Effects of pesticide seed treatments onRhizobium japonicum and its symbiotic relationship with soybean

  • C. M. Tu
Article

Summary

SeventeenRhizobium japonicum cultures isolated from soybean nodules induced formation of nodules on taproots of soybean plants. All isolates reduced acetylene to ethylene to different extentsin vitro. Paper disc assay indicated that two insecticides, lindane (γ-1,2,3,4,5,6-hexachlorocyclohexane), chlorpyrifos (O,O-diethyl O-3,5,6-trichloro-2-pyridyl phosphorothioate), and a fungicide, thiram (tetramethylthiuratn disulphide) individually or in combination caused significant inhibition of the growth ofR. japonicum No. 16.

The effects of insecticide-fungicide seed treatments on the nitrogenase activity of soybean plants in nitrogen-fixing capacity, weights of leaves, stems, and nodules were determined. Thiram, singly or in combination with lindane and/or chlorpyrifos, significantly delayed growth of the plants and affected the activity of nitrogenase in the fixation of nitrogen 3 weeks after treatments. No drastic effect of any of the pesticide treatments on soybean plant growth was observed after 8 weeks.

Keywords

Acetylene Lindane Chlorpyrifos Disulphide Seed Treatment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer-Verlag New York Inc. 1977

Authors and Affiliations

  • C. M. Tu
    • 1
  1. 1.Research InstituteAgriculture Canada University Sub Post OfficeLondonCanada

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