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Arbuscular mycorrhizal fungi-mediated nitrogen transfer from vineyard cover crops to grapevines

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Abstract

Cover crops are often planted in between vineyard rows to reduce soil erosion, increase soil fertility, and improve soil structure. Roots of both grapevines and cover crops form mutualistic symbioses with arbuscular mycorrhizal (AM) fungi, and may be interconnected by AM hyphae. To study nutrient transfer from cover crops to grapevines through AM fungal links, we grew grapevines and cover crops in specially designed containers in the greenhouse that restricted their root systems to separate compartments, but allowed AM fungi to colonize both root systems. Leaves of two cover crops, a grass (Bromus hordeaceus) and a legume (Medicago polymorpha), were labeled with 99 atom% 15N solution for 24 h. Grapevine leaves were analyzed for 15N content 2, 5, and 10 days after labeling. Our results showed evidence of AM fungi-mediated 15N transfer from cover crops to grapevines 5 and 10 days after labeling. N transfer was significantly greater from the grass to the grapevine than from the legume to the grapevine. Possible reasons for the differences between the two cover crops include lower 15N enrichment in legume roots, higher biomass of grass roots, and/or differences in AM fungal community composition. Further studies are needed to investigate N transfer from grapevines to cover crops and to determine net N transfer between the two crops throughout their growing seasons, in order to understand the significance of AM fungi-mediated interplant nutrient transfers in the field.

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Acknowledgements

We thank Jeremy Warren and Sharon Schnabel for field and laboratory assistance. Special thanks to Dr Xinhua He and Lissa Veilleux at the University of California, Davis for their valuable comments on this manuscript. This research was supported by the USDA-ARS.

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Correspondence to Kendra Baumgartner.

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Cheng, X., Baumgartner, K. Arbuscular mycorrhizal fungi-mediated nitrogen transfer from vineyard cover crops to grapevines. Biol Fertil Soils 40, 406–412 (2004). https://doi.org/10.1007/s00374-004-0797-4

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  • DOI: https://doi.org/10.1007/s00374-004-0797-4

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