Regulation of ammonium-induced proline accumulation in detached rice leaves
2001
Accumulation of proline in response to NH4Cl was studied in detached leaves of rice (Oryza sativa cv. Taichung Native 1). Increasing concentrations of NH4Cl from 50 to 200 mM progressively increased proline content and this was correlated with the increase in ammonium content. Proline accumulation induced by NH4Cl was related to proteolysis, an increase in ornithine-delta-aminotransferase activity, a decrease in proline dehydrogenase activity, and a decrease in proline utilisation and could not be explained by NH4Cl-induced modification in delta1-pyrroline-5-carboxylate reductase activity. The content of glutamic acid was decreased by NH4Cl, whereas the increase in arginine and ornithine contents was found to be associated with the increase in proline content in NH4Cl-treated detached rice leaves.
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