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A High-K+ Affinity Transporter (HKT) from Actinidia valvata Is Involved in Salt Tolerance in Kiwifruit. 2023

Shichao Gu, and Shiming Han, and Muhammad Abid, and Danfeng Bai, and Miaomiao Lin, and Leiming Sun, and Xiujuan Qi, and Yunpeng Zhong, and Jinbao Fang
National Key Laboratory for Germplasm Innovation & Utilization of Horticultural Crops, Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, China.

Ion transport is crucial for salt tolerance in plants. Under salt stress, the high-affinity K+ transporter (HKT) family is mainly responsible for the long-distance transport of salt ions which help to reduce the deleterious effects of high concentrations of ions accumulated within plants. Kiwifruit is well known for its susceptibility to salt stress. Therefore, a current study was designed to decipher the molecular regulatory role of kiwifruit HKT members in the face of salt stress. The transcriptome data from Actinidia valvata revealed that salt stress significantly induced the expression of AvHKT1. A multiple sequence alignment analysis indicated that the AvHKT1 protein contains three conserved amino acid sites for the HKT family. According to subcellular localization analysis, the protein was primarily present in the cell membrane and nucleus. Additionally, we tested the AvHKT1 overexpression in 'Hongyang' kiwifruit, and the results showed that the transgenic lines exhibited less leaf damage and improved plant growth compared to the control plants. The transgenic lines displayed significantly higher SPAD and Fv/Fm values than the control plants. The MDA contents of transgenic lines were also lower than that of the control plants. Furthermore, the transgenic lines accumulated lower Na+ and K+ contents, proving this protein involvement in the transport of Na+ and K+ and classification as a type II HKT transporter. Further research showed that the peroxidase (POD) activity in the transgenic lines was significantly higher, indicating that the salt-induced overexpression of AvHKT1 also scavenged POD. The promoter of AvHKT1 contained phytohormone and abiotic stress-responsive cis-elements. In a nutshell, AvHKT1 improved kiwifruit tolerance to salinity by facilitating ion transport under salt stress conditions.

UI MeSH Term Description Entries
D007477 Ions An atom or group of atoms that have a positive or negative electric charge due to a gain (negative charge) or loss (positive charge) of one or more electrons. Atoms with a positive charge are known as CATIONS; those with a negative charge are ANIONS.
D010940 Plant Proteins Proteins found in plants (flowers, herbs, shrubs, trees, etc.). The concept does not include proteins found in vegetables for which PLANT PROTEINS, DIETARY is available. Plant Protein,Protein, Plant,Proteins, Plant
D000077323 Salt Stress The condition that results from ion toxicity due to ion imbalances (e.g., excessive Na+ and deficiency in Mg++). Salinity Stress,Salinity Stress Reaction,Salinity Stress Reponse,Salt Stress Reaction,Salt Stress Response,Reaction, Salinity Stress,Reaction, Salt Stress,Reponse, Salinity Stress,Response, Salt Stress,Salinity Stress Reactions,Salinity Stress Reponses,Salinity Stresses,Salt Stress Reactions,Salt Stress Responses,Salt Stresses,Stress Reaction, Salinity,Stress Reaction, Salt,Stress Reponse, Salinity,Stress Response, Salt,Stress, Salinity,Stress, Salt
D000975 Antioxidants Naturally occurring or synthetic substances that inhibit or retard oxidation reactions. They counteract the damaging effects of oxidation in animal tissues. Anti-Oxidant,Antioxidant,Antioxidant Activity,Endogenous Antioxidant,Endogenous Antioxidants,Anti-Oxidant Effect,Anti-Oxidant Effects,Anti-Oxidants,Antioxidant Effect,Antioxidant Effects,Activity, Antioxidant,Anti Oxidant,Anti Oxidant Effect,Anti Oxidant Effects,Anti Oxidants,Antioxidant, Endogenous,Antioxidants, Endogenous
D055049 Salt Tolerance The ability of organisms to sense and adapt to high concentrations of salt in their growth environment. Salt-Tolerance,Saline-Tolerance,Salinity Tolerance,Salt Adaptation,Salt Adaption,Salt-Adaption,Adaptation, Salt,Adaption, Salt,Saline Tolerance,Salinity Tolerances,Salt Adaptations,Salt Adaptions,Salt Tolerances,Tolerance, Salinity,Tolerance, Salt
D018506 Gene Expression Regulation, Plant Any of the processes by which nuclear, cytoplasmic, or intercellular factors influence the differential control of gene action in plants. Plant Gene Expression Regulation,Regulation of Gene Expression, Plant,Regulation, Gene Expression, Plant
D026901 Membrane Transport Proteins Membrane proteins whose primary function is to facilitate the transport of molecules across a biological membrane. Included in this broad category are proteins involved in active transport (BIOLOGICAL TRANSPORT, ACTIVE), facilitated transport and ION CHANNELS. Biological Pump,Membrane Transport Protein,Membrane Transporter,Membrane Transporters,Metabolic Pump,Permease,Biological Pumps,Metabolic Pumps,Permeases,Pump, Biologic,Pump, Biological,Pump, Metabolic,Pumps, Biological,Pumps, Metabolic,Biologic Pump,Protein, Membrane Transport,Transport Protein, Membrane,Transport Proteins, Membrane,Transporter, Membrane,Transporters, Membrane
D029042 Actinidia A plant species of the family ACTINIDIACEAE, order ERICALES. Kiwi Plant,Actinidia deliciosa,Actinidia deliciosas,Actinidias,Kiwi Plants,Plant, Kiwi,Plants, Kiwi,deliciosas, Actinidia
D030821 Plants, Genetically Modified PLANTS, or their progeny, whose GENOME has been altered by GENETIC ENGINEERING. Genetically Modified Plants,Plants, Transgenic,Transgenic Plants,GMO Plants,Genetically Engineered Plants,Engineered Plant, Genetically,Engineered Plants, Genetically,GMO Plant,Genetically Engineered Plant,Genetically Modified Plant,Modified Plant, Genetically,Modified Plants, Genetically,Plant, GMO,Plant, Genetically Engineered,Plant, Genetically Modified,Plant, Transgenic,Plants, GMO,Plants, Genetically Engineered,Transgenic Plant

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