NDLI: Differences among plant species in cuticular permeabilities and solute mobilities are not caused by differential size selectivities

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Differences among plant species in cuticular permeabilities and solute mobilities are not caused by differential size selectivities

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Planta : Volume 206, Issue 3, August 1998

Planta : Volume 206, Issue 1, July 1998

Differences among plant species in cuticular permeabilities and solute mobilities are not caused by differential size selectivities

Content Provider	Springer Nature Link
Author	Buchholz, Anke Baur, Peter Schönherr, Jörg
Copyright Year	1998
Abstract	Solute mobilities in cuticular membranes of six species (Hedera helix, Malus domestica, Populus alba, Pyrus communis, Stephanotis floribunda, Strophantus gratus) were measured using plant hormones, growth regulators and other organic model compounds varying in molar volumes from 99 to 349 mL · mol−1 The dependence of mobilities (k) on molar volume (V x ) was exponential and could be described with equations of the type log k=log k0−′ V x . The y-intercepts (log k0) represent mobilities of a hypothetical solute of zero molar volume. The parameter β′ is a measure of size selectivity of cuticular membranes and no differences among the six species were observed. At 25 °C the average β′ was 0.0095 mol · mL−1. Solute mobility decreased by about a factor of 8.9 when molar volume increased by 100 mL · mol−1 and the mobility of a compound with V x = 100 mL · mol−1 was about 700-fold higher than the mobility of a compound with V x = 400 mL · mol−1. Size selectivity decreased with increasing temperatures and for Strophantusβ′-values of 1.6 × 10−2 to 8.0 × 10-4 mol · mL−1 were obtained for 10 and 30 °C, respectively. The-intercepts (log k0) differed among plant species by 3 orders of magnitude and since size selectivity was the same for all species, solute mobilities for solutes having zero molar volumes were the sole cause for differences among species in solute mobilities and permeabilities. We argue that these differences in k0 are related to tortuosity of the diffusion path. These results were used to derive an equation which predicts rates of cuticular penetration on the basis of k*0, the average size selectivity of 9.5 × 10−3 mol · mL−1 and the driving forces of penetration.
Starting Page	322
Ending Page	328
Page Count	7
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	206
Issue Number	2
e-ISSN	14322048
Language	English
Publisher	Springer-Verlag
Publisher Date	1998-08-06
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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