Species - specific trade - offs between regrowth and mycorrhizas in the face of defoliation and phosphorus addition

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Arbuscular mycorrhizal fungi (AMF) enhance nutrient provision in exchange for carbon. However, a shift from nutrient to carbon limitation, induced by repeated or intense defoliation, can represent a trade-off between plant regrowth and the maintenance of mycorrhiza. The combined effects of AMF, phos...

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Detalles Bibliográficos
Otros Autores: Cavagnaro, Fernando Pablo, Oyarzabal, Mariano, Oesterheld, Martín, Grimoldi, Agustín Alberto
Formato: Artículo
Lenguaje:Inglés
Materias:
ARBUSCULAR MYCORRHIZAL FUNGI (AMF)
GROPYRON ELONGATUM
(C3) GRASS
BRACHIARIA BRIZANTHA
(C4) GRASS
PHOSPHORUS
DEFOLIATION
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2021cavagnaro.pdf
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Biblioteca Central (FAUBA) de Universidad de Buenos Aires
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Sumario:Arbuscular mycorrhizal fungi (AMF) enhance nutrient provision in exchange for carbon. However, a shift from nutrient to carbon limitation, induced by repeated or intense defoliation, can represent a trade-off between plant regrowth and the maintenance of mycorrhiza. The combined effects of AMF, phosphorus and defoliation on growth of Agropyron elongatum (C3 grass, low mycorrhizal responsiveness) and Brachiaria brizantha (C4 grass, high mycorrhizal responsiveness) were explored. Each species was subjected to a manipulative experiment with AMF inoculation (non-inoculated, inoculated), soluble P supply (low, high) and defoliation (non-defoliated, 60% defoliated). In A. elongatum, at low P supply, mycorrhizal plants showed increased growth rates following defoliation without substantial changes in AMF colonization. At high P supply instead, we found a clear trade-off between regrowth and the maintenance of mycorrhiza evidenced by growth depression (biomass and tillers) and lower AMF activity (reduction of arbuscules). In contrast, in B. brizantha, defoliation effects on plant regrowth were independent from AMF at any P supply (no trade-off). This indicates that cost-benefit relationship in defoliated plants is highly context-dependent and may vary with mycorrhizal responsiveness of species. This variation of responses can play a decisive role on plant recovery in pastures and natural grasslands subjected to herbivory.
ISSN:1754-5048

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