How deep can ectomycorrhizas go? A case study on Pisolithus down to 4 meters in a Brazilian eucalypt plantation

Robin Agnès, Pradier Céline, Sanguin Hervé, Mahé Frédéric, Lambais George Rodrigues, de Araujo Pereira Arthur Prudêncio, Germon Amandine, Cintra Santana Maiele, Tisseyre Pierre, Pablo Anne-laure, Heuillard Pauline, Sauvadet Marie, Bouillet Jean-Pierre, Dini Andreote Fernando, Plassard Claude, De Moraes Gonçalves Jose Leonardo, Bran Nogueira Cardoso Elke Jurandy, Laclau Jean-Paul, Hinsinger Philippe, Jourdan Christophe. 2019. How deep can ectomycorrhizas go? A case study on Pisolithus down to 4 meters in a Brazilian eucalypt plantation. Mycorrhiza, 29 (6) : 637-648.

https://doi.org/10.1007/s00572-019-00917-y

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

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Url - autres données associées : https://cran.r-project.org/web/packages/tidyverse/index.html

Quartile : Q2, Sujet : MYCOLOGY

Résumé : Despite the strong ecological importance of ectomycorrhizal (ECM) fungi, their vertical distribution remains poorly understood. To our knowledge, ECM structures associated with trees have never been reported in depths below 2 meters. In this study, fine roots and ECM root tips were sampled down to 4-m depth during the digging of two independent pits differing by their water availability. A meta-barcoding approach based on Illumina sequencing of internal transcribed spacers (ITS1 and ITS2) was carried out on DNA extracted from root samples (fine roots and ECM root tips separately). ECM fungi dominated the root-associated fungal community, with more than 90% of sequences assigned to the genus Pisolithus. The morphological and barcoding results demonstrated, for the first time, the presence of ECM symbiosis down to 4-m. The molecular diversity of Pisolithus spp. was strongly dependent on depth, with soil pH and soil water content as primary drivers of the Pisolithus spp. structure. Altogether, our results highlight the importance to consider the ECM symbiosis in deep soil layers to improve our understanding of fine roots functioning in tropical soils.

Mots-clés Agrovoc : plantation forestière, Eucalyptus grandis, ectomycorhize, Pisolithus, enracinement, profondeur

Mots-clés géographiques Agrovoc : Brésil

Mots-clés libres : Deep fine roots, ECM root tips, Eucalyptus grandis, Next-generation sequencing, Diversity, Tropical forest plantations

Classification Agris : K10 - Production forestière
P34 - Biologie du sol
F62 - Physiologie végétale - Croissance et développement

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

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