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High-affinity K+ uptake in pepper plants

AuthorsMartínez-Cordero, M. Angeles; Martínez, Vicente ; Rubio, Francisco
Issue DateApr-2005
PublisherOxford University Press
CitationJournal of Experimental Botany 56(416):1553-1562(2005)
AbstractHigh-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 NH+4-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 NH+4 high-affinity K+ uptake is not inhibited by NH+4. Although NH+4-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 NH+4-sensitive component of the high-affinity K+ uptake in pepper roots. CaHAK1 is strongly induced in the roots that show the NH+4-sensitive high-affinity K+ uptake and its induction is reduced in K+-starved plants grown in the presence of . The NH+4-insensitive K+ uptake may be mediated by an AKT1-like K+ channel.
Publisher version (URL)http://dx.doi.org/10.1093/jxb/eri150
Appears in Collections:(CEBAS) Artículos
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