文献类型： 外文期刊
作者： Wang, Li 1 ; Liu, Yuhui 1 ; Li, Dan 7 ; Feng, Shoujiang 4 ; Yang, Jiangwei 2 ; Zhang, Jingjing 6 ; Zhang, Junlian 1 ; Wan 1 ;
作者机构： 1.Gansu Agr Univ, Gansu Prov Key Lab Aridland Crop Sci, Gansu Key Lab Crop Genet & Germplasm Enhancement, Lanzhou 730070, Gansu, Peoples R China
2.Gansu Agr Univ, Coll Life Sci & Technol, Lanzhou, 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 Resources & Environm Sci, Lanzhou 730070, Gansu, Peoples R China
7.Longdong Univ, Qingyang 745000, Gansu, Peoples R China
8.Agr & Agri Food Canada, Swift Current Res & Dev Ctr, Swift Current, SK S9H 3X2, Canada
关键词： AtHKT1 gene; Solanum tuberosum; K+; Na+ ratio; Photosynthetic rate; Stomatal conductance; Transpiration rate
期刊名称：BMC PLANT BIOLOGY （ 影响因子：4.215； 五年影响因子：4.96 ）
ISSN： 1471-2229
年卷期： 2019 年 19 卷 1 期
页码：
收录情况： SCI
摘要： Background Survival of plants in response to salinity stress is typically related to Na+ toxicity, but little is known about how heterologous high-affinity potassium transporter (HKT) may help alleviate salt-induced damages in potato (Solanum tuberosum L.). Results In this study, we used the Arabidopsis thaliana high-affinity potassium transporter gene (AtHKT1) to enhance the capacity of potato plants to tolerate salinity stress by decreasing Na+ content and improving K+/Na+ ratio in plant leaves, while maintaining osmotic balance. Seven AtHKT1 transformed potato lines (namely T1, T2, T3, T5, T11, T13 and T15) were compared with non-transgenic control plant at molecule and whole-plant levels. The lines T3 and T13 had the highest AtHKT1 expression with the tolerance index (an quantitative assessment) being 6.8 times that of the control. At 30 days under 100 and 150 mmol L- 1 NaCl stress treatments, the T3 and T13 lines had least reductions in net photosynthetic rate, stomatal conductance and transpiration rate among the seven lines, leading to the increased water use efficiency and decreased yield loss. Conclusions We conclude that the constitutive overexpression of AtHKT1 reduces Na+ accumulation in potato leaves and promotes the K+/Na+ homeostasis that minimizes osmotic imbalance, maintains photosynthesis and stomatal conductance, and increases plant productivity.
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