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Mode of Action and Metabolism of Diquat and Paraquat

Published online by Cambridge University Press:  12 June 2017

H. H. Funderburk Jr.  and
J. M. Lawrence
H. H. Funderburk Jr.
Affiliation:
Auburn University Agricultural Experiment Station, Auburn, Alabama
J. M. Lawrence
Affiliation:
Auburn University Agricultural Experiment Station, Auburn, Alabama
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Abstract

In short-term studies, diquat (6,7-dihydrodipyrido(1,2-a:2’,1′-c) pyrazidiinium salt) and paraquat (1,1′-dimethyl-4,4′-dipyridinium salt) caused a stimulation in respiration and an inhibition in photosynthesis of duckweed (Lemna minor L.). Atrazine (2-chloro-4-ethylamino-6-isopropylamino-s-triazine) and monuron [3-(p-chlorophenyl)-1,1-dimethylurea] caused inhibition of the Hill reaction at rates lower (10-6M) than diquat and paraquat (10-5M), and diquat was considerably more effective than paraquat. The effect of a combination of monuron and diquat on O2 production was additive. Inhibition of the Hill reaction by these dipyridyliums was directly related to their redox potentials. Auto-radiographs of chromatograms and electrochromatograms as well as CO2 studies indicated that neither diquat nor paraquat was degraded in alligatorweed [Alternanthera philoxeriodes (Mart.) Griseb.] and garden, or snap beans (Phaseolus vulgaris L. var. Black Valentine).

Type
Research Article
Information
Weeds , Volume 12 , Issue 4 , October 1964 , pp. 259 - 264
Copyright
Copyright © 1964 Weed Science Society of America 

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References

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