Journal of Experimental Botany, Vol. 52, No. 363, pp. 2023-2032,
October 1, 2001
© 2001 Oxford University Press
Original Papers |
Protecting against water loss: analysis of the barrier properties of plant cuticles
1 Julius-von-Sachs-Institut für Biowissenschaften, Universität Würzburg, Julius-von-Sachs-Platz 3, D-97082 Würzburg, Germany
2 Botanisches Institut, Universität Bonn, Kirschallee 1, D-53115 Bonn, Germany
The cuticle is the major barrier against uncontrolled water loss from leaves, fruits and other primary parts of higher plants. More than 100 mean values for water permeabilities determined with isolated leaf and fruit cuticles from 61 plant species are compiled and discussed in relation to plant organ, natural habitat and morphology. The maximum barrier properties of plant cuticles exceed that of synthetic polymeric films of equal thickness. Cuticular water permeability is not correlated to the thickness of the cuticle or to wax coverage. Relationships between cuticular permeability, wax composition and physical properties of the cuticle are evaluated. Cuticular permeability to water increases on the average by a factor of 2 when leaf surface temperature is raised from 15 °C to 35 °C. Organic compounds of anthropogenic and biogenic origin may enhance cuticular permeability. The pathway taken by water across the cuticular transport barrier is reviewed. The conclusion from this discussion is that the bulk of water diffuses as single molecules across a lipophilic barrier while a minor fraction travels along polar pores. Open questions concerning the mechanistic understanding of the plant cuticular transport barrier and the role the plant cuticle plays in ensuring the survival and reproductive success of an individual plant are indicated.
Key words: Plant cuticles, cuticular waxes, water permeability, cuticular transpiration, adaptation, environmental effects, diffusion.
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