Plant Cell Journal of Pharmacology and Experimental Therapeutics
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Plant Cell, Vol. 13, 139-151, January 2001, Copyright © 2001, American Society of Plant Physiologists

TRH1 Encodes a Potassium Transporter Required for Tip Growth in Arabidopsis Root Hairs

Stamatis Rigasa, Guilhem Debrossesb, Kosmas Haralampidisa, Francisco Vicente-Agulloc, Kenneth A. Feldmannd, Alexander Grabovc, Liam Dolanb, and Polydefkis Hatzopoulosa
a Laboratory of Molecular Biology, Agricultural University of Athens, Iera Odos 75, 118 55 Athens, Greece
b Department of Cell Biology, John Innes Centre, Norwich NR4 7UH, United Kingdom
c Department of Biological Sciences, Imperial College at Wye, Wye, Ashford, Kent TN25 5AH, United Kingdom
d CERES, 914 Westwood Boulevard, P.O. Box 567, Los Angeles, California 90024

Correspondence to: Polydefkis Hatzopoulos, phat{at}auadec.aua.gr (E-mail), 30-1-529-4321 (fax)

Root hair initiation involves the formation of a bulge at the basal end of the trichoblast by localized diffuse growth. Tip growth occurs subsequently at this initiation site and is accompanied by the establishment of a polarized cytoplasmic organization. Arabidopsis plants homozygous for a complete loss-of-function tiny root hair 1 (trh1) mutation were generated by means of the T-DNA–tagging method. Trichoblasts of trh1 plants form initiation sites but fail to undergo tip growth. A predicted primary structure of TRH1 indicates that it belongs to the AtKT/AtKUP/HAK K+ transporter family. The proposed function of TRH1 as a K+ transporter was confirmed in 86Rb uptake experiments, which demonstrated that trh1 plants are partially impaired in K+ transport. In line with these results, TRH1 was able to complement the trk1 potassium transporter mutant of Saccharomyces, which is defective in high-affinity K+ uptake. Surprisingly, the trh1 phenotype was not restored when mutant seedlings were grown at high external potassium concentrations. These data demonstrate that TRH1 mediates K+ transport in Arabidopsis roots and is responsible for specific K+ translocation, which is essential for root hair elongation.




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