title: Spartina densiflora demonstrates high tolerance to phenanthrene in soil and reduces it concentration.
abstract: The present study was conducted to investigate the tolerance of Spartina densiflora to phenanthrene, and to test its ability in phenanthrene dissipation. A glasshouse experiment was designed to investigate the effect of phenanthrene from 0 to 1000 mg kg(-1) on growth and photosynthetic apparatus of S. densiflora by measuring chlorophyll fluorescence parameters, gas exchange and photosynthetic pigments. We also performed chemical analysis of plant samples, and determined the concentration of phenanthrene remaining in soil. S. densiflora survived to concentrations as high as 1000 mg kg(-1) phenanthrene in soil; in fact, there was no significant difference in RGR among the treatments after 30 days. Otherwise, phenanthrene affected photosynthetic apparatus at 100 and 1000 mg kg(-1); thus, the lower ΦPSII could be explained by the declined photosynthetic pigment concentrations. Soil extraction indicated a more marked rate of phenanthrene disappearance in the soil in the presence of S. densiflora.
authors.affiliation: Departamento de Biología Vegetal y Ecología, Facultad de Biología, Universidad de Sevilla, Apartado 1095, Sevilla 41080, Spain. susana@us.es
authors.forename: Susana
authors.initials: S
authors.lastname: Redondo-Gómez
authors.forename: Luis
authors.initials: L
authors.lastname: Andrades-Moreno
authors.forename: Raquel
authors.initials: R
authors.lastname: Parra
authors.forename: Javier
authors.initials: J
authors.lastname: Valera-Burgos
authors.forename: Miguel
authors.initials: M
authors.lastname: Real
authors.forename: Enrique
authors.initials: E
authors.lastname: Mateos-Naranjo
authors.forename: Lucía
authors.initials: L
authors.lastname: Cox
authors.forename: Juan
authors.initials: J
authors.lastname: Cornejo
mesh_terms: D002734:Chlorophyll / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D005453:Fluorescence; D010616:Phenanthrenes / Q000633:toxicity*; D010788:Photosynthesis; D006109:Poaceae / Q000187:drug effects* / Q000254:growth & development / Q000502:physiology; D012989:Soil Pollutants / Q000737:chemistry / Q000633:toxicity*; D013312:Stress, Physiological / Q000187:drug effects
chemical_list: D010616:Phenanthrenes; D012989:Soil Pollutants; D002734:Chlorophyll; C031181:phenanthrene