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Effect of intermediates of photosynthesis respiration and photorespiration on potassium nitrate and ammonium nitrate induced nitrate reductase activity in wheat


Effect of intermediates of photosynthesis respiration and photorespiration on potassium nitrate and ammonium nitrate induced nitrate reductase activity in wheat



Indian Journal of Experimental Biology 23(9): 514-517



ISSN/ISBN: 0019-5189

In the presence of KNO3 sucrose stimulated nitrate reductase (NR) activity by 578% in dark (at 200 mM conc.) and by 41% in light (at 80 mM conc.) but glucose, fructose and their 6-phosphates were ineffective. Of the respiratory intermediates tested, succinate stimulated NR activity by 28%, .alpha.-ketoglutarate by 66% and oxaloacetate by 86% in light whereas malate had no effect and citrate slightly inhibited NR activity. Glycolate (10 mM) stimulated NR activity by 123% in light and 83% in dark whereas glyoxylate, glycine and serine showed no affect. All these intermediates increased NR activity only when given along with KNO3. They had either no effect or showed a slight enhancing effect or inhibitory effect when supplied with NH4NO3.

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Accession: 005247869

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