Heterologous expression of the MiHAK14 homologue from Mangifera indica enhances plant tolerance to K+ deficiency and salinity stress in Arabidopsis
文献类型： 外文期刊
作者： Zhang, Yue 1 ; Shi, Xiaomeng 1 ; Lin, Shizhuo 1 ; Wang, Jianping 2 ; Tang, Meiling 1 ; Huang, Jianfeng 3 ; Gao, Taiping 3 ; Zhang, Hongxia 1 ; Song, Zhizhong 1 ;
作者机构： 1.Ludong Univ, Engn Res Inst Agr & Forestry, Key Lab Mol Module Based Breeding High Yield & Ab, 186 Middle Hongqi Rd, Yantai 264025, Peoples R China
2.Yantai Acad Agr Sci, 24 West Gangcheng Rd, Yantai 264000, Peoples R China
3.Chinese Acad Trop Agr Sci, Trop Crops Genet Resources Inst, 4 Xueyuan Rd, Haikou 571100, Hainan, Peoples R China
关键词： Mango; Potassium; KT; HAK; KUP family transporter; Ion homeostasis; Stress tolerance
期刊名称：PLANT GROWTH REGULATION （ 影响因子：3.242； 五年影响因子：3.607 ）
ISSN： 0167-6903
年卷期： 2022 年 98 卷 1 期
页码：
收录情况： SCI
摘要： As one of the most abundant ions in cells, sufficient amount of potassium (K+) is closely related to plant growth and development and contributes to plant tolerance to various abiotic stresses. However, molecular mechanisms involved in K+ uptake and transport are unclear in tropical fruit trees. In this study, 18 KT/HAK/KUP family genes (MiHAKs) were isolated from mango and characterized in mango. Results showed that MiHAKs were variable across the tissues examined and responded differentially to K+ depletion, PEG, and NaCl stresses in roots. In this tissue, K+ depletion and exogenous PEG significantly enhanced, while NaCl treatment reduced expression of responsive MiHAK genes. In particular, MiHAK14 was the most abundant KT/HAK/KUP gene in mango, especially in roots. Functional complementation in the TK2420 mutant revealed that MiHAK14 could take up exogenous K+. Moreover, overexpression of MiHAK14 in Arabidopsis enhanced plant tolerance to K+ depletion and NaCl stress with strengthened K+ nutritional status and ROS scavenging ability. This study provides molecular basis for further functional studies of KT/HAK/KUP transporters in tropical fruit trees, and favorably demonstrates the essentiality of K+ homeostasis in plant tolerance to abiotic stress, including K+ deficiency and NaCl stress.
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