Phloem Mobility of Xenobiotics | Zendy

Daniel A. Kleier | Zendy

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Phloem Mobility of Xenobiotics

Author(s) -

Daniel A. Kleier

Publication year - 1988

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.86.3.803

Subject(s) - phloem , dissociation constant , dissociation (chemistry) , dissociation rate , chemistry , moiety , permeability (electromagnetism) , biophysics , permeation , acid dissociation constant , biochemistry , stereochemistry , biology , organic chemistry , botany , receptor , membrane , aqueous solution

A passive diffusion model has been developed which simultaneously accounts for the dependence of phloem mobility on permeability and acid dissociation. The model is consistent with the observation that the addition of an acid moiety to an otherwise phloem immobile compound may enhance that compound's ability to move in the phloem. However, acid trapping in the basic phloem is not the only enhancement factor. Acid functionalization also lowers the effective permeability usually towards its optimum value. The unified theory predicts that for a given acid dissociation constant there is an optimum permeability and conversely for a given permeability there is an optimum dissociation constant.

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