Forage biomass yield and arbuscular mycorrhizal symbiosis in a legume and C3 and C4 grasses under increasing soil phosphorus availability
Tomás Chippano A , Ileana García
A C , Noelia Cofré B and Rodolfo Mendoza A
+ Author Affiliations
- Author Affiliations
A Museo Argentino de Ciencias Naturales ‘Bernardino Rivadavia’ (MACN), CONICET,Avenida Ángel Gallardo 470, Ciudad de Buenos Aires, C1405DJR, Buenos Aires, Argentina.
B Instituto Multidisciplinario de Biología Vegetal (IMBIV), CONICET, UNC, CC 495, 5000, Córdoba, Argentina.
C Corresponding author. Email: igarcia@macn.gov.ar
Crop and Pasture Science 71(10) 907-915 https://doi.org/10.1071/CP20030
Submitted: 4 February 2020 Accepted: 20 October 2020 Published: 19 November 2020
Abstract
Phosphorus (P) is the main limiting factor for forage production in grasslands. It is important to determine levels of available P in soil that optimise production with minimum impact on arbuscular mycorrhizal (AM) symbiosis. We investigated the effects of increasing P availability on biomass production, root morphology, AM symbiosis and P acquisition of a forage legume (Lotus tenuis), a C3 grass (Schedonorus arundinaceus) and a C4 grass (Panicum coloratum) growing on a P-deficient soil in pots with P applied at rates of 0–160 mg kg–1 dry soil. The three forage species responded strongly to addition of P, with 90% of maximum shoot growth reached at available P levels of 24.3 mg kg–1 for L. tenuis, 14.4 mg kg–1 for P. coloratum and 11.2 mg kg–1 for S. arundinaceus. Lotus tenuis and P. coloratum produced higher yields of shoot biomass than S. arundinaceus. Root dry weight was higher in the legume than in the grasses, with the root-mass fraction being lowest in P. coloratum. AM colonisation was higher in L. tenuis roots than in grass roots, and decreased with increased soil P availability, especially in grasses. Low to moderate additions of P did not affect, and could even improve, AM colonisation in L. tenuis roots. For L. tenuis, it is possible to increase forage yield while maintaining high values of AM colonisation at 10–20 mg kg–1 of available P, but for grasses, especially S. arundinaceus, it is difficult to achieve both objectives. The presence of L. tenuis in grasslands or pastures may contribute to maintaining the native AM inoculum under a wide range of soil P availability in regions such as the Salado River basin of Argentina.
Keywords: arbuscular mycorrhizae, forage species, narrow-leaf birds-foot trefoil, P-deficient soil, phosphorus uptake, tall fescue.
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