Light-Dependent Ammonium Ion Toxicity of Rice Leaves in Response to Phosphinothricin Treatment |
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| Authors: | Y-C Tsai CH Kao |
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| Institution: | (1) Department of Agronomy, National Taiwan University, Taipei, 106, Taiwan, Republic of China |
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| Abstract: | Ammonium ion accumulation in detached rice leaves treated with phosphinothricin (PPT), an inhibitior of glutamine synthetase (GS), was investigated in the light and darkness. PPT treatment increased NH4
+ content and induced toxicity in rice leaves in the light but not in darkness, suggesting the importance of light in PPT-induced NH4
+ toxicity in detached rice leaves. PPT treatment in the light resulted in a decrease of activities of the cytosolic form of GS and the chloroplastic form of GS. The photosynthetic electron transport inhibitor 3-(3,4-dichlorophenyl)-1,1-dimethylurea reduced NH4
+ accumulation induced by PPT in the light. In darkness, PPT-induced NH4
+ accumulation and toxicity were observed in the presence of glucose or sucrose. |
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| Keywords: | glutamine synthetase Oryza sativa |
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