fungal utilization of N from organic compounds. Future research needs and directions are outlined, as is the agronomic and societal context of such research.

中文翻译：

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丛枝菌根和土壤有机氮：参与者和相互作用的网络

丛枝菌根（AM）的共生与从土壤到植物（包括许多重要的农作物）的磷（P）的吸收密切相关。它在植物氮（N）营养中的作用通常不那么突出或有益，除了某些情况下，氮主要以有机形式存在时。然而，由于AM真菌的外酶谱较差，它们不可能自行降解有机化合物，因此它们可能依赖于其他微生物来释放这些物质中所含的营养。在这里，我们回顾了有关AMF在植物N营养中的作用以及特别是从有机化合物中吸收N的当前知识，特别是涉及从有机化合物中释放和AM真菌利用N的微生物和过程。