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Physiological Basis for the Different Phloem Mobilities of Chlorsulfuron and Clopyralid

Published online by Cambridge University Press:  12 June 2017

Malcolm D. Devine ,
Hank D. Bestman  and
William H. Vanden Born
Malcolm D. Devine
Affiliation:
Dep. Crop Sci. and Plant Ecol., Univ. Saskatchewan, Saskatoon, Sask. S7N 0W0
Hank D. Bestman
Affiliation:
The King's College, 10766 97 St., Edmonton, Alta. T5H 2M1
William H. Vanden Born
Affiliation:
Dep. Crop Sci. and Plant Ecol., Univ. Saskatchewan, Saskatoon, Sask. S7N 0W0
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Abstract

Foliar-applied clopyralid was translocated much more readily than chlorsulfuron in the phloem of Tartary buckwheat plants. This result was not due to greater penetration of clopyralid into the treated leaf or to greater retention of chlorsulfuron in the cuticle. Experiments with excised leaf disks indicated that chlorsulfuron was taken up more readily by the leaf tissue and accumulated in the tissue to a higher concentration than clopyralid. Both herbicides effluxed readily from the tissue after transfer to herbicide-free medium, indicating that the accumulation was not due to irreversible binding within the tissue. Chlorsulfuron (2.8 nmol) applied with 14C-sucrose reduced 14C export from the treated leaf. Chlorsulfuron also reduced export of 14C following exposure of the treated leaf to 14CO2 at 6, 12, or 24 h after herbicide application. This effect of chlorsulfuron could be partially reversed by pretreating the plants with a combination of 1 mM valine, leucine, and isoleucine. In similar experiments clopyralid had no effect on assimilate transport. It is concluded that phloem translocation of chlorsulfuron in sensitive species is limited by a rapid, indirect effect on phloem transport that reduces both its own translocation and that of assimilate.

Keywords

Chlorsulfuron, 2-chloro-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl) amino] carbonyl]benzenesulfonamideclopyralid, 3,6-dichloro-2-pyridinecarboxylic acidTartary buckwheat, Fagopyrum tataricum (L.) Gaertn. ♯3 FAGTAHerbicide translocationherbicide uptakephloem translocationcuticular penetration
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 38 , Issue 1 , January 1990 , pp. 1 - 9
Copyright
Copyright © 1990 by the Weed Science Society of America 

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