Channelling auxin action: modulation of ion transport by indole-3-acetic acid.
The growth hormone auxin is a key regulator of plant cell division and elongation. Since plants lack muscles, processes involved in growth and movements rely on turgor formation, and thus on the transport of solutes and water. Modern electrophysiological techniques and molecular genetics have shed new light on the regulation of plant ion transporters in response to auxin. Guard cells, hypocotyls and coleoptiles have advanced to major model systems in studying auxin action. This review will therefore focus on the molecular mechanism by which auxin modulates ion transport and cell expansion in these model cell types.
Becker
Dirk
D
Biocenter, Julius-von-Sachs-Institut for Biosciences, Department of Plant Molecular Physiology and Biophysics, Würzburg, Germany. dbecker@botanik.uni-wuerzburg.de
Hedrich
Rainer
R
D007210:Indoleacetic Acids / Q000494:pharmacology*; D017136:Ion Transport / Q000187:drug effects; D008954:Models, Biological; D063245:Plant Development; D010937:Plant Growth Regulators / Q000494:pharmacology*; D010944:Plants / Q000187:drug effects* / Q000378:metabolism
D007210:Indoleacetic Acids; D010937:Plant Growth Regulators; C030737:indoleacetic acid