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231224s2011 xx |||||o 00| ||eng c |
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|a 10.1016/j.jplph.2011.03.002
|2 doi
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|a pubmed24n0690.xml
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|a (DE-627)NLM207145326
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|a (NLM)21458104
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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|a Alvarez-Pizarro, Juan Carlos
|e verfasserin
|4 aut
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|a NH(4)(+)-stimulated low-K(+) uptake is associated with the induction of H(+) extrusion by the plasma membrane H(+)-ATPase in sorghum roots under K(+) deficiency
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|c 2011
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 24.04.2013
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|a Date Revised 18.03.2022
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Copyright © 2011 Elsevier GmbH. All rights reserved.
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|a The effect of external inorganic nitrogen and K(+) content on K(+) uptake from low-K(+) solutions and plasma membrane (PM) H(+)-ATPase activity of sorghum roots was studied. Plants were grown for 15 days in full-nutrient solutions containing 0.2 or 1.4mM K(+) and inorganic nitrogen as NO(3)(-), NO(3)(-)/NH(4)(+) or NH(4)(+) and then starved of K(+) for 24, 48 and 72 h. NH(4)(+) in full nutrient solution significantly affected the uptake efficiency and accumulation of K(+), and this effect was less pronounced at the high K(+) concentration. In contrast, the translocation rate of K(+) to the shoot was not altered. Depletion assays showed that plants grown with NH(4)(+) more efficiently depleted the external K(+) and reached higher initial rates of low-K(+) uptake than plants grown with NO(3)(-). One possible influence of K(+) content of shoot, but not of roots, on K(+) uptake was evidenced. Enhanced K(+)-uptake capacity was correlated with the induction of H(+) extrusion by PM H(+)-ATPase. In plants grown in high K(+) solutions, the increase in the active H(+) gradient was associated with an increase of the PM H(+)-ATPase protein concentration. In contrast, in plants grown in solutions containing 0.2mM K(+), only the initial rate of H(+)-pumping and ATP hydrolysis were affected. Under these conditions, two specific isoforms of PM H(+)-ATPase were detected, independent of the nitrogen source and deficiency period. No change in enzyme activity was observed in NO(3)(-)-grown plants. The results suggest that K(+) homeostasis in NH(4)(+)-grown sorghum plants may be regulated by a high capacity for K(+) uptake, which is dependent upon the H(+)-pumping activity of PM H(+)-ATPase
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Protein Isoforms
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|a Quaternary Ammonium Compounds
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|a Solutions
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|a Proton-Translocating ATPases
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|a EC 3.6.3.14
|2 NLM
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|a Nitrogen
|2 NLM
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|a N762921K75
|2 NLM
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|a Potassium
|2 NLM
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|a RWP5GA015D
|2 NLM
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|a Gomes-Filho, Enéas
|e verfasserin
|4 aut
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|a Prisco, José Tarquínio
|e verfasserin
|4 aut
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|a Grossi-de-Sá, Maria Fátima
|e verfasserin
|4 aut
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|a de Oliveira-Neto, Osmundo Brilhante
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Journal of plant physiology
|d 1979
|g 168(2011), 14 vom: 15. Sept., Seite 1617-26
|w (DE-627)NLM098174622
|x 1618-1328
|7 nnns
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| 773 |
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|g volume:168
|g year:2011
|g number:14
|g day:15
|g month:09
|g pages:1617-26
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|u http://dx.doi.org/10.1016/j.jplph.2011.03.002
|3 Volltext
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