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  • Title: Nitrogen and carbon/nitrogen dynamics in arbuscular mycorrhiza: the great unknown.
    Author: Corrêa A, Cruz C, Ferrol N.
    Journal: Mycorrhiza; 2015 Oct; 25(7):499-515. PubMed ID: 25681010.
    Abstract:
    Many studies have established that arbuscular mycorrhizal fungi transfer N to the host plant. However, the role and importance of arbuscular mycorrhiza (AM) in plant N nutrition is still uncertain, as are the C/N interactions within the symbiosis. Published reports provide differing, and often contradictory, results that are difficult to combine in a coherent framework. This review explores questions such as: What makes the difference between a positive and a negative effect of AM on plant N nutrition? Is the mycorrhizal N response (MNR) correlated to the mycorrhizal growth response (MGR), and how or under which conditions? Is the MNR effect on plant growth C mediated? Is plant C investment on fungal growth related to N needs or N benefit? How is the N for C trade between symbionts regulated? The patternless nature of current knowledge is made evident, and possible reasons for this are discussed.
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