A putative role for the plasma membrane potential in the control of the expression of the gene encoding the tomato high-affinity potassium transporter HAK5.

Plant Molecular Biology
Manuel Nieves-CordonesFrancisco Rubio

Abstract

A chimeric CaHAK1-LeHAK5 transporter with only 15 amino acids of CaHAK1 in the N-terminus mediates high-affinity K(+) uptake in yeast cells. Kinetic and expression analyses strongly suggest that LeHAK5 mediates a significant proportion of the high-affinity K(+) uptake shown by K(+)-starved tomato (Solanum lycopersicum) plants. The development of high-affinity K(+) uptake, putatively mediated by LeHAK5, was correlated with increased LeHAK5 mRNA levels and a more negative electrical potential difference across the plasma membrane of root epidermal and cortical cells. However, this increase in high-affinity K(+) uptake was not correlated with the root K(+) content. Thus, (i) growth conditions that result in a hyperpolarized root plasma membrane potential, such as K(+) starvation or growth in the presence of NH(4) (+), but which do not decrease the K(+) content, lead to increased LeHAK5 expression; (ii) the presence of NaCl in the growth solution, which prevents the hyperpolarization induced by K(+) starvation, also prevents LeHAK5 expression. Moreover, once the gene is induced, depolarization of the plasma membrane potential then produces a decrease in the LeHAK5 mRNA. On the basis of these results, we propose that the plant membr...Continue Reading

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Citations

Jul 21, 2011·Plant & Cell Physiology·Fernando AlemánFrancisco Rubio
Mar 4, 2010·Microbiology and Molecular Biology Reviews : MMBR·Joaquín AriñoHana Sychrová
Dec 3, 2013·Journal of Experimental Botany·Isabelle ChérelHervé Sentenac
Apr 19, 2011·Annual Review of Plant Biology·Yi-Fang TsayShan-Hua Lin
Jan 22, 2013·Annual Review of Plant Biology·Yi Wang, Wei-Hua Wu
Oct 29, 2015·Journal of Experimental Botany·Sergey ShabalaIgor Pottosin
Jul 10, 2012·Journal of Plant Physiology·M HernandezE Olmos
Dec 14, 2011·Plant Physiology and Biochemistry : PPB·Francisco Javier GálvezKees Venema
Sep 29, 2009·Trends in Plant Science·Tomoaki HorieJulian I Schroeder
Feb 17, 2009·Journal of Plant Physiology·Mark W SzczerbaHerbert J Kronzucker
Mar 13, 2016·Journal of Experimental Botany·Izhar AhmadFrans J M Maathuis
Nov 13, 2008·Physiologia Plantarum·Francisco RubioVicente Martínez
Dec 2, 2010·The New Phytologist·Herbert J Kronzucker, Dev T Britto
Apr 11, 2014·Physiologia Plantarum·Francisco RubioVicente Martínez
Apr 5, 2013·Plant, Cell & Environment·Raúl HuertasMaría Pilar Rodríguez-Rosales
Nov 17, 2009·The Plant Journal : for Cell and Molecular Biology·Eduardo O LeidiJosé M Pardo
May 9, 2014·Journal of Plant Physiology·Manuel Nieves-CordonesFrancisco Rubio
Mar 27, 2010·Molecular Plant·Yi Wang, Wei-Hua Wu
Jul 6, 2010·Fungal Genetics and Biology : FG & B·José L MartínezJosé Ramos
Jul 28, 2016·Frontiers in Plant Science·Manuel Nieves-CordonesFrancisco Rubio
Sep 14, 2016·Frontiers in Plant Science·Katie A WilkinsJulia M Davies
Mar 16, 2012·European Journal of Medicinal Chemistry·Patrice L JacksonK R Scott
Jan 18, 2018·Journal of Experimental Botany·Rubens Flam-ShepherdHerbert J Kronzucker
Oct 28, 2017·Physiologia Plantarum·Anna De LucaEduardo O Leidi
Sep 7, 2018·Physiologia Plantarum·Manuel Nieves-CordonesFrancisco Rubio
Nov 3, 2015·Plant, Cell & Environment·Devrim CoskunHerbert J Kronzucker
Jul 4, 2017·The Plant Journal : for Cell and Molecular Biology·Manuel Nieves-CordonesAnne-Aliénor Véry

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