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The Inhibition of Soybean Metabolism by Cadmium and Lead

Authors
  • Chi-Ying Huang
  • Fakhri A. Bazzaz
  • Larry N. Vanderhoef
Publication Date
Jul 01, 1974
Source
PMC
Keywords
Disciplines
  • Biology
License
Unknown

Abstract

Lead (300 μm) and cadmium (18 μm) inhibit pod fresh weight in soybeans (Glycine max L.) by 35%. Eighteen micromolar cadmium caused a 30% decline in nitrogenase activity by day 52 (the day on which maximum activity was measured) and a 71% inhibition by day 59. The heavy metals depressed photosynthetic rates; when photosynthesis was depressed by 60%, as measured on the day of peak photosynthesis activity, carbohydrate did not accumulate in the nodules. The reduction of pod fresh weight correlated with the effect of lead and cadmium on several other aspects of plant metabolism (shoot, root, leaf, and nodule dry weight; nodule ammonia, protein and carbohydrate content).

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