title: Isolation of plant-growth-promoting and metal-resistant cultivable bacteria from Arthrocnemum macrostachyum in the Odiel marshes with potential use in phytoremediation.
abstract: Arthrocnemum macrostachyum is a halophyte naturally growing in southwest coasts of Spain that can tolerate and accumulate heavy metals. A total of 48 bacteria (30 endophytes and 18 from the rhizosphere) were isolated from A. macrostachyum growing in the Odiel River marshes, an ecosystem with high levels of contamination. All the isolates exhibited plant-growth-promoting (PGP) properties and most of them were multiresistant to heavy metals. Although the presence of heavy metals reduced the capability of the isolates to exhibit PGP properties, several strains were able to maintain their properties or even enhance them in the presence of concrete metals. Two bacterial consortia with the best-performing endophytic or rhizospheric strains were selected for further experiments. Bacterial inoculation accelerated germination of A. macrostachyum seeds in both the absence and presence of heavy metals. These results suggest that inoculation of A. macrostachyum with the selected bacteria could ameliorate plant establishment and growth in contaminated marshes.
authors.affiliation: Departamento de Microbiología, Facultad de Farmacia, Universidad de Sevilla, C/Profesor García González 2, 41012 Sevilla, Spain.
authors.forename: S
authors.initials: S
authors.lastname: Navarro-Torre
authors.affiliation: Departamento de Biología Vegetal y Ecología, Facultad de Biología, Universidad de Sevilla, 41012 Sevilla, Spain.
authors.forename: E
authors.initials: E
authors.lastname: Mateos-Naranjo
authors.affiliation: Departamento de Microbiología, Facultad de Farmacia, Universidad de Sevilla, C/Profesor García González 2, 41012 Sevilla, Spain.
authors.forename: M A
authors.initials: MA
authors.lastname: Caviedes
authors.affiliation: Departamento de Microbiología, Facultad de Farmacia, Universidad de Sevilla, C/Profesor García González 2, 41012 Sevilla, Spain.
authors.forename: E
authors.initials: E
authors.lastname: Pajuelo
authors.affiliation: Departamento de Microbiología, Facultad de Farmacia, Universidad de Sevilla, C/Profesor García González 2, 41012 Sevilla, Spain. Electronic address: irodri@us.es.
authors.forename: I D
authors.initials: ID
authors.lastname: Rodríguez-Llorente
mesh_terms: D001419:Bacteria / Q000187:drug effects / Q000302:isolation & purification*; D001673:Biodegradation, Environmental; D019663:Chenopodiaceae / Q000382:microbiology*; D019216:Metals, Heavy; D055051:Salt-Tolerant Plants / Q000382:microbiology; D012989:Soil Pollutants; D014873:Water Pollutants; D053833:Wetlands
chemical_list: D019216:Metals, Heavy; D012989:Soil Pollutants; D014873:Water Pollutants
keywords: Arthrocnemum macrostachyum; Contaminated marshes; Heavy metals; Microbe-assisted phytoremediation; PGPB