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Polyamines prevent NaCl-induced K+ efflux from pea mesophyll by blocking non-selective cation channels


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Shabala, SN and Cuin, TA and Pottosin, II (2007) Polyamines prevent NaCl-induced K+ efflux from pea mesophyll by blocking non-selective cation channels. FEBS Letters, 581 (-). pp. 1993-1999. ISSN 0014-5793

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Despite numerous reports implicating polyamines in
plant salinity responses, the specific ionic mechanisms of polyamine-mediated adaptation to salt-stress remain elusive. In this work, we show that micromolar concentrations of polyamines are efficient in preventing NaCl-induced K+ efflux from the leaf mesophyll, and that this effect can be attributed to the inhibition of non-selective cation channels in mesophyll. The inhibition by
externally applied polyamines developed slowly over time, suggesting a cytosolic mode of action. Overall, we suggest that elevated levels of cellular polyamine may modulate the activity of plasma membrane ion channels, improving ionic relations and assisting in a plant’s adaptation to salinity.

Item Type: Article
Keywords: Potassium; Salinity; Membrane; Putrescine; Spermine; Ion transport
Journal or Publication Title: FEBS Letters
Publisher: Elsevier BV
Page Range: pp. 1993-1999
ISSN: 0014-5793
Identification Number - DOI: 10.1016/j.febslet.2007.04.032
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Date Deposited: 07 Apr 2008 14:11
Last Modified: 18 Nov 2014 03:33
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