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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, Cuin, TA and Pottosin, II 2007 , 'Polyamines prevent NaCl-induced K+ efflux from pea mesophyll by blocking non-selective cation channels' , FEBS Letters, vol. 581, no. - , pp. 1993-1999 , doi: 10.1016/j.febslet.2007.04.032.

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Abstract

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
Authors/Creators:Shabala, SN and Cuin, TA and Pottosin, II
Keywords: Potassium; Salinity; Membrane; Putrescine; Spermine; Ion transport
Journal or Publication Title: FEBS Letters
Publisher: Elsevier BV
ISSN: 0014-5793
DOI / ID Number: 10.1016/j.febslet.2007.04.032
Additional Information:

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