Biologia Plantarum

, Volume 45, Issue 4, pp 569–573

Light-Dependent Ammonium Ion Toxicity of Rice Leaves in Response to Phosphinothricin Treatment

  • Y.-C. Tsai
  • C.H. Kao
Article

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.

glutamine synthetase Oryza sativa 

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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • Y.-C. Tsai
    • 1
  • C.H. Kao
    • 1
  1. 1.Department of AgronomyNational Taiwan UniversityTaipeiTaiwan, Republic of China

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