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Can NPK fertilizers enhance seedling growth and mycorrhizal status of Tuber melanosporum-inoculated Quercus ilex seedlings?

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Abstract

Although successful cultivation of the black truffle (Tuber melanosporum) has inspired the establishment of widespread truffle orchards in agricultural lands throughout the world, there are many unknowns involved in proper management of orchards during the 6–10 years prior to truffle production, and there are conflicting results reported for fertilizer treatments. Here, we systematically evaluate the combined effects of nitrogen, phosphorous, and potassium with different doses of each element, applied to either foliage or roots, on plant growth parameters and the mycorrhizal status of outplanted 3-year-old seedlings in five experimental Quercus ilex–T. melanosporum orchards. Fertilization did not significantly improve seedling aboveground growth, but the plants treated with the fertilizer 12-7-7 applied to the roots (HNr) displayed longer field-developed roots. Only the fertilizer with the highest dose of K (10-6-28) applied to the foliage (HKf) increased the probability of fine root tip colonization by T. melanosporum in field-developed roots. However, the plants treated with the same fertilizer applied to the soil (HKr) presented the highest probability for colonization by other competing mycorrhizal soil fungi. Potassium seems to have an important role in mycorrhizal development in these soils. Apart from T. melanosporum, we found 14 ectomycorrhizal morphotypes, from which seven were identified to species level, three to genus, two to family, and two remained unidentified by their morphological characteristics and DNA analyses.

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Acknowledgments

This work was supported in part by the Departament de Medi Ambient i Habitatge of the Generalitat de Catalunya, by scholarship 2002FI-00711 to L.M. Suz from the Departament d'Innovació, Universitats i Empresa of the Generalitat de Catalunya, and by grant FMI-REN2002-04068-CO2-01 from Ministerio de Ciencia y Tecnología and grant CTP2000-3 from the Comunidad de Trabajo de los Pirineos. We are indebted to the orchards owners for the open access to their truffle orchards, to D. Oliach for field and laboratory assistance, to Dr. J. Oliva for statistical support, and to Dr. CS Bledsoe for helpful suggestions and English support. We also thank the anonymous reviewers for their suggestions in improving the manuscript.

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Author notes

  1. Laura M. Suz

    Present address: Departamento de Biología Vegetal (Botánica), Facultad de Biología, Universidad de Murcia, Campus de Espinardo, 30100, Murcia, Spain

Authors and Affiliations

  1. Àrea Defensa del Bosc, Centre Tecnològic Forestal de Catalunya, Crta. St. Llorens, km 2, 25280, Solsona, Lleida, Spain

    Laura M. Suz, Christine R. Fischer, José A. Bonet & Carlos Colinas

  2. Departamento de Micología, Real Jardín Botánico, CSIC, Plaza de Murillo 2, 28014, Madrid, Spain

    María P. Martín

  3. Departamento de Producción Vegetal y Ciencia Forestal, Universitad de Lleida, 25198, Lleida, Spain

    José A. Bonet & Carlos Colinas

Authors
  1. Laura M. Suz
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  2. María P. Martín
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  3. Christine R. Fischer
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  4. José A. Bonet
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Corresponding author

Correspondence to Laura M. Suz.

Electronic supplementary material

Below is the link to the electronic supplementary material.

Online Resource 1

Location of the five sites in Spain. A Scheme of one site (block) composed of nine experimental units (6 × 6 m2) where each of the nine treatments was randomly applied. B Scheme of four experimental units formed by ten Q. ilex seedlings (represented by x) separated by a row of noninoculated seedlings (JPEG 226 kb)

Online Resource 2

Anatomical details of the mycorrhiza AD type under the light microscope. a Cystidia emerging from the mantle; bar = 30 µm. b Pseudoparenchymatous mantle with polygonal cells; bar = 10 µm. c Cystidia branched in 90° angles; bar = 10 µm (JPEG 1449 kb)

Online Resource 3

a Ring-like arrangement of hyphae in the mantle of the morphotype ECM3, Melanogaster broomeianus. b Rhizomorph type F (Agerer 1987–2001) of the morphotype ECM5, Astraeus hygrometricus; bar = 20 µm (JPEG 901 kb)

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Suz, L.M., Martín, M.P., Fischer, C.R. et al. Can NPK fertilizers enhance seedling growth and mycorrhizal status of Tuber melanosporum-inoculated Quercus ilex seedlings?. Mycorrhiza 20, 349–360 (2010). https://doi.org/10.1007/s00572-009-0289-3

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