HORT640 - Metabolic Plant Physiology
Utilization of Nitrogen by Plants
Pathways of Nitrogen Assimilation in Roots
Key to enzymes involved in nitrogen assimilation in plant roots (Oaks, 1992):
1. Nitrogenase (legumes only, in association with nitrogen-fixing bacteria)
2. Nitrate uptake system
3. Nitrate reductase (NR)
4. Nitrite reductase (NiR)
5. Glutamine synthetase (GS)
6. Glutamate synthase (GOGAT)
7. Glutamate dehydrogenase (GDH)
8. Phosphoenolpyruvate carboxylase (PEPcase)
9. Ferredoxin pyridine nucleotide reductase
10. Asparagine synthetase
11. Glutamate-oxaloacetate aminotransferase
References:
Oaks A 1992 Re-evaluation of nitrogen assimilation in roots. Bioscience 42: 103-111.
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