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AtHKT1 gene regulating K+ state in whole plant improves salt tolerance in transgenic tobacco plants

文献类型： 外文期刊

作者： Wang, Li 1 ; Liu, Yuhui 1 ; Feng, Shoujiang 4 ; Wang, Zhuoyu; Zhang, Jinwen 5 ; Zhang, Junlian 1 ; Wang, Di 1 ; Gan, Y 1 ;

作者机构： 1.Gansu Agr Univ, Gansu Key Lab Crop Genet & Germplasm Enhancement, Gansu Prov Key Lab Aridland Crop Sci, Lanzhou 730070, Gansu, Peoples R China

2.Gansu Agr Univ, Coll Life Sci & Technol, Lanzhou 730070, Gansu, Peoples R China

3.Gansu Agr Univ, Coll Hort, Lanzhou 730070, Gansu, Peoples R China

4.Gansu Acad Agr Sci, Inst Soil Fertilizer & Water Saving Agr, Lanzhou 730070, Gansu, Peoples R China

5.Gansu Agr Univ, Coll Agron, Lanzhou 730070, Gansu, Peoples R China

6.Gansu Agr Univ, Coll Agron, Lanzhou 730070, Gansu, Peoples R Ch

期刊名称：SCIENTIFIC REPORTS （ 影响因子：4.379； 五年影响因子：5.133 ）

ISSN： 2045-2322

年卷期： 2018 年 8 卷

页码：

收录情况： SCI

摘要： The status of K+ is important for plant health. However, little is known about if high-affinity potassium transporter HKTs may help K+ retention under salt stress. Here, we determined the effect of Arabidopsis thaliana transporter gene (AtHKT1) on the K+ status, Na+-induced toxicity, and salt tolerance in tobacco (Nicotiana tabacum L.). Six AtHKT1 transformed tobacco lines (T1, T2,... T6) were contrasted with a non-transgenic plantlet at the whole-plant and molecule levels. AtHKT1 gene was expressed in the xylems of stem, root and leaf vein in the transgenic tobacco, with the line T3 having highest expression. At Day 15, in the 200 mmol L-1 NaCl stress treatment, the transgenic plants remained a healthy K+ status, while the control plants decreased K+ content by 70% and Na+ contents in leaves and stems were 1.7 times that in the transgenic line. The AtHKT1 expression enhanced the activities of SOD, CAT and POD, raised chlorophyll and soluble sugar contents and root activity, and decreased MDA and proline contents and electrolyte leakage destruction. The constitutive over-expression of AtHKT1 that helps maintain a healthy K+ status while reducing Na+ toxicity may serve as a possible mechanism in maximizing productivity of tobacco under salt stress.

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