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The combined effects of Pseudomonas fluorescens and Tuber melanosporum on the quality of Pinus halepensis seedlings

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Abstract

The ecological, economic and social values of the ectomycorrhizal fungi of the black truffle found in the rural Mediterranean are well known. The inoculation of Pinus halepensis seedlings with mycorrhizal fungi and rhizobacteria can improve the morphology and physiology of the seedlings and benefit the regeneration of arid regions and the reintroduction of inocula of mycorrhizal fungi into these areas. Some rhizobacteria can improve the establishment and functioning of ectomycorrhizal symbiosis. In this study, seedlings of P. halepensis were inoculated with the mycorrhizal fungus Tuber melanosporum and the rhizobacteria Pseudomonas fluorescens CECT 844 under non-limiting greenhouse conditions. Five months after inoculation, we analysed the growth, water parameters (osmotic potential at saturation, osmotic potential at turgor loss and modulus of elasticity), concentrations of mycorrhizal colonies, nutrient concentration and nutrient contents (N, P, K, Ca, Mg and Fe) in roots and aerial parts of the seedlings. Subsequently, tests were performed to estimate the root growth potentials. None of the treatments changed the water parameters or growth potentials of the roots. The inoculations improved the growth and nutrient uptake of the seedlings, although the combination of P. fluorescens CECT 844 and T. melanosporum did not generally lead to a significant improvement over the positive effects of a simple inoculation of T. melanosporum; however, the addition of P. fluorescens CECT 844 did double the rate of the mycorrhization of T. melanosporum. These results may be promising for enhancing the cultivation of truffles.

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Acknowledgments

This work has been funded as part of the project A/019592/08 “Use of inoculants for sustainable agricultural and forestry production systems” of the PCI-AECID (programme of cooperation between universities and scientific research between Spain and Latin America. Spanish International Cooperation Agency for Development)

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Authors and Affiliations

  1. E.T.S.I Mountains and E.U.I.T Forestry, Polytechnic University of Madrid, Av/Ciudad Universitaria s/n., 28040, Madrid, Spain

    J. A. Dominguez & A. Martin

  2. Faculty of Agronomy and Agroindustries, National University of Santiago del Estero, Av/Belgrano (S) 1912, 4200, Santiago del Estero, Argentina

    A. Anriquez & A. Albanesi

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  1. J. A. Dominguez
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  2. A. Martin
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  3. A. Anriquez
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  4. A. Albanesi
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Correspondence to J. A. Dominguez.

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Dominguez, J.A., Martin, A., Anriquez, A. et al. The combined effects of Pseudomonas fluorescens and Tuber melanosporum on the quality of Pinus halepensis seedlings. Mycorrhiza 22, 429–436 (2012). https://doi.org/10.1007/s00572-011-0420-0

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