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. 2016 Jun 30;7:977. doi: 10.3389/fpls.2016.00977

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Copyright © 2016 Yuan, Leng and Wang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The structure and Na⁺ secretion pathway of a salt bladder (A) and a salt gland (B). (A) The large balloon represents the typical structure of the salt bladder. Na⁺ can be transported into the balloon and released after bladder rupture. The representative plant is Atriplex centralasiatica. (B) The typical multi-cellular salt gland and the Na⁺ pathway. The representative plant is Limonium bicolor. The photographs in (B) are reproduced from Feng et al. (2014) and Yuan et al. (2015) with some modifications. SC, secretory cell; AC, accessory cell; IC, inner cup cell; OC, outer cup cell; MC, mesophyll cell; EC, epidermal cell.