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Effects of atrazine on the assimilation of inorganic nitrogen in cereals
Authors:S Mohanadas  W Wallace  DJD Nicholas
Institution:Department of Agricultural Biochemistry, Waite Agricultural Research Institute, University of Adelaide, Glen Osmond, S. Australia 5064Australia
Abstract:The inclusion of sub-lethal amounts ofthe herbicide atrazine 2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine] in the nutrient solution supplied to maize and barley increased the growth of the root and shoot and the uptake of nitrate. The activities of nitrate and nitrite reductases, glutamine synthetase and glutamate synthase were enhanced and the amino acid and nitrate contents of the xylem sap increased. All these effects of atrazine were found only in plants grown with nitrate as the nitrogen source. The uptake of 15NO3? and its incorporation into protein in the root and shoot of maize and barley seedlings was significantly greater in the atrazine treated plants. However, a stimulation in the incorporation of leucine-14C] into TCA-precipitable protein of detached leaves from 7-day-old barley seedlings was obtained only in the absence of a supply of combined nitrogen either in the culture medium or in the in vitro incubation mixture containing the labelled amino acid.
Keywords:Gramineae  maize  barley  atrazine  nitrate uptake  amino compounds in xylem sap  nitrate assimilating enzymes  nitrate and amino acid incorporation into proteins  
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