AOBPreview originally published online on November 15, 2007
Annals of Botany 2008 101(1):1-4; doi:10.1093/aob/mcm278
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BOTANICAL BRIEFING |
Aquaporins and Plant Leaf Movements
Institute of Botany, Department of Applied Plant Sciences, Darmstadt University of Technology, Schnittspahnstrasse 10, D-64287 Darmstadt, Germany
* For correspondence. E-mail kaldenhoff{at}bio.tu-darmstadt.de
Received: 6 January 2006 Returned for revision: 23 March 2006 Accepted: 19 September 2007 Published electronically: 15 November 2007
Background: Plant leaf movements can be mediated by specialized motor organs, the pulvini, or can be epinastic (i.e. based on different growth velocities of the adaxial and abaxial halves of the leaf). Both processes are associated with diurnally regulated increases in rates of membrane water transport, which in many cases has been shown to be facilitated by aquaporins. Rhythmic leaf movements are known from many plant species, but few papers deal with the involvement of aquaporins in such movements.
Scope: Many details of the architecture and function of pulvini were worked out by Ruth Satter and co-workers using Samanea saman as a model organism. More recently a contribution of aquaporins to pulvinar movement in Samanea was demonstrated. Another model plant to study pulvinus-mediated leaf movements is Mimosa pudica. The contribution of both plasma membrane- and tonoplast-localized aquaporins to the seismonastic leaf movements in Mimosa was analysed. In tobacco, as an example of epinastic leaf movement, it was shown that a PIP1 aquaporin family member is an important component of the leaf movement mechanism.
Key words: Aquaporins, leaf movement, plasma membrane intrinsic proteins, epinastic, nyctinastic
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