title: Effects of three pesticides on MSX-induced ammonia photoproduction by the cyanobacterium Nostoc linckia.
abstract: Three pesticides (2,4-D, basalin, aldrin) inhibited L-methionine-DL-sulfoximine (MSX)-induced photoproduction of ammonia by the nitrogen-fixing cyanobacterium Nostoc linckia. Combinations of pesticides and MSX were inhibitory except at low concentrations (100 and 500 micrograms/ml) of 2,4-D which stimulated NH+4 production. Similar results were obtained when pesticides were added 6 hr after the addition of MSX, but the inhibition was weaker. When MSX was added to the culture 6 hr after the addition of pesticides, the pesticides stimulated NH+4 photoproduction. Similar results were obtained on nitrogenase activity of the organism.
authors.affiliation: Department of Botany, Banaras Hindu University, India.
authors.forename: A K
authors.initials: AK
authors.lastname: Mishra
authors.forename: A B
authors.initials: AB
authors.lastname: Pandey
authors.forename: H D
authors.initials: HD
authors.lastname: Kumar
mesh_terms: D015084:2,4-Dichlorophenoxyacetic Acid / Q000494:pharmacology; D000452:Aldrin / Q000494:pharmacology; D000641:Ammonia / Q000378:metabolism*; D000814:Aniline Compounds / Q000494:pharmacology; D000458:Cyanobacteria / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism*; D008027:Light; D008717:Methionine Sulfoximine / Q000494:pharmacology*; D009591:Nitrogenase / Q000037:antagonists & inhibitors / Q000378:metabolism; D010575:Pesticides / Q000494:pharmacology*
chemical_list: D000814:Aniline Compounds; D010575:Pesticides; D008717:Methionine Sulfoximine; D015084:2,4-Dichlorophenoxyacetic Acid; D000641:Ammonia; C012322:fluchloralin; D009591:Nitrogenase; D000452:Aldrin