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Brudenell, A. J. P. and Baker, D. A. and Grayson, B. T. (1995) Phloem mobility of xenobiotics: tabular review of physicochemical properties governing the output of the Kleier model. Plant Growth Regulation, 16 (3). pp. 215-231. ISSN 0167-6903

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Abstract

The Kleier model of phloem-mobility of xenobiotics combines the intermediate permeability hypothesis with the acid trap mechanism for weak acids. The output of the model is dependent on the lipophilicity of a compound, for which octanol/water partition coefficients (log Kow) have been used as a measure. The membrane permeability of xenobiotics is predicted from these partition coefficients, and the nature of the sieve tube membranes has been modelled using regressions derived from Nitella or potato permeability data. A wide range of log Kow values for herbicides, fungicides, insecticides and experimental compounds (400) have been tabulated along with the model output for various membrane parameters. The application of the model is in broad agreement with literature and experimental observations on many of the known phloem mobile herbicides and predicts low phloem mobility for the fungicides and insecticides considered here, again in agreement with the literature. The behaviour of herbicides representative of the main chemical families and modes of action are reviewed, along with examples of the few phloem-mobile fungicides and insecticides identified.

Item Type: Article
Uncontrolled Keywords: acid trap - herbicides - partition coefficient - pesticides - phloem transport - xenobiotics
Subjects: Biological Sciences > Biology > Environmental Biology
Biological Sciences > Botany > Applied Botany
Divisions: UNSPECIFIED
Depositing User: Dr Alistair JP Brudenell
Date Deposited: 13 Aug 2012 19:46
Last Modified: 13 Aug 2012 19:52
URI: http://opendepot.org/id/eprint/1330

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