Genome-Wide Identification, Characterization, and Expression of the HAK/KUP/KT Potassium Transporter Gene Family in Poncirus trifoliata and Functional Analysis of PtKUP10 under Salt Stress
文献类型： 外文期刊
作者： Jin, Longfei 1 ; Yin, Xinxing 2 ; Wen, Mingxia 1 ; Huang, Bei 1 ; Liu, Feng 1 ; Li, Xinguo 3 ; Wang, Peng 1 ;
作者机构： 1.Zhejiang Acad Agr Sci, Inst Citrus Res, Taizhou 318026, Peoples R China
2.Taizhou Vocat Coll Sci & Technol, Taizhou 318020, Peoples R China
3.Hainan Univ, Sch Trop Agr & Forestry, Dept Hort, Key Lab Qual Regulat Trop Hort Crops Hainan Prov, Haikou 570228, Peoples R China
关键词： citrus; potassium; HAK/KUP/KT gene family; salt stress
期刊名称：HORTICULTURAE （ 影响因子：3.1； 五年影响因子：3.1 ）
ISSN：
年卷期： 2024 年 10 卷 6 期
页码：
收录情况： SCI
摘要： Potassium is an essential mineral nutrient for citrus growth and stress response. In this study, the HAK/KUP/KT gene family was identified from the genome of trifoliate orange (Poncirus trifoliata). The physical and chemical properties, chromosomal location, gene structure, evolutionary relationship, conserved motifs, and tissue expression characteristics were analyzed. The expression characteristics under low potassium and salt stress were analyzed by fluorescence quantitative PCR. The function of PtKUP10 was investigated by heterologous expression in Arabidopsis thaliana. The results showed that at least 18 PtKUPs were distributed in seven chromosomes. Phylogenetic analysis showed that four PtKUPs clustered in clade I, which mediated the high-affinity potassium absorption. Gene expression analysis showed that four PtKUPs were highly expressed in root, seven PtKUPs were up-regulated by low potassium stress, and nine PtKUPs were up-regulated by salt stress. The cis-acting elements on the promoter of PtKUPs were predominantly involved in stress and hormone responses. Overexpression of PtKUP10 in Arabidopsis thaliana could enhance salt tolerance by accumulating more potassium in the shoot and reducing sodium content in the shoots and roots. These results indicated that PtKUPs play important roles in potassium absorption and salt stress response, and PtKUP10 might enhance salt tolerance by maintaining potassium and sodium homeostasis.
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