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Published on November 21, 2008; 10.1104/pp.108.129494

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Received September 7, 2008
Accepted November 18, 2008

NaCl-Induced Alternations of Cellular and Tissue Ion Fluxes in Roots of Salt-Resistant and Salt-Sensitive Poplar Species

Jian Sun , Shaoliang Chen *, Songxiang Dai , Ruigang Wang , Niya Li , Xin Shen , Xiaoyang Zhou , Cunfu Lu , Xiaojiang Zheng , Zanmin Hu , Zengkai Zhang , Jin Song , and Yue Xu

College of Biological Sciences and Technology, Beijing Forestry University (Box 162), Beijing 100083, People's Republic of China; Key Laboratory of Biological Resources Protection and Utilization in Hubei Province, Hubei Institute for Nationalities, Enshi 445000, People's Republic of China; Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, People's Republic of China; Xuyue (Beijing) Science and Technology Co., Ltd., 601 Yingzhi Dasha, 49-3 Suzhoujie Street, Haidian District, Beijing 100080, People's Republic of China

* Corresponding author; email: Lschen{at}bjfu.edu.cn.

Using the Scanning Ion-selective Electrode Technique (SIET), fluxes of H+, Na+ and Cl- were investigated in roots and derived protoplasts of salt-tolerant Populus euphratica Oliv. and salt-sensitive P. popularis 35-44 (P. popularis). Compared to P. popularis, P. euphratica roots exhibited a higher capacity to extrude Na+ after a short term (ST) exposure to 50 mM NaCl (24 h) and a long term (LT) in a saline environment of 100 mM NaCl (15d). Root protoplasts, isolated from the LT-stressed P. euphratica roots, had an enhanced Na+ efflux and a correspondingly increased H+ influx, especially at an acidic pH of 5.5. However, the NaCl-induced Na+/H+ exchange in root tissues and cells was inhibited by amiloride (a Na+/H+ antiporter inhibitor) or sodium orthovanadate (a PM H+-ATPase inhibitor). These results indicate that the Na+ extrusion in stressed P. euphratica roots is the result of an active Na+/H+ antiport across the plasma membrane. In comparison, the Na+/H+ antiport system in salt stressed P. popularis roots was insufficient to exclude Na+ at both the tissue and cellular levels. Moreover, salt-treated P. euphratica roots retained a higher capacity for Cl- exclusion than P. popularis, especially during a long term in high salinity. The pattern of NaCl-induced fluxes of H+, Na+ and Cl- differs from that caused by isomotic mannitol in P. euphratica roots, suggesting that NaCl-induced alternations of root ion fluxes are mainly the result of ion-specific effects.




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