Regulation of ammonium-induced proline accumulation in detached rice leaves |
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Authors: | Chuan Chi Lin Ching Huei Kao |
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Affiliation: | (1) Department of Agronomy, National Taiwan University, Taipei, Taiwan, Republic of China |
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Abstract: | Accumulation of proline in response to NH4Cl was studied indetached leaves of rice (Oryza sativa cv. Taichung Native1). Increasing concentrations of NH4Cl from 50 to 200mMprogressively increased proline content and this was correlated with theincrease in ammonium content. Proline accumulation induced by NH4Clwas related to proteolysis, an increase in ornithine- -aminotransferaseactivity, a decrease in proline dehydrogenase activity, and a decrease inproline utilisation and could not be explained by NH4Cl-inducedmodification in 1-pyrroline-5-carboxylate reductase activity.The content of glutamic acid was decreased by NH4Cl, whereas theincrease in arginine and ornithine contents was found to be associated with theincrease in proline content in NH4Cl-treated detached rice leaves. |
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Keywords: | Ammonium Oryza sativa Proline accumulation |
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