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Authors Nonnoi, F; Chinnaswamy, A; de la Torre, VSG; de la Pena, TC; Lucas, MM; Pueyo, JJ
Author Full Name Nonnoi, Francesca; Chinnaswamy, Appunu; Garcia de la Torre, Vanesa S.; Coba de la Pena, Teodoro; Mercedes Lucas, M.; Pueyo, Jose J.
Title Metal tolerance of rhizobial strains isolated from nodules of herbaceous legumes (Medicago spp. and Trifolium spp.) growing in mercury-contaminated soils
Source APPLIED SOIL ECOLOGY
Language English
Document Type Article
Author Keywords Rhizobium; Legumes; Symbiosis; Mercury; Metal tolerance; Bioremediation
Keywords Plus ALMADEN MINING DISTRICT; GENETIC DIVERSITY; SINORHIZOBIUM-MELILOTI; HEAVY-METALS; LEGUMINOUS PLANT; GROWTH PROMOTION; POPULATIONS; PHOSPHATE; BACTERIA; ACCUMULATION
Abstract Mercury contamination of soils constitutes a serious environmental problem worldwide. Rhizobium-legume symbioses represent an interesting potential tool in soil bioremediation. Besides their nitrogen-fixing capacity, they have the advantage of integrating microorganisms that may influence metal bioavailability and legume plants that may act as phytoextractors or phytostabilizers. Herbaceous forage legumes present additional advantages in that they grow rapidly, producing a high biomass, and they are easy to harvest. Analysing legume endosymbiont tolerance is essential to successfully manage these symbiotic associations in metal-polluted areas, although little information is as yet available regarding Hg-tolerant rhizobia. The aim of this study was to isolate and characterize rhizobia from nodules of Medicago spp. and Trifolium spp. plants that grow in Hg-contaminated soils. Fifty-nine bacterial strains were genetically characterized and identified as belonging to the Ensifer medicae and Rhizobium leguminosarum by. mfolii species. Rhizobial strains highly tolerant to Hg and strains displaying multiple metal tolerances were identified. The bacteria showed important phenotypic diversity in terms of salt and pH tolerance, phosphate solubilization and tolerance to different heavy metals. Significant correlations were found between metal tolerance responses. The influences of the site of origin, the host plant and bacterial species on metal tolerance were analysed. (c) 2012 Elsevier B.V. All rights reserved.
Author Address [Nonnoi, Francesca; Chinnaswamy, Appunu; Garcia de la Torre, Vanesa S.; Coba de la Pena, Teodoro; Mercedes Lucas, M.; Pueyo, Jose J.] CSIC, Inst Ciencias Agr, E-28006 Madrid, Spain
Reprint Address Pueyo, JJ (corresponding author), CSIC, Inst Ciencias Agr, Serrano 115 Bis, E-28006 Madrid, Spain.
E-mail Address jj.pueyo@csic.es
ResearcherID Number Pueyo, Jose J./D-8993-2016; de la Torre, Vanesa S Garcia/L-4046-2016; Lucas, M Mercedes/H-4529-2016
ORCID Number Pueyo, Jose J./0000-0003-0337-4078; de la Torre, Vanesa S Garcia/0000-0002-2972-6927; Lucas, M Mercedes/0000-0002-3252-0145
Funding Agency and Grant Number Spanish Ministry of Science and InnovationSpanish Government; Junta de Comunidades de Castilla-La ManchaJunta de Comunidades de Castilla-La Mancha; Fundacion Ramon Areces; Comunidad de MadridComunidad de Madrid; JAE PreDOC Fellowship from Consejo Superior de Investigaciones Cientificas; Spanish Ministry of EducationSpanish Government; FPU fellowship from the Spanish Ministry of EducationGerman Research Foundation (DFG)
Funding Text The authors thank L. Barrios for her help with statistical analyses, and C. Gutierrez and O. Cedenilla for their help with soil analysis. This work was supported by the Spanish Ministry of Science and Innovation, the Junta de Comunidades de Castilla-La Mancha, and the Fundacion Ramon Areces (grants to J.J.P.) and the Comunidad de Madrid (grants to J.J.P. and M.M.L., and a contract to T.C.P.). F.N. was the recipient of a JAE PreDOC Fellowship from Consejo Superior de Investigaciones Cientificas, A.C. held a contract from the Spanish Ministry of Education, V.S.G.T. was the recipient of an FPU fellowship from the Spanish Ministry of Education.
Times Cited 33
Total Times Cited Count (WoS, BCI, and CSCD) 38
Publisher ELSEVIER
Publisher City AMSTERDAM
Publisher Address RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS
ISSN 0929-1393
29-Character Source Abbreviation APPL SOIL ECOL
ISO Source Abbreviation Appl. Soil Ecol.
Publication Date OCT
Year Published 2012
Volume 61
Special Issue SI
Beginning Page 49
Ending Page 59
Digital Object Identifier (DOI) 10.1016/j.apsoil.2012.06.004
Page Count 11
Web of Science Category Soil Science
Subject Category Agriculture
Document Delivery Number 020DT
Unique Article Identifier WOS:000309789700007
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