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Penetration, Translocation, and Metabolism of 2,4-D and 2,4,5-T in Wild and Cultivated Cucumber Plants

Published online by Cambridge University Press:  12 June 2017

F. W. Slife ,
J. L. Key ,
S. Yamaguchi  and
A. S. Crafts
F. W. Slife
Affiliation:
Agronomy, University of Illinois, Urbana
J. L. Key
Affiliation:
Botany Department University of California, Davis
S. Yamaguchi
Affiliation:
Botany Department University of California, Davis
A. S. Crafts
Affiliation:
Botany Department University of California, Davis
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Abstract

Wild cucumber (Sicyos angulatus) and cultivated cucumber (Cucumis sativus) were treated with carboxyl-labeled C142,4–D (2,4–D*) and 2,4,5–T (2,4,5–T*) and autoradiographs developed. The distribution pattern of 2,4–D* was achieved in 24 hours and changed little by the end of 4 or 8 days. The pattern of 2,4,5–T* translocation continued to change during an 8-day period, indicating a highly mobile compound. Metabolic studies indicated that considerably more 2,4–D* than 2,4,5–T* was absorbed by these species but 75% of the absorbed 2,4–D* was converted into two major metabolites within 24 hours. The absorbed 2,4,5–T* formed only traces of these metabolites even after 8 days. Evolution of C14O2 was approximately 10 times greater from 2,4–D*-treated plants than from 2,4,5–T*-treated plants. The greater phytotoxicity of 2,4,5–T on these species seems to be related to the inability of the plants to detoxify this compound as rapidly as 2,4–D.

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Type
Research Article
Information
Weeds , Volume 10 , Issue 1 , January 1962 , pp. 29 - 35
Copyright
Copyright © 1962 Weed Science Society of America 

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References

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