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Overexpression of Arabidopsis thaliana Na+/H+ antiporter gene enhanced salt resistance in transgenic poplar (Populus x euramericana 'Neva')

文献类型： 外文期刊

作者： Jiang, Chaoqiang 1 ; Zheng, Qingsong 1 ; Liu, Zhaopu 1 ; Xu, Wenjun 3 ; Liu, Ling 1 ; Zhao, Gengmao 1 ; Long, Xiaohua 1 ;

作者机构： 1.Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing 210095, Jiangsu, Peoples R China

2.Anhui Acad Agr Sci, Tobacco Res Inst, Hefei 230031, Anhui, Peoples R China

3.Jiangsu Qual & Tech Supervis Bur, Nanjing 210008, Jiangsu, Peoples R China

关键词： AtNHX1;Ion homeostasis;Photosynthesis;Poplar (Populus x euramericana 'Neva');Salt resistance

期刊名称：TREES-STRUCTURE AND FUNCTION （ 影响因子：2.529； 五年影响因子：2.562 ）

ISSN： 0931-1890

年卷期： 2012 年 26 卷 3 期

页码：

收录情况： SCI

摘要： Salinity is a major abiotic stress factor limiting plant growth and productivity. One possible method to enhance plant salt-resistance is to compartmentalize sodium ions away from the cytosol. In the present work, a vacuolar Na+/H+ antiporter gene AtNHX1 from Arabidopsis thaliana, was transferred into Populus x euramericana 'Neva' by Agrobacterium tumefaciens in order to enhance poplar salt-resistance. The results showed that the transgenic poplar were more resistant to NaCl than the wild-type (WT) in greenhouse condition. Compared with the WT, plant growth and photosynthetic capacity of the transgenic plants were enhanced, and the transgenic plants accumulated more Na+ and K+ in roots and leaves under the same NaCl condition, whereas malondialdehyde and relative electrical conductivity were lower. All of these properties of the transgenic poplar were likely to be a consequence of the overexpression of AtNHX1 caused Na+ sequestration in the vacuoles and improved K+ absorption, thus reducing their toxic effects. These results indicated overexpression of the AtNHX1 enhanced salt-resistance of poplar, and AtNHX1 played an important role in the compartmentation of Na+ into the vacuoles. Therefore, this study provides an effective way for improving salt resistance in trees.

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