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Forests 2018, 9(10), 601; https://doi.org/10.3390/f9100601

Maintenance of K+/Na+ Balance in the Roots of Nitraria sibirica Pall. in Response to NaCl Stress

1
Research Center of Saline and Alkali Land of State Forestry Administration, Chinese Academy of Forestry, Beijing 100091, China
2
State Key Laboratory of Tree Genetics and Breeding, Chinese Academy of Forestry, Beijing 100091, China
3
TianJin Institute of Forestry and Pomology, TianJin 300384, China
*
Author to whom correspondence should be addressed.
Received: 10 August 2018 / Revised: 21 September 2018 / Accepted: 26 September 2018 / Published: 27 September 2018
(This article belongs to the Special Issue The Ecology of Fine Roots and Mycorrhizas in Forests)
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Abstract

Using Non-invasive Micro-test Technology (NMT), the Na+, K+ and H+ flux profiles in the root meristem regions were investigated in Nitraria sibirica Pall. seedlings under different NaCl concentrations. NaCl stress increased the K+ and Na+ contents in the roots of N. sibirica seedlings. NaCl stress significantly increased the steady Na+ efflux from the N. sibirica seedling roots. Steady K+ effluxes were measured in the control roots (without NaCl) and in the roots treated with 200 mM NaCl, and no significant differences were observed between the two treatments. The steady K+ efflux from roots treated with 400 mM NaCl decreased gradually. NaCl treatment significantly increased the H+ influx. Pharmacological experiments showed that amiloride and sodium vanadate significantly inhibited the Na+ efflux and H+ influx, suggesting that the Na+ efflux was mediated by a Na+/H+ antiporter using energy provided by plasma membrane H+-ATPase. The NaCl-induced root K+ efflux was inhibited by the K+ channel inhibitor tetraethylammonium chloride (TEA), and was significantly increased by the H+-ATPase inhibitor sodium vanadate. The NaCl-induced K+ efflux was mediated by depolarization-activated outward-rectifying K+ channels and nonselective cation channels (NSCCs). Under salt stress, N. sibirica seedlings showed increased Na+ efflux due to increased plasma membrane H+-ATPase and Na+/H+ antiporter activity. High H+ pump activity not only restricts the Na+ influx through NSCCs, but also limits K+ leakage through outward-rectifying K+ channels and NSCCs, leading to maintenance of the K+/Na+ balance and higher salt tolerance. View Full-Text
Keywords: NaCl stress; Na+ flux; K+ flux; H+ flux; Nitraria sibirica Pall.; ICP-OES; NMT NaCl stress; Na+ flux; K+ flux; H+ flux; Nitraria sibirica Pall.; ICP-OES; NMT
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Tang, X.; Yang, X.; Li, H.; Zhang, H. Maintenance of K+/Na+ Balance in the Roots of Nitraria sibirica Pall. in Response to NaCl Stress. Forests 2018, 9, 601.

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