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• W2155155371 abstract "• Nitrogen isotope (δ 15 N) patterns in plants may provide insight into plant N dynamics. Here, two analytical models of N-isotope cycling in plants and mycorrhizal fungi were tested, as dominant plants in many forest ecosystems obtain most of their N through intereactions with mycorrhizal fungi. • Fungi were treated either as a single well-mixed N pool, or as two N pools (one available, plus one not available, for transfer to the host). Models were compared against complete biomass and 15 N budgets from culture studies of nonmycorrhizal and ectomycorrhizal Pinus sylvestris (colonized with Suillus luteus or Thelephora terrestris ) grown exponentially at low and high N supply. • Fungal biomass and N increased at low N relative to high N supply, whereas needle δ 15 N decreased. Needle δ 15 N correlated strongly and negatively with biomass of extraradical hyphae. Our data and models suggest that low plant δ 15 N values in low productivity and N-limited environments result partly from high retention of 15 N-enriched N by mycorrhizal fungi; this retention was driven by increased C flux to fungi under N-limited conditions. The two-pool model of fungal N accounted for greater variability in plant δ 15 N than the one-pool model. • Plant δ 15 N patterns may indicate relative allocation of fixed C from plants to mycorrhizal fungi under some conditions. Studies are needed on whether patterns observed in culture can be applied to interpret field measurements of δ 15N." @default.
• W2155155371 created "2016-06-24" @default.
• W2155155371 creator A5011554216 @default.
• W2155155371 creator A5057270429 @default.
• W2155155371 date "2002-12-19" @default.
• W2155155371 modified "2023-09-30" @default.
• W2155155371 title "Nitrogen availability and colonization by mycorrhizal fungi correlate with nitrogen isotope patterns in plants" @default.
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• W2155155371 doi "https://doi.org/10.1046/j.1469-8137.2003.00657.x" @default.
• W2155155371 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33873704" @default.
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