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- W2034175172 abstract "Here, the contribution of the HAK1 transporter, the AKT1 channel and a putative AtCHX13 homolog to K+ uptake in the high-affinity range of concentrations in pepper plants was examined. The limited development of molecular tools in pepper plants precluded a reverse genetics study in this species. By contrast, in the model plant Arabidopsis thaliana, these type of studies have shown that NH4+ and Ba2+ may be used as specific inhibitors of the two K+ uptake systems to dissect their contribution in species in which, as in pepper, specific mutant lines are not available. By using these inhibitors together with Na+ and Cs+, the relative contributions of CaHAK1, CaAKT1 and a putative AtCHX13 homolog to K+ acquisition from diluted solutions under different regimens of K+ supply were studied. The results showed that, in plants completely starved of K+, the gene encoding CaHAK1 was highly expressed and this system is a major contributor to K+ uptake. However, K+ concentrations as low as 50 μM reduced CaHAK1 expression and the CaAKT1 channel came into play, participating together with CaHAK1 in K+ absorption. The contribution of a putative AtCHX13 homolog seemed to be low under this low K+ supply, but it cannot be ruled out that at higher K+ concentrations this system participates in K+ uptake. Studies of this type allow extension of the tools developed in model plants to understand nutrition in important crops." @default.
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- W2034175172 date "2010-11-01" @default.
- W2034175172 modified "2023-10-18" @default.
- W2034175172 title "Systems involved in K+ uptake from diluted solutions in pepper plants as revealed by the use of specific inhibitors" @default.
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- W2034175172 doi "https://doi.org/10.1016/j.jplph.2010.05.022" @default.
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