Salt intolerance in Arabidopsis: shoot and root sodium toxicity, and inhibition by sodium-plus-potassium overaccumulation

Planta
Rocío Álvarez-AragónAlonso Rodríguez-Navarro

Abstract

Arabidopsis plants in NaCl suffering half growth inhibition do not suffer osmotic stress and seldom shoot Na (+) toxicity; overaccumulation of Na (+) plus K (+) might trigger the inhibition. It is widely assumed that salinity inhibits plant growth by osmotic stress and shoot Na(+) toxicity. This study aims to examine the growth inhibition of Arabidopsis thaliana by NaCl concentrations that allow the completion of the life cycle. Unaffected Col-0 wild-type plants were used to define nontoxic Na(+) contents; Na(+) toxicities in shoots and roots were analyzed in hkt1 and sos1 mutants, respectively. The growth inhibition of Col-0 plants at 40 mM Na(+) was mild and equivalent to that produced by 8 and 4 mM Na(+) in hkt1 and sos1 plants, respectively. Therefore, these mutants allowed to study the toxicity of Na(+) in the absence of an osmotic challenge. Col-0 and Ts-1 accessions showed very different Na(+) contents but similar growth inhibitions; Ts-1 plants showed very high leaf Na(+) contents but no symptoms of Na(+) toxicity. Ak-1, C24, and Fei-0 plants were highly affected by NaCl showing evident symptoms of shoot Na(+) toxicity. Increasing K(+) in isotonic NaCl/KCl combinations dramatically decreased the Na(+) content in all Ara...Continue Reading

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Citations

Apr 4, 2017·The Plant Journal : for Cell and Molecular Biology·Rocío Álvarez-Aragón, Alonso Rodríguez-Navarro
Sep 7, 2018·Physiologia Plantarum·Manuel Nieves-CordonesFrancisco Rubio
Apr 11, 2019·Plant Molecular Biology·Mohammed AlbaqamiAnireddy S N Reddy
Mar 27, 2020·Frontiers in Plant Science·Natalia RaddatzJosé M Pardo
Aug 5, 2017·Frontiers in Physiology·Dekoum V M AssahaMahmoud W Yaish
Mar 5, 2019·Frontiers in Plant Science·Stanislav V Isayenkov, Frans J M Maathuis
May 28, 2021·Nature·Shuai HuangJohn D MacMicking

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