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Pakistan Journal of Biological Sciences
  Year: 1999 | Volume: 2 | Issue: 2 | Page No.: 327-331
DOI: 10.3923/pjbs.1999.327.331
 
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Changes in Nitrogen Metabolism in Leaves of Bean (Phaseolus vulgaris L. Cv Giza 6) in Response to Ozone

I. A. Hassan and S. Anttonen

Abstract:
White bean (Phaseolus vulgaris L. cv. Giza 6) were exposed for 35 days (8 h d‾1) to 7, 60 and 100 ppb Ozone (O3) in open- top-chambers were measured in leaves. The effect of chronic O3 stress on characteristics of nitrogen metabolism. Protein content and enzyme activity of glutamine synthetase were both shown to decrease with increasing O3 concentrations. The highest O3, concentration (100 ppb) caused increases in the levels of spermidine arid total amino acids. This was associated with an increase of the concentrations of the individual amino acids glutamine, glutamate, alanine, threonine and, especially, asparagine. The concentration of glutamine was found to be higher at the intermediate O3 level (60 ppb). Possible implications for carbohydrates metabolism and carbon partitioning are discussed.
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How to cite this article:

I. A. Hassan and S. Anttonen, 1999. Changes in Nitrogen Metabolism in Leaves of Bean (Phaseolus vulgaris L. Cv Giza 6) in Response to Ozone. Pakistan Journal of Biological Sciences, 2: 327-331.

DOI: 10.3923/pjbs.1999.327.331

URL: https://scialert.net/abstract/?doi=pjbs.1999.327.331

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