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- Title
The combined effects of Pseudomonas fluorescens CECT 844 and the black truffle co-inoculation on Pinus nigra seedlings.
- Authors
Dominguez-Nuñez, José Alfonso; Medina, Marcelina; Berrocal-Lobo, Marta; Anriquez, Analía; Albanesi, Ada
- Abstract
The inoculation with mycorrhizal fungi and rhizobacteria has been demonstrated to improve the morphology and physiology of seedlings used in the reforestation of Mediterranean areas, as well as to favor the reintroduction of mycorrhizal fungi into such environments. Pinus nigra subsp. salzmannii, currently used in the reforestation of Mediterranean regions, may host an ectomycorrhizal symbiosis with the Ascomycetes fungus Tuber melanosporum Vitt. (black truffle). Previous investigations demonstrated that the inoculation of Pinus halepensis seedlings with the rhizobacterium Pseudomonas fluorescens CECT 844 and T. melanosporum improved plant growth and N absorption, and doubled the rate of mycorrhization of T. melanosporum. In the present work, we studied the morphophysiological response of P. nigra seedlings grown under well-watered conditions in a nursery to the combined inoculation with T. melanosporum and/or P. fluorescens CECT 844. Five months after inoculation, growth parameters (seedling height, basal diameter, and shoot and root dry weight), mycorrhizal colonization, water parameters (osmotic potential at both full and zero turgor and modulus of elasticity), and total contents and concentrations of N, P, and K were measured in the roots and shoots of seedlings, and the root growth potentials was estimated. The addition of P. fluorescens CECT 844 did not significantly improve the mycorrhizal colonization by T. melanosporum on P. nigra seedling roots. Additionally, P. fluorescens inoculation caused few significant improvements in growth and water parameters of seedlings. Moreover, apparently opposing effects on P uptake were observed between the two inoculations. The use of P. fluorescens CECT 844 as a Mycorrhizal Helper Bacterium (MHB) through different mechanisms and in different environmental conditions is discussed.
- Subjects
PSEUDOMONAS fluorescens; AUSTRIAN pine; SEEDLINGS; MYCORRHIZAL fungi; RHIZOBACTERIA; PLANT morphology; PLANT physiology
- Publication
iForest - Biogeosciences & Forestry, 2015, Vol 8, Issue 5, pe1
- ISSN
1971-7458
- Publication type
Article
- DOI
10.3832/ifor1334-007