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Title: A NON-LINEAR DYNAMIC SIMULATION MODEL FOR XENOBIOTIC TRANSPORT AND WHOLE PLANT ALLOCATION FOLLOWING FOLIAR APPLICATION. I. MODEL DEVELOPMENT

Author
item SATCHIVI, NORBERT - UNIV OF ILLINOIS
item Stoller, Edward
item Wax, Loyd
item BRISKIN, DONALD - UNIV OF ILLINOIS

Submitted to: Pesticide Biochemistry and Physiology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 5/9/2000
Publication Date: N/A
Citation: N/A

Interpretive Summary: There is a need to predict absorption, translocation, and activity of foliar applied pesticides in order to enhance pesticide efficacy and to develop new products that have desired biological properties that will allow expression of maximum activity without adverse environmental consequences. We describe a computer simulation model that integrates the physicochemical properties of the pesticide, the physiological, anatomical and biochemical characteristics of the plant, and the environmental conditions that affect plant growth. The model combines and describes all of the processes of pesticide absorption into the leaf, pesticide transport within the plant and pesticide allocation throughout the plant and predicts how the pesticide will be distributed in the plant following foliar application. This model will be useful to researchers in public and private institutions that develop/design pesticides for maximum biological activity and want to understand all the ramifications for weed management.

Technical Abstract: A dynamic, non-linear simulation model was developed for whole plant transport and allocation of xenobiotics following their application to the leaf surface. This model integrates xenobiotic physicochemical parameters (Kow, molar volume and pKa) with plant anatomical, physiological and biochemical characteristics xylem-phloem connections; membrane permeability; apoplast, symplast and vascular sap pH). Moreover, xenobiotic metabolism and water translocation through the soil-plant-atmosphere continuum (SPAC) are also taken into account. Overall, this simulation model provides a means to evaluate the interplay of plant physiological processes, xenobiotic chemical parameters and environmental parameters in determining the whole plant allocation pattern for foliar-applied xenobiotic compounds such as herbicides and other pesticides.