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JXB Advance Access originally published online on April 4, 2005
Journal of Experimental Botany 2005 56(416):1553-1562; doi:10.1093/jxb/eri150
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© The Author [2005]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oupjournals.org

RESEARCH PAPER

High-affinity K+ uptake in pepper plants

M. Angeles Martínez-Cordero, Vicente Martínez and Francisco Rubio*

Departamento de Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura-CSIC, Apartado de Correos 164, E-30100 Murcia, Spain

* To whom correspondence should be addressed. Fax: +34 968 396 213. E-mail: frubio{at}cebas.csic.es

High-affinity K+ uptake is an essential process for plant nutrition under K+-limiting conditions. The results presented here demonstrate that pepper (Capsicum annuum) plants grown in the absence of and starved of K+ show an -sensitive high-affinity K+ uptake that allows plant roots to deplete external K+ to values below 1 µM. When plants are grown in the presence of high-affinity K+ uptake is not inhibited by . Although -grown plants deplete external K+ below 1 µM in the absence of when 1 mM is present they do not deplete external K+ below 10 µM. A K+ transporter of the HAK family, CaHAK1, is very likely mediating the -sensitive component of the high-affinity K+ uptake in pepper roots. CaHAK1 is strongly induced in the roots that show the -sensitive high-affinity K+ uptake and its induction is reduced in K+-starved plants grown in the presence of . The -insensitive K+ uptake may be mediated by an AKT1-like K+ channel.

Key words: Ammonium, pepper, potassium, transport


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