Effect of Urea on Ammonium-dependent Synthesis of Carbamyl Phosphate during Spore Germination of Geotrichum candidum |
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| Authors: | Barash I Lowy I Pomerantz S |
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| Affiliation: | Department of Botany, Division of Mycology and Plant Pathology, Tel-Aviv University, Tel-Aviv, Israel. |
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| Abstract: | The specific activities of enzymes catalyzing the ammonium-dependent carbamyl phosphate synthesis (NH3-CPS) and the glutamine-dependent carbamyl phosphate synthesis (GLN-CPS) were increased during germination by approximately 5-and 1.7-fold respectively in the presence of 35 mm urea. The increase of NH3-CPS and GLN-CPS levels occurred immediately after the onset of germination and prior to the appearance of germ tube. Ammonium also stimulated the NH3-CPS activity, but the induction caused by urea was about three times higher than that by ammonium. |
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