The HAK1 gene of barley is a member of a large gene family and encodes a high-affinity potassium transporter

The Plant Cell
G E Santa-MaríaA Rodríguez-Navarro

Abstract

The high-affinity K+ uptake system of plants plays a crucial role in nutrition and has been the subject of extensive kinetic studies. However, major components of this system remain to be identified. We isolated a cDNA from barley roots, HvHAK1, whose translated sequence shows homology to the Escherichia coli Kup and Schwanniomyces occidentalis HAK1 K+ transporters. HvHAK1 conferred high-affinity K+ uptake to a K(+)-uptake-deficient yeast mutant exhibiting the hallmark characteristics of the high-affinity K+ uptake described for barley roots. HvHAK1 also mediated low-affinity Na+ uptake. Another cDNA (HvHAK2) encoding a polypeptide 42% identical to HvHAK1 was also isolated. Analysis of several genomes of Triticeae indicates that HvHAK1 belongs to a multigene family. Translated sequences from bacterial DNAs and Arabidopsis, rice, and possibly human cDNAs show homology to the Kup-HAK1-HvHAK1 family of K+ transporters.

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Citations

Sep 17, 2005·Journal of Bioenergetics and Biomembranes·Javier Barrero-GilBegoña Benito
Dec 18, 2004·Plant Molecular Biology·M Angeles Martínez-CorderoFrancisco Rubio
Aug 19, 2007·Plant Molecular Biology·Abdelbagi M IsmailMatthias Wissuwa
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Jul 5, 2013·Plant & Cell Physiology·Jong-Pil HongRyoung Shin
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Oct 12, 2002·Plant Physiology·María A BañuelosAlonso Rodríguez-Navarro
Feb 15, 2003·Plant Physiology·David E CardenAnthony J Miller
Feb 28, 2004·Plant Physiology·Sung Ju AhnDaniel P Schachtman
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Aug 14, 2001·Plant Physiology·P MäserM L Guerinot

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