Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 March 1965
Published in Agron J 57:140-142 (1965)
© 1965 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Peroxidase and Polyphenoloxidase Activities and Free Ninhydrin-Positive Substances in Underground Buds of Ironweed and Leafy Spurge1

W. G. Monson and F. A. Haskins2

Synopsis: 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.

1 Published with the approval of the Director as Paper No. 1519, Journal Series, Nebraska Agricultural Experiment Station. Data were taken from a thesis submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree. Mention of specific instruments and products is for identification only and does not imply any endorsement by the U. S. Department of Agriculture.

2 Formerly Assistant in Agronomy (now Research Agronomist, Crops Research Division, ARS, USDA, Ithaca, N. Y.), and Professor of Agronomy, University of Nebraska, Lincoln, Nebraska.

Received for publication June 24, 1964.




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Copyright © 1965 by the American Society of Agronomy.