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Hydroxylation of 2,4-D in Several Weed Species

Published online by Cambridge University Press:  12 June 2017

J. Fleeker  and
R. Steen
J. Fleeker
Affiliation:
Dep. of Biochem., North Dakota State Univ., Fargo, North Dakota 58102
R. Steen
Affiliation:
Dep. of Biochem., North Dakota State Univ., Fargo, North Dakota 58102
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Abstract

Wild buckwheat (Polygonum convolvulus L.), leafy spurge (Euphorbia esula L.), yellow foxtail [Setaria glauca (L.) Beauv.], and wild oat (Avena fatua L.) hydroxylated, in a 7-day period, 2 to 7% of the (2,4-dichlorophenoxy)acetic acid-1-14C (2,4-D-1-14C) absorbed. Only a trace of hydroxylation products was detected in wild mustard [Brassica kaber (DC.) L. C. Wheeler var. pinnatifida (Stokes) L. C. Wheeler], perennial sowthistle (Sonchus arvensis L.), and kochia [Kochia scoparia (L.) Roth]. The investigation was limited to hydroxylation on the para-position of the herbicide. The predominant product, 2,5-dichloro-4-hydroxyphenoxyacetic acid, was detected in all weed species studied. Also found in measurable amounts in some species were 2,3-dichloro-4-hydroxyphenoxyacetic acid and 2-chloro-4-hydroxyphenoxyacetic acid. The hydroxylation rate on the number four carbon of the ring did not account for the variation in susceptibility exhibited by these plants.

Type
Research Article
Information
Weed Science , Volume 19 , Issue 5 , September 1971 , pp. 507 - 510
Copyright
Copyright © Weed Science Society of America 

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References

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