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Tolerance of Birdsfoot Trefoil (Lotus corniculatus) to 2,4-D

Published online by Cambridge University Press:  12 June 2017

Cynthia Davis  and
Dean L. Linscott
Cynthia Davis
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., Dep. Agron., Cornell Univ., Ithaca, NY 14853
Dean L. Linscott
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., Dep. Agron., Cornell Univ., Ithaca, NY 14853
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Abstract

Translocation and metabolism of 14C-2,4-D [(2,4-dichlorophenoxy)acetic acid] and effects of 2,4-D on protein synthesis were compared in ‘T–68’ (2,4-D tolerant) and ‘Viking’ (susceptible) birdsfoot trefoil (Lotus corniculatus L.) in an attempt to elucidate some tolerance mechanisms. After 14C-2,4-D was applied to upper trifoliate leaves, significantly less 2,4-D was found in stems, in leaves below the treated leaves, and in roots of T–68 compared to Viking. More 2,4-D was bound to alcohol-insoluble cellular constituents of T–68 leaves, stems, and roots. When alcohol-soluble components were fractionated, slightly more 14C water-soluble compounds were found in T–68, indicating further inactivation by glycosylation. No amino acid-2,4-D conjugates were found. The rate of 14CO2 evolution from 14C-2,4-D treated seedlings in T–68 was five times that in Viking. Protein synthesis appeared to be more rapid in T–68 but the relationship to 2,4-D was not clear. In part, 2,4-D resistance in T–68 may result from its ability to inactivate 2,4-D by differential binding and conjugation and by side chain breakdown as indicated by 14CO2 release.

Keywords

Herbicide metabolismherbicide degradationherbicide selectivityauxin
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 34 , Issue 3 , May 1986 , pp. 373 - 376
Copyright
Copyright © 1986 by the Weed Science Society of America 

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References

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