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Effects of phenoxy acetic herbicides on growth, photosynthesis, and nitrogenase activity in cyanobacteria from rice
F Leganés1, E Fernández-Valiente
1Departamento de Biología, Facultad de Ciencias, Universidad Autónoma de Madrid, Spain.
Archives of Environmental Contamination and Toxicology
|January 1, 1992
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.