Sodium efflux in plant roots: what do we really know?

Journal of Plant Physiology
D T Britto, H J Kronzucker

Abstract

The efflux of sodium (Na(+)) ions across the plasma membrane of plant root cells into the external medium is surprisingly poorly understood. Nevertheless, Na(+) efflux is widely regarded as a major mechanism by which plants restrain the rise of Na(+) concentrations in the cytosolic compartments of root cells and, thus, achieve a degree of tolerance to saline environments. In this review, several key ideas and bodies of evidence concerning root Na(+) efflux are summarized with a critical eye. Findings from decades past are brought to bear on current thinking, and pivotal studies are discussed, both "purely physiological", and also with regard to the SOS1 protein, the only major Na(+) efflux transporter that has, to date, been genetically characterized. We find that the current model of rapid transmembrane sodium cycling (RTSC), across the plasma membrane of root cells, is not adequately supported by evidence from the majority of efflux studies. An alternative hypothesis cannot be ruled out, that most Na(+) tracer efflux from the root in the salinity range does not proceed across the plasma membrane, but through the apoplast. Support for this idea comes from studies showing that Na(+) efflux, when measured with tracers, is rarely...Continue Reading

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Citations

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
Nov 5, 2016·Plant Physiology and Biochemistry : PPB·William J PerceySergey Shabala
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
Apr 22, 2019·The New Phytologist·Rana MunnsCaitlin S Byrt
Apr 21, 2019·The New Phytologist·Rana MunnsStephen D Tyerman
Sep 7, 2017·Scientific Reports·Arafat Abdel Hamed Abdel LatefLam-Son Phan Tran
Aug 9, 2019·The New Phytologist·Lars H Wegner, Sergey Shabala
Aug 5, 2017·Frontiers in Physiology·Dekoum V M AssahaMahmoud W Yaish
Feb 13, 2021·The Science of the Total Environment·Xin LiuYibo Ding
Mar 26, 2021·Breeding Science·Ichirou Karahara, Tomoaki Horie
May 26, 2021·Journal of Plant Physiology·Dev T BrittoHerbert J Kronzucker

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