title: Toxicity of a rice field herbicide in some nitrogen-fixing algae.
abstract: The incorporation of diquat into cultures of Nostoc muscorum and Cylindrospermum sp. Proved to be highly toxic. The range of various concentrations employed varies from 1 microgram/ml 15 micrograms/ml. Relatively higher does (above 5 micrograms/ml) reduced the chlorophyll a content and a progressive decrease in algal growth and ultimately complete lysis of the cells was recorded with the increasing level of the herbicide. A concentration of 15 micrograms/ml has been found to be algicidal for both the test organism.
mesh_terms: D002734:Chlorophyll / Q000032:analysis; D000077194:Chlorophyll A; D004178:Diquat / Q000633:toxicity*; D056890:Eukaryota; D006540:Herbicides / Q000633:toxicity*; D009586:Nitrogen Fixation; D012275:Oryza; D014874:Water Pollutants, Chemical / Q000633:toxicity*
chemical_list: D006540:Herbicides; D014874:Water Pollutants, Chemical; D002734:Chlorophyll; D004178:Diquat; D000077194:Chlorophyll A