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Characterization of the diffusion of non-electrolytes across plant cuticles: properties of the lipophilic pathway.
J Exp Bot 2006; 57(11):2501-13JE

Abstract

Systemic crop protection products are commonly sprayed onto foliage, whereupon the active substances must penetrate into the leaves in order to become biologically active. Penetration of the plant cuticle is the rate-limiting step. The diffusion of organic non-electrolytes within cuticles is a purely physical process that can be described and analysed in the same way as is done for diffusion in synthetic polymer membranes. Solute mobilities in cuticles vary considerably between plant species. For a given species they decrease with increasing solute size, and this size selectivity holds for all of the plant species investigated so far. Wax extraction from leaf cuticles increases the mobility of solutes tremendously, but size selectivity is not affected. Furthermore, diffusion within plant cuticles is extremely temperature dependent. An analogous increase in solute mobility can be achieved by using accelerators, which enhance the fluidity of the polymer matrix and of the waxes. The effects of temperature and plasticizers on the diffusion of non-electrolytes in wax and the cutin matrix have been used to characterize the nature of the lipophilic pathway. The 'free volume' theory can be used to explain the influence of the size and shape of the solute, and its dependence on temperature. The physico-chemical nature of the diffusion pathway has been shown, by thermodynamic analysis, to be identical for a wide range of solute lipophilicities. This approach also explains the mode of action and the intrinsic activity of plasticizers.

Authors+Show Affiliations

Syngenta Crop Protection AG, Research Biology, CH-4332 Stein, Switzerland. anke.buchholz@syngenta.com

Pub Type(s)

Journal Article
Review

Language

eng

PubMed ID

16829545

Citation

Buchholz, Anke. "Characterization of the Diffusion of Non-electrolytes Across Plant Cuticles: Properties of the Lipophilic Pathway." Journal of Experimental Botany, vol. 57, no. 11, 2006, pp. 2501-13.
Buchholz A. Characterization of the diffusion of non-electrolytes across plant cuticles: properties of the lipophilic pathway. J Exp Bot. 2006;57(11):2501-13.
Buchholz, A. (2006). Characterization of the diffusion of non-electrolytes across plant cuticles: properties of the lipophilic pathway. Journal of Experimental Botany, 57(11), pp. 2501-13.
Buchholz A. Characterization of the Diffusion of Non-electrolytes Across Plant Cuticles: Properties of the Lipophilic Pathway. J Exp Bot. 2006;57(11):2501-13. PubMed PMID: 16829545.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Characterization of the diffusion of non-electrolytes across plant cuticles: properties of the lipophilic pathway. A1 - Buchholz,Anke, Y1 - 2006/07/07/ PY - 2006/7/11/pubmed PY - 2006/12/9/medline PY - 2006/7/11/entrez SP - 2501 EP - 13 JF - Journal of experimental botany JO - J. Exp. Bot. VL - 57 IS - 11 N2 - Systemic crop protection products are commonly sprayed onto foliage, whereupon the active substances must penetrate into the leaves in order to become biologically active. Penetration of the plant cuticle is the rate-limiting step. The diffusion of organic non-electrolytes within cuticles is a purely physical process that can be described and analysed in the same way as is done for diffusion in synthetic polymer membranes. Solute mobilities in cuticles vary considerably between plant species. For a given species they decrease with increasing solute size, and this size selectivity holds for all of the plant species investigated so far. Wax extraction from leaf cuticles increases the mobility of solutes tremendously, but size selectivity is not affected. Furthermore, diffusion within plant cuticles is extremely temperature dependent. An analogous increase in solute mobility can be achieved by using accelerators, which enhance the fluidity of the polymer matrix and of the waxes. The effects of temperature and plasticizers on the diffusion of non-electrolytes in wax and the cutin matrix have been used to characterize the nature of the lipophilic pathway. The 'free volume' theory can be used to explain the influence of the size and shape of the solute, and its dependence on temperature. The physico-chemical nature of the diffusion pathway has been shown, by thermodynamic analysis, to be identical for a wide range of solute lipophilicities. This approach also explains the mode of action and the intrinsic activity of plasticizers. SN - 0022-0957 UR - https://www.unboundmedicine.com/medline/citation/16829545/Characterization_of_the_diffusion_of_non_electrolytes_across_plant_cuticles:_properties_of_the_lipophilic_pathway_ L2 - https://academic.oup.com/jxb/article-lookup/doi/10.1093/jxb/erl023 DB - PRIME DP - Unbound Medicine ER -