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Püschel D, Janoušková M, Hujslová M, et al. Plant-fungus competition for nitrogen erases mycorrhizal growth benefits of Andropogon gerardii under limited nitrogen supply. Ecol Evol. 2016;6(13):4332-46doi: 10.1002/ece3.2207.
Püschel, D., Janoušková, M., Hujslová, M., Slavíková, R., Gryndlerová, H., & Jansa, J. (2016). Plant-fungus competition for nitrogen erases mycorrhizal growth benefits of Andropogon gerardii under limited nitrogen supply. Ecology and evolution, 6(13), 4332-46. https://doi.org/10.1002/ece3.2207
Püschel, David, et al. "Plant-fungus competition for nitrogen erases mycorrhizal growth benefits of Andropogon gerardii under limited nitrogen supply." Ecology and evolution vol. 6,13 (2016): 4332-46. doi: https://doi.org/10.1002/ece3.2207
Püschel D, Janoušková M, Hujslová M, Slavíková R, Gryndlerová H, Jansa J. Plant-fungus competition for nitrogen erases mycorrhizal growth benefits of Andropogon gerardii under limited nitrogen supply. Ecol Evol. 2016 May 30;6(13):4332-46. doi: 10.1002/ece3.2207. eCollection 2016 Jul. PMID: 27386079; PMCID: PMC4930984.
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Ecol Evol. 2016 May 30;6(13):4332-46. doi: 10.1002/ece3.2207. eCollection 2016 Jul.

Plant-fungus competition for nitrogen erases mycorrhizal growth benefits of Andropogon gerardii under limited nitrogen supply.

Ecology and evolution

David Püschel, Martina Janoušková, Martina Hujslová, Renata Slavíková, Hana Gryndlerová, Jan Jansa

Affiliations

  1. Laboratory of Fungal Biology Institute of Microbiology Czech Academy of Sciences Prague Czech Republic; Department of Mycorrhizal Symbioses Institute of Botany Czech Academy of Sciences Pr?honice Czech Republic.
  2. Laboratory of Fungal Biology Institute of Microbiology Czech Academy of Sciences Prague Czech Republic.

PMID: 27386079 PMCID: PMC4930984 DOI: 10.1002/ece3.2207

Abstract

Considered to play an important role in plant mineral nutrition, arbuscular mycorrhizal (AM) symbiosis is a common relationship between the roots of a great majority of plant species and glomeromycotan fungi. Its effects on the plant host are highly context dependent, with the greatest benefits often observed in phosphorus (P)-limited environments. Mycorrhizal contribution to plant nitrogen (N) nutrition is probably less important under most conditions. Moreover, inasmuch as both plant and fungi require substantial quantities of N for their growth, competition for N could potentially reduce net mycorrhizal benefits to the plant under conditions of limited N supply. Further compounded by increased belowground carbon (C) drain, the mycorrhizal costs could outweigh the benefits under severe N limitation. Using a field AM fungal community or a laboratory culture of Rhizophagus irregularis as mycorrhizal inoculants, we tested the contribution of mycorrhizal symbiosis to the growth, C allocation, and mineral nutrition of Andropogon gerardii growing in a nutrient-poor substrate under variable N and P supplies. The plants unambiguously competed with the fungi for N when its supply was low, resulting in no or negative mycorrhizal growth and N-uptake responses under such conditions. The field AM fungal communities manifested their potential to improve plant P nutrition only upon N fertilization, whereas the R. irregularis slightly yet significantly increased P uptake of its plant host (but not the host's growth) even without N supply. Coincident with increasing levels of root colonization by the AM fungal structures, both inoculants invariably increased nutritional and growth benefits to the host with increasing N supply. This, in turn, resulted in relieving plant P deficiency, which was persistent in non-mycorrhizal plants across the entire range of nutrient supplies.

Keywords: Arbuscular mycorrhizal fungi; belowground carbon drain; inoculation; mycorrhizal benefits and costs; nutrient uptake response; shoot nitrogen‐to‐phosphorus ratio

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