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Soil fungi promote nitrogen transfer among plants involved in long-lasting facilitative interactions

Authors :
Lugui Sortibrán
Alfonso Valiente-Banuet
José Ignacio Querejeta
Miguel Verdú
Alicia Montesinos-Navarro
Ministerio de Economía y Competitividad (España)
Universidad Nacional Autónoma de México
Verdú, Miguel [0000-0002-9778-7692]
Querejeta Mercader, José Ignacio [0000-0002-9547-0974]
Montesinos-Navarro, Alicia [0000-0003-4656-0321]
Verdú, Miguel
Querejeta Mercader, José Ignacio
Montesinos-Navarro, Alicia
Source :
Digital.CSIC. Repositorio Institucional del CSIC, instname
Publication Year :
2016
Publisher :
Elsevier BV, 2016.

Abstract

Plant facilitative interactions may persist in the long term when there are benefits for the interacting adult plants. Whereas persistent benefits for adult nurse plants have been demonstrated, the long-term benefits derived by adult facilitated plants have been largely unexplored. We hypothesize that common mycorrhizal networks (CMNs) can provide a pathway through which nurse species can benefit adult facilitated plants persistently. We specifically test whether nitrogen can be transferred from nurse plants to their adult facilitated plants, and evaluate to which extent CMNs mediate the transfer. We selected 32 adult individuals of 6 facilitated plant species growing in 15 vegetation patches in a Mexican desert. We treated some vegetation patches with fungicide and left others as controls. Then, we labeled the nurse plants with 15N-enriched urea and quantified the amount of 15N transferred to their adult facilitated plants. We expected a greater 15N transfer to facilitated individuals growing in vegetation patches with intact CMNs than in those treated with fungicide. Facilitated plants growing in patches with intact CMNs showed on average a greater increment in their foliar δ15N (i.e. difference between post-labeling–pre-labeling) than those in patches treated with fungicide. Our results provide evidence that CMNs enhance nitrogen transfer among adult plants, thus providing a potential mechanism contributing to the long-term persistence of plant facilitative associations.<br />AMN was supported by a postdoctoral contract from the Ministerio de Economía y Competitividad (FPDI-2013-16266) and an Early Career Project Grant from the BES (3975-4849). Funding was also provided by PAPIIT-DGAPA-UNAM (IN-213414-3).

Details

ISSN :
14338319
Volume :
18
Database :
OpenAIRE
Journal :
Perspectives in Plant Ecology, Evolution and Systematics
Accession number :
edsair.doi.dedup.....50746a2fbe2a74b0fc5d635a75860937
Full Text :
https://doi.org/10.1016/j.ppees.2016.01.004