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Uptake, Distribution, and Degradation of Simazine by Black Walnut and Yellowpoplar Seedlings

Published online by Cambridge University Press:  12 June 2017

J. R. Wichman  and
W. R. Byrnes
J. R. Wichman
Affiliation:
Dep. of Forest. and Nat. Resources, Purdue University, W. Lafayette, IN 47907
W. R. Byrnes
Affiliation:
Dep. of Forest. and Nat. Resources, Purdue University, W. Lafayette, IN 47907
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Abstract

One-year-old and 3-month-old black walnut (Juglans nigra L.) and yellowpoplar (Liriodendron tulipifera L.) seedlings were treated with ring-labeled 14C-simazine [2-chloro-4,6-bis(ethylamino)-s-triazine] in nutrient culture. Simazine uptake was measured and the levels of simazine and its degradation products monitored at 3, 6, and 9 days following treatment for 1-year-old seedlings and at 3, 8, and 13 days for 3-month-old seedlings. Concentration of simazine and the phytotoxic degradation product monodealkylated simazine [2-chloro-4-amino-6-(ethylamino)-s-triazine] were significantly higher in yellowpoplar than in black walnut leaves. For 1-year-old seedlings, higher concentrations of phytotoxic compounds in yellowpoplar than in black walnut were attributed to greater simazine degradation by black walnut. For 3-month-old seedlings, higher concentrations in yellowpoplar were attributed to greater simazine uptake by yellowpoplar and greater degradation in black walnut. Simazine degradation proceeded rapidly in both species and N-dealkylation was a major pathway. Monodealkylated simazine and 2-chloro-4,6-diamino-s-triazine were isolated from various tissues of black walnut and yellowpoplar. Hydroxysimazine [2-hydroxy-4,6-bis(ethylamino)-s-triazine] was found in yellowpoplar roots but not in any black walnut extracts. Two other degradation products were isolated but not identified.

Type
Research Article
Information
Weed Science , Volume 23 , Issue 6 , November 1975 , pp. 448 - 453
Copyright
Copyright © 1975 by the Weed Science Society of America 

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References

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