Table of Contents
ISRN Botany
Volume 2014, Article ID 490252, 9 pages
Research Article

Overexpression of a Novel Component Induces HAK5 and Enhances Growth in Arabidopsis

1RIKEN Center for Sustainable Resource Science, 1-7-22 Suehirocho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
2Center for Research in Agricultural Genomics (CRAG), Universitat Autònoma de Barcelona, Cerdanyola del Vallès, 08193 Barcelona, Spain

Received 13 November 2013; Accepted 10 December 2013; Published 21 January 2014

Academic Editors: C. Chang, I. Paponov, and C. Xu

Copyright © 2014 Eri Adams et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Plants have developed mechanisms to adapt to the potassium deficient conditions over the years. In Arabidopsis thaliana, expression of a potassium transporter HAK5 is induced in low potassium conditions as an adaptive response to nutrient deficiency. In order to understand the mechanism in which HAK5 is regulated, the full-length cDNA overexpressor gene hunting system was employed as a screening method. Of 40 genes recovered, At4g18280 was found to be dramatically induced in response to potassium-deficiency and salt stress. Plants overexpressing this gene showed higher HAK5 expression and enhanced growth. These plants were also less sensitive to potassium-deficiency in terms of primary root growth. Taken together, these data suggest that this novel component, At4g18280, contributes to regulation of HAK5 and, consequently, tolerance to potassium-deficiency in plants.