Journal
BIOLOGY AND FERTILITY OF SOILS
Volume 45, Issue 4, Pages 385-394Publisher
SPRINGER
DOI: 10.1007/s00374-008-0346-7
Keywords
Salix; Ectomycorrhiza; Inoculation; Geopora; Plant growth promoting rhizobacteria
Categories
Funding
- Marie Curie Reintegration
- European Commission [MERG-CT-2004-006315]
- University of Torun (Poland) [523-B]
- Department of Microbiology, N. Copernicus University of Torun, Poland
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Re-vegetation of fly ash, the principal by-product of coal fired power stations, is hampered by its unfavourable chemical and physical properties for plant growth. In the present study, we evaluated the use of inoculation with a mycorrhiza-associated bacterial strain (Sphingomonas sp. 23L) to promote mycorrhiza formation and plant growth of three willow clones (Salix spp.) on fly ash from an over-burdened dump in a pot experiment. The high pH(H2O) (8.7) and low nitrogen content (N-t = 0.1 g kg(-1)) in combination with hydrophobicity of the particle surfaces caused low plant growth. Inoculation of the willows with Sphingomonas sp. 23L improved the nitrogen uptake by plants, increased plant growth and stimulated formation of ectomycorrhizae with an autochthonous Geopora sp. strain on all three willow clones. The ectomycorrhiza formed by the Geopora sp. was morphologically and anatomically described. The inoculation significantly increased the shoot growth of two Salix viminalis clones and the root growth of a S. viminalis x caprea hybrid clone. We conclude that inoculation with mycorrhiza promoting bacterial strains might be a suitable approach to support mycorrhiza formation with autochtonous site-adapted ectomycorrhizal fungi in fly ash and thereby to improve re-vegetation of fly ash landfills with willows.
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