Nodulation of Sinorhizobium meliloti originated from a mining soil alleviates Cd toxicity and increases Cd-phytoextraction in Medicago sativa L
Ghnaya, Tahar (Centre de Biotechnologies de la Technopole de Borj Cedria. Laboratoire des Plantes Extremophiles)
Mnasri, Majda (Centre de Biotechnologies de la Technopole de Borj Cedria. Laboratoire des Plantes Extremophiles)
Ghabriche, Rim (Centre de Biotechnologies de la Technopole de Borj Cedria. Laboratoire des Plantes Extremophiles)
Wali, Mariem (Centre de Biotechnologies de la Technopole de Borj Cedria. Laboratoire des Plantes Extremophiles)
Poschenrieder, Charlotte (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)
Lutts, Stanley (Université Catholique de Louvain. Institute - Agronomy)
Abdelly, Chedly (Centre de Biotechnologies de la Technopole de Borj Cedria. Laboratoire des Plantes Extremophiles)

Date:	2015
Abstract:	Besides their role in nitrogen supply to the host plants as a result of symbiotic N fixation, the association between legumes and Rhizobium could be useful for the rehabilitation of metal-contaminated soils by phytoextraction. A major limitation presents the metal-sensitivity of the bacterial strains. The aim of this work was to explore the usefulness of Sinorhizobium meliloti originated from a mining site for Cd phytoextraction by Medicago sativa. Inoculated and non-inoculated plants were cultivated for 60 d on soils containing 50 and/or 100 mg Cd kgˉ¹ soil. The inoculation hindered the occurrence of Cd- induced toxicity symptoms that appeared in the shoots of non-inoculated plants. This positive effect of S. meliloti colonization was accompanied by an increase in biomass production and improved nutrient acquisition comparatively to non-inoculated plants. Nodulation enhanced Cd absorption by the roots and Cd translocation to the shoots. The increase of plant biomass concomitantly with the increase of Cd shoot concentration in inoculated plants led to higher potential of Cd-phytoextraction in these plants. In the presence of 50 mg Cd kgˉ¹ in the soil, the amounts of Cd extracted in the shoots were 58 and 178 μg plantˉ¹ in non-inoculated and inoculated plants, respectively. This study demonstrates that this association M. sativa-S. meliloti may be an efficient biological system to extract Cd from contaminated soils.
Note:	Altres ajuts: MHESR/LR10CBBC02
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Phytoremediation ; Medicago sativa ; Sinorhizobium meliloti ; Cadmium ; Symbiotic association
Published in:	Frontiers in plant science, Vol. 6, Article 863 (October 2015) , p. 1-10, ISSN 1664-462X

DOI: 10.3389/fpls.2015.00863
PMID: 26528320

10 p, 2.2 MB

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