title: Effects of phenoxy acetic herbicides on growth, photosynthesis, and nitrogenase activity in cyanobacteria from rice fields.
abstract: The effects of the phenoxy acetic herbicides 2,4-dichlorophenoxy acetic acid (2,4D) and methylchlorophenoxy acetic acid (MCPA) on growth, photosynthesis, and nitrogenase activity of cyanobacteria has been investigated. Concentrations ranging from 10(-9) to 10(-3) M did not change significantly the parameters of Anabaena UAM 202. Concentrations higher than 10(-3) M of both herbicides were toxic. The primary toxic action of these herbicides in Anabaena UAM 202 was on photosynthesis.
authors.affiliation: Departamento de Biología, Facultad de Ciencias, Universidad Autónoma de Madrid, Spain.
authors.forename: F
authors.initials: F
authors.lastname: Leganés
authors.forename: E
authors.initials: E
authors.lastname: Fernández-Valiente
mesh_terms: D015084:2,4-Dichlorophenoxyacetic Acid / Q000494:pharmacology*; D008456:2-Methyl-4-chlorophenoxyacetic Acid / Q000494:pharmacology*; D000458:Cyanobacteria / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D006540:Herbicides / Q000494:pharmacology*; D009591:Nitrogenase / Q000032:analysis*; D012275:Oryza; D010788:Photosynthesis / Q000187:drug effects*
chemical_list: D006540:Herbicides; D015084:2,4-Dichlorophenoxyacetic Acid; D008456:2-Methyl-4-chlorophenoxyacetic Acid; D009591:Nitrogenase