Abstract
The effect of arbuscular mycorrhizal fungi (AMF) on plant growth was examined in two wild plant species belonging to contrasting functional types: an annual forb (Bidens pilosa, Asteraceae) and a deciduous shrub (Acacia caven, Fabaceae) at three contrasting plant densities (one, two, and three individuals per pot). AMF had a slightly negative effect on B. pilosa when the species grew in isolation while they positively affected A. caven. Positive effects of AMF on shoot mass of A. caven decreased at higher plant densities, while shoot mass of individuals of B. pilosa showed less marked differences between plant densities. When considering total biomass per pot, AMF positively affected A. caven growth while negatively affecting B. pilosa, at all three plant densities. Root/shoot ratio per pot was negatively affected by AMF but not plant density in both species. These findings highlight the importance of including plants belonging to different life forms and/or traits in research regarding the interaction between AMF and intraspecific plant competition.
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Acknowledgements
Paula Tecco made useful comments on a previous version of this manuscript. Comments and suggestions by Dr. Gianinazzi-Pearson and two anonymous reviewers helped to improve the quality of this manuscript. This study was supported by FONCyT, CONICET, Universidad Nacional de Córdoba, and Idea Wild Foundation. C.U. is researcher of the National Council of Argentina (CONICET).
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Pérez, M., Urcelay, C. Differential growth response to arbuscular mycorrhizal fungi and plant density in two wild plants belonging to contrasting functional types. Mycorrhiza 19, 517–523 (2009). https://doi.org/10.1007/s00572-009-0254-1
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DOI: https://doi.org/10.1007/s00572-009-0254-1