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Cation Penetration through Isolated Leaf Cuticles.
Plant Physiol 1974; 53(5):723-7PP

Abstract

The rates of penetration of various cations through isolated apricot Prunus armeniaca L. leaf cuticles were determined. Steady state rates were measured by using a specially constructed flow-through diffusion cell. The penetration rates of the monovalent cations in group IA followed a normal lyotropic series, i.e., CS(+) >/= Rb(+) > K(+) > Na(+) > Li(+). The divalent cations all penetrated through the cuticle more slowly than the monovalent cations. Comparison of the relative values of k (permeability coefficient) and D (diffusion coefficient) indicates that the penetration of ions through isolated cuticles took place by diffusion and was impeded by charge interactions between the solute and charge sites in the penetration pathway. Cuticular penetration rates of K(+) and H(2)O at pH above 9 were of similar magnitude. At pH 5.5 H(2)O penetration was not affected but that of K(+) was greatly reduced. From this observation and from data on cuticle titration and ion adsorption studies, we hypothesize that cuticular pores are lined with a substance (perhaps a protein) which has exposed positively charged sites.

Authors+Show Affiliations

National Environmental Research Center at Las Vegas, Las Vegas, Nevada 89114.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

16658777

Citation

McFarlane, J C.. "Cation Penetration Through Isolated Leaf Cuticles." Plant Physiology, vol. 53, no. 5, 1974, pp. 723-7.
McFarlane JC. Cation Penetration through Isolated Leaf Cuticles. Plant Physiol. 1974;53(5):723-7.
McFarlane, J. C. (1974). Cation Penetration through Isolated Leaf Cuticles. Plant Physiology, 53(5), pp. 723-7.
McFarlane JC. Cation Penetration Through Isolated Leaf Cuticles. Plant Physiol. 1974;53(5):723-7. PubMed PMID: 16658777.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Cation Penetration through Isolated Leaf Cuticles. A1 - McFarlane,J C, PY - 1974/5/1/pubmed PY - 1974/5/1/medline PY - 1974/5/1/entrez SP - 723 EP - 7 JF - Plant physiology JO - Plant Physiol. VL - 53 IS - 5 N2 - The rates of penetration of various cations through isolated apricot Prunus armeniaca L. leaf cuticles were determined. Steady state rates were measured by using a specially constructed flow-through diffusion cell. The penetration rates of the monovalent cations in group IA followed a normal lyotropic series, i.e., CS(+) >/= Rb(+) > K(+) > Na(+) > Li(+). The divalent cations all penetrated through the cuticle more slowly than the monovalent cations. Comparison of the relative values of k (permeability coefficient) and D (diffusion coefficient) indicates that the penetration of ions through isolated cuticles took place by diffusion and was impeded by charge interactions between the solute and charge sites in the penetration pathway. Cuticular penetration rates of K(+) and H(2)O at pH above 9 were of similar magnitude. At pH 5.5 H(2)O penetration was not affected but that of K(+) was greatly reduced. From this observation and from data on cuticle titration and ion adsorption studies, we hypothesize that cuticular pores are lined with a substance (perhaps a protein) which has exposed positively charged sites. SN - 0032-0889 UR - https://www.unboundmedicine.com/medline/citation/16658777/Cation_Penetration_through_Isolated_Leaf_Cuticles_ L2 - http://www.plantphysiol.org/cgi/pmidlookup?view=long&pmid=16658777 DB - PRIME DP - Unbound Medicine ER -