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Forests 2018, 9(10), 601;

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

Research Center of Saline and Alkali Land of State Forestry Administration, Chinese Academy of Forestry, Beijing 100091, China
State Key Laboratory of Tree Genetics and Breeding, Chinese Academy of Forestry, Beijing 100091, China
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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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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