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The bacterial potassium transporter geneMbtrkHimproves K(+)uptake in yeast and tobacco

文献类型： 外文期刊

作者： Ding, Baojuan 1 ; Zhang, Xiaoyan 1 ; Xu, Yongsheng 1 ; An, Lijia 1 ; Liu, Xiangguo 2 ; Su, Qiao 1 ;

作者机构： 1.Dalian Univ Technol, Sch Bioengn, Dalian, Peoples R China

2.Jilin Acad Agr Sci, Inst Agr Biotechnol, Changchun, Peoples R China

期刊名称：PLOS ONE （ 影响因子：3.24； 五年影响因子：3.788 ）

ISSN： 1932-6203

年卷期： 2020 年 15 卷 8 期

页码：

收录情况： SCI

摘要： K(+)is an essential nutrient for plant growth and is responsible for many important physiological processes. K(+)deficiency leads to crop yield losses, and overexpression of K(+)transporter genes has been proven to be an effective way to resolve this problem. However, current research on the overexpression of K(+)transporter genes is limited to plant sources. TrkH is a bacterial K(+)transporter whose function generally depends on the regulation of TrkA. To date, whether TrkH can improve K(+)uptake in eukaryotic organisms is still unknown. In this study, a novelMbtrkHgene was cloned from marine microbial metagenomic DNA. Functional complementation and K+-depletion analyses revealed that MbTrkH functions in K(+)uptake in the K+-deficient yeast strain CY162. Moreover, K+-depletion assays revealed thatMbtrkHoverexpression improves plant K(+)uptake. K(+)hydroponic culture experiments showed that, compared with WT tobacco lines,MbtrkHtransgenic tobacco lines had significantly greater fresh weights, dry weights and K(+)contents. These results indicate that MbTrkH promotes K(+)uptake independently of TrkA in eukaryotes and provide a new strategy for improving K+-use efficiency in plants.

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