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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.

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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