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This article in AJ

  1. Vol. 57 No. 2, p. 140-142
    Received: June 24, 1964



Peroxidase and Polyphenoloxidase Activities and Free Ninhydrin-Positive Substances in Underground Buds of Ironweed and Leafy Spurge1

  1. W. G. Monson and
  2. F. A. Haskins2



Peroxidase activity in extracts of underground buds of ironweed and leafy spurge was at the lowest level during the period of dormancy in both species, and increased when dormancy was broken. Polyphenoloxidase activity of bud extracts was high for ironweed and very low for leafy spurge, and showed no relationship with dormancy in either species. Ninhydrin-positive substances generally and sulfur-containing amino acids in particular increased during the dormant period.

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