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Self-Limitation of Herbicide Mobility by Phytotoxic Action

Published online by Cambridge University Press:  12 June 2017

Donald R. Geiger  and
Hank D. Bestman
Donald R. Geiger
Affiliation:
Dep. Biol., Univ. Dayton, Dayton, OH 45469, U.S.A.
Hank D. Bestman
Affiliation:
Dep. Biol., The King's College, 10766-97 Street, Edmonton, Alberta T5H 2M1, Canada
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Abstract

Translocation of phloem-mobile herbicides was inhibited by their phytotoxic action on processes that maintain assimilate translocation. Glyphosate lowered import into developing sink leaves soon after it was applied to exporting sugarbeet leaves. Later, photosynthesis slowed down and starch accumulation stopped, but export of both assimilate and glyphosate continued until it was limited by starch availability at night Experiments with field pennycress and Tartary buckwheat indicated that self-limitation of chlorsulfuron translocation probably occurred and that it resulted from lowered assimilate entry into phloem rather than from inhibition of photosynthesis or carbon allocation. Leakage of chlorsulfuron from the phloem when export was slowed down also may have contributed to its reduced translocation.

Keywords

Chlorsulfuron, 2-chloro-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]benzenesulfonamideglyphosate, N-(phosphonomethyl)glycinefield pennycress, Thlaspi arvense L. ♯ THLARsugarbeet, Beta vulgaris L.Tartary buckwheat, Fagopyrum tataricum (L.) Gaertn. ♯ FAGTAPhotosynthesisorganic translocationstarch
Type
Special Topics
Information
Weed Science , Volume 38 , Issue 3 , May 1990 , pp. 324 - 329
Copyright
Copyright © 1990 by the Weed Science Society of America 

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