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Phloem Mobility of Xenobiotics. III. Sensitivity of Unified Model to Plant Parameters and Application to Patented Chemical Hybridizing Agents

Published online by Cambridge University Press:  12 June 2017

Francis C. Hsu  and
Daniel A. Kleier
Francis C. Hsu
Affiliation:
E. I. duPont de Nemours and Co., Experimental Stn., Agric. Products Dep., Wilmington, DE 19898
Daniel A. Kleier
Affiliation:
E. I. duPont de Nemours and Co., Experimental Stn., Agric. Products Dep., Wilmington, DE 19898
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Abstract

A refined model for the phloem translocation of xenobiotics in living plants is presented. The model accounts for the translocation of a xenobiotic that can exist in several ionic forms in terms of the permeabilities of these forms and the fractions of the forms that exist both within the sieve tubes and in the surrounding apoplast. Predictions of the model are quite sensitive to the description of the membranes used in the model, with optimum log Kow's and pKa's becoming more positive as the membranes become less permeable. The literature generally supports the predictions of the model. When applied to patented chemical hybridizing agents, the model predicts that most are phloem-mobile. This prediction strongly suggests that the chemical hybridizing agents exert their pollen-suppressing activity by direct effects on pollen and/or the surrounding maternal tissues. With low transpiration rates and the discontinuity of xylem in many reproductive tissues, phloem translocatability may be an essential requirement for the whole plant activity of many chemical hybridizing agents.

Keywords

Diuron, N′-(3,4-dichlorophenyl)-N,N-dimethylureaglyphosate, N-(phosphonomethyl)glycineamitrole, 1H-1,2,4-triazole-3-amine2,4-D, (2,4-dichlorophenoxy)acetic acidSystemic xenobioticstranslocationvascular systemintermediate permeability theoryweak acid theoryambimobility
Type
Special Topics
Information
Weed Science , Volume 38 , Issue 3 , May 1990 , pp. 315 - 323
Copyright
Copyright © 1990 by the Weed Science Society of America 

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