42K analysis of sodium-induced potassium efflux in barley: mechanism and relevance to salt tolerance

The New Phytologist
Dev T BrittoHerbert J Kronzucker

Abstract

*Stimulation of potassium (K(+)) efflux by sodium (Na(+)) has been the subject of much recent attention, and its mechanism has been attributed to the activities of specific classes of ion channels. *The short-lived radiotracer (42)K(+) was used to test this attribution, via unidirectional K(+)-flux analysis at the root plasma membrane of intact barley (Hordeum vulgare), in response to NaCl, KCl, NH(4)Cl and mannitol, and to channel inhibitors. *Unidirectional K(+) efflux was strongly stimulated by NaCl, and K(+) influx strongly suppressed. Both effects were ameliorated by elevated calcium (Ca(2+)). As well, K(+) efflux was strongly stimulated by KCl, NH(4)Cl and mannitol , and NaCl also stimulated (13)NH(4)(+) efflux. The Na(+)-stimulated K(+) efflux was insensitive to cesium (Cs(+)) and pH 4.2, weakly sensitive to the K(+)-channel blocker tetraethylammonium (TEA(+)) and quinine, and moderately sensitive to zinc (Zn(2+)) and lanthanum (La(3+)). *We conclude that the stimulated efflux is: specific neither to Na(+) as effector nor K(+) as target; composed of fluxes from both cytosol and vacuole; mediated neither by outwardly-rectifying K(+) channels nor nonselective cation channels; attributable, alternatively, to membrane disint...Continue Reading

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Citations

Jan 29, 2011·Journal of Experimental Botany·Ehsan TavakkoliGlenn K McDonald
Sep 29, 2011·Journal of Experimental Botany·Devrim CoskunHerbert J Kronzucker
Mar 24, 2012·Journal of Experimental Botany·Ehsan TavakkoliGlenn K McDonald
Aug 11, 2011·Plant & Cell Physiology·Artur CondeHernâni Gerós
Jan 23, 2016·Plant Science : an International Journal of Experimental Plant Biology·Devrim CoskunHerbert J Kronzucker
Mar 26, 2016·Frontiers in Plant Science·Ahmed M HamamHerbert J Kronzucker
Oct 20, 2015·Plant Physiology and Biochemistry : PPB·Xiaoli MaZhanjing Huang
Jun 27, 2012·Journal of Basic Microbiology·Amrita SrivastavaArun Kumar Mishra
Aug 25, 2010·The New Phytologist·Devrim CoskunHerbert J Kronzucker
Dec 2, 2010·The New Phytologist·Herbert J Kronzucker, Dev T Britto
Apr 2, 2014·Journal of Plant Physiology·Vadim Demidchik
Dec 8, 2016·Plant, Cell & Environment·Max HerzogTimothy David Colmer
Apr 4, 2017·The Plant Journal : for Cell and Molecular Biology·Rocío Álvarez-Aragón, Alonso Rodríguez-Navarro
Jan 18, 2018·Journal of Experimental Botany·Rubens Flam-ShepherdHerbert J Kronzucker
Nov 22, 2017·Physiology and Molecular Biology of Plants : an International Journal of Functional Plant Biology·Mohammad Abass AhangerR M Agarwal
Apr 23, 2020·Physiologia Plantarum·Sahana BasuGautam Kumar
Mar 30, 2017·Frontiers in Plant Science·Muhammad ArshadAbdelali Hannoufa
May 30, 2013·Metallomics : Integrated Biometal Science·Joske RuytinxKristin Adriaensen
May 26, 2021·Journal of Plant Physiology·Dev T BrittoHerbert J Kronzucker

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