INFLUENCE OF AMMONIUM AND NITRATE NITROGEN ON NITROGENASE ACTIVITY OF PEA PLANTS AS AFFECTED BY LIGHT INTENSITY AND SUGAR ADDITION

Addition of ammonium chloride or potassium nitrate to nodulated pea plants resulted in a decrease in acetylene-reducing activity. Both nodule growth and specific activity of the nodules were diminished. Acetylene-reducing activity of isolated bacteroids, treated with EDTA-toluene and supplied with A...

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Bibliographic Details
Published in:Plant and soil 1980-02, Vol.54 (2), p.271-282
Main Author: HOUWAARD, F.
Format: Article
Language:English
Subjects:
Bacteroids
Chlorides
Laboratorium voor Microbiologie
Luminous intensity
Microbiological Laboratory
Microbiologie
Microbiology
Nitrogen
Nitrogen fixation
Nodules
Peas
Plant roots
Plants
Quaternary ammonium compounds
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Summary:Addition of ammonium chloride or potassium nitrate to nodulated pea plants resulted in a decrease in acetylene-reducing activity. Both nodule growth and specific activity of the nodules were diminished. Acetylene-reducing activity of isolated bacteroids, treated with EDTA-toluene and supplied with ATP and dithionite, had not decreased after a 3-day treatment of the plants with NH₄Cl or KNO₃. The effect of combined nitrogen could be counteracted by raising the light intensity or by the addition of sucrose to the growth medium. The latter treatment reduced the nitrogen uptake by the plants. It is concluded that combined nitrogen affects symbiotic nitrogen fixation via the carbohydrate supply to the bacteroids.
ISSN:0032-079X
1573-5036
DOI:10.1007/BF02181853