Effect of light and different forms of nitrogen on the activity of glutamine synthetase in water hyacinth (Echhornia crassipes).
Glutamine synthetase (GS) plays a key role in nitrogen metabolism in water hyacinth (Echhornia crassipes). Its activity is influenced by environmental factors. This study investigated the effect of light intensity and different forms of nitrogen on the activity of GS in water hyacinth. It was found that ammonium and nitrate nitrogen inhibited the activity of GS in root, but promoted that of shoot. Light intensity could inhibit the activity of GS in root, but had no influence on that of shoot. The results can provide the theory foundation for explanation the mechanism of quick invasion from alien plants and further development and utilization of water hyacinth (Echhornia crassipes) in phytoremediation of polluted water.