Depression of Carbohydrate in Marine Algae by Urea Herbicides

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Abstract
Representative species of six genera of marine unicellular algae (Chlorococcumsp.,Dicrateria inornataParke,Dunaliella tertiolectaButcher,Nannochlorissp.,Isochrysis galbanaParke, andMonochrysis lutheriDroop) were treated in unialgal culture with 3-(3,4-dichlorophenyl)-1,1-dimethylurea (diuron), 1-butyl-3-(3,4-dichlorophenyl)-1-methylurea (neburon), 3-(p-chlorophenyl)-1,1-dimethylurea (monuron), and 1,1-dimethyl-3-phenylurea (fenuron). Tests were conducted at salinities of 5, 10, 20, and 30 parts per thousand (ppt). The herbicides depressed concentration of carbohydrate in all species.Dunaliella tertiolectawas most resistant; its carbohydrate content decreased 9.2% at 5 ppt salinity and 17.9% at 30 ppt.Chlorococcumwas most susceptible; its carbohydrate content decreased 49.1% at 5 ppt and 65.6% at 30 ppt salinity.