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

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.

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Contribution No., Research Institute, Agriculture Canada, London, Ontario.

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Tu, C.M. Effects of pesticide seed treatments onRhizobium japonicum and its symbiotic relationship with soybean. Bull. Environ. Contam. Toxicol. 18, 190–199 (1977). https://doi.org/10.1007/BF01686066

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Keywords

  • Acetylene
  • Lindane
  • Chlorpyrifos
  • Disulphide
  • Seed Treatment