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http://hdl.handle.net/10400.14/19886
Título: | Rhizobacterial communities associated with the flora of three serpentine outcrops of the Iberian Peninsula |
Autor: | Álvarez-López, Vanessa Prieto-Fernández, Ángeles Becerra-Castro, Cristina Monterroso, Carmela Kidd, Petra S. |
Palavras-chave: | Alyssum serpyllifolium Hyperaccumulators Nickel Plant-associated bacteria PGP traits Bacterial diversity Phytoextraction |
Data: | 2016 |
Editora: | Springer |
Citação: | ÁLVAREZ-LÓPEZ, Vanessa; PRIETO-FERNÁNDEZ, Ángeles; BECERRA-CASTRO, Cristina; MONTERROSO, Carmela; KIDD, Petra S. - Rhizobacterial communities associated with the flora of three serpentine outcrops of the Iberian Peninsula. Plant and Soil. ISSN 0032-079X (2016), vol. 403, nº1-2, p.233-252. DOI 10.1007/s11104-015-2632-0 |
Resumo: | Aim Plant -associated bacteria can improve phytoextraction by increasing plant growth and/or metal uptake. This study aimed to characterise the culturable rhizobacterial community associated with two Nihyperaccumulators and to obtain a collection of isolates for application in Ni phytomining. Methods Non-vegetated and rhizosphere soil samples were collected from the Ni-hyperaccumulator Alyssum serpyllifolium ssp. lusitanicum (three populations) and Alyssum serpyllifolium ssp. malacitanum (one population), as well as from non-hyperaccumulating plants (Dactylis glomerata, Santolina semidentata and Alyssum serpyllifolium ssp. serpyllifolium). Rhizobacteria were isolated and characterised genotypically (BOX-PCR, 16S rDNA sequencing) and phenotypically (Ni tolerance, plant growth promoting (PGP) traits, biosurfactant production). Results Hyperaccumulating Alyssum subspecies hosted higher densities of bacteria compared to either nonhyperaccumulators or non-vegetated soil. In some cases hyperaccumulators showed selective enrichment of Nitolerant bacteria. Most bacterial strains belonged to the Actinobacteria phylum and presented Ni resistance. Phosphorus-solubilisers were mostly associated with the hyperaccumulators, siderophore-producers with D. glomerata, and IAA-producers with both these species. Conclusion Taxonomic diversity and phenotypic characteristics were soil-, plant species- and plant population- specific. Moreover, differences were observed between the two Ni-hyperaccumulating subspecies and amongst plant populations. Several strains presented PGP characteristics which could be useful when selecting microorganisms for bioaugmentation trials. |
Peer review: | yes |
URI: | http://hdl.handle.net/10400.14/19886 |
DOI: | 10.1007/s11104-015-2632-0 |
Aparece nas colecções: | CBQF - Artigos / Articles |
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26853478.pdf | 1,61 MB | Adobe PDF | Ver/Abrir Acesso Restrito. Solicitar cópia ao autor! |
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