ArticlePlant physiology2010
High-affinity K(+) transport in Arabidopsis: AtHAK5 and AKT1 are vital for seedling establishment and postgermination growth under low-potassium conditions.
Article in Plant physiology, 2010. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 86 papers.
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86 citing papers in PubMed, 240 citations in OpenAlex.
- Identification of the HAK/KUP/KT Potassium Transporter Gene Family in Sweet Potato and Functional Characterization of IbHAK5A.Plants (Basel, Switzerland) · 2026Article
- Potassium Deficiency and Hormone Signalling in Plants.Plant, cell & environment · 2026Review
- The Small Auxin Upregulated RNAPlants (Basel, Switzerland) · 2026Article
- Molecular Mechanisms and Experimental Strategies for Understanding Plant Drought Response.Plants (Basel, Switzerland) · 2026Review
- SC35-mediated bZIP49 splicing regulates K⁺ channel AKT1 for salt stress adaptation in poplar.Nature communications · 2025Article
- Natural variation in potassium deficiency responses among Arabidopsis thaliana accessions.Plant & cell physiology · 2025Article
- Fusaric acid-mediated S-glutathionylation of MaAKT1 channel confers the virulence of Foc TR4 to banana.PLoS pathogens · 2025Article
- Genome-wide survey of KT/HAK/KUP genes in the genus Citrullus and analysis of their involvement in KBMC genomics · 2024Article
- The plant rhabdovirus viroporin P9 facilitates insect-mediated virus transmission in barley.The Plant cell · 2024Article
- Landscape genomics reveals genetic signals of environmental adaptation of African wild eggplants.Ecology and evolution · 2024Article
- Positive Regulatory Roles ofPlants (Basel, Switzerland) · 2024Article
- Types of Membrane Transporters and the Mechanisms of Interaction between Them and Reactive Oxygen Species in Plants.Antioxidants (Basel, Switzerland) · 2024Review
- Comparative physiological and transcriptome analysis between potassium-deficiency tolerant and sensitive sweetpotato genotypes in response to potassium-deficiency stress.BMC genomics · 2024Article
- The Molecular Mechanism of Potassium Absorption, Transport, and Utilization in Rice.International journal of molecular sciences · 2023Review
- Yeast Heterologous Expression Systems for the Study of Plant Membrane Proteins.International journal of molecular sciences · 2023Review
- Potassium nutrient status drives posttranslational regulation of a low-K response network in Arabidopsis.Nature communications · 2023Article
- Xylem KFrontiers in plant science · 2023Article
- Transcriptional and metabolic responses of apple to different potassium environments.Frontiers in plant science · 2023Article
- Potassium transporter KUP9 participates in KStress biology · 2022Article
- Transcriptional network underpinning ploidy-related elevated leaf potassium in neo-tetraploids.Plant physiology · 2022Article
26 more citing papers are in PubMed but not listed here.
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4 authors at 3 institutions in 3 countries.
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Abstract
Potassium (K(+)) is a major plant nutrient required for growth and development. It is generally accepted that plant roots absorb K(+) through uptake systems operating at low concentrations (high-affinity transport) and/or high external concentrations (low-affinity transport). To understand the molecular basis of high-affinity K(+) uptake in Arabidopsis (Arabidopsis thaliana), we analyzed loss-of-function mutants in AtHAK5 and AKT1, two transmembrane proteins active in roots. Compared with the wild type under NH(4)(+)-free growth conditions, athak5 mutant plants exhibited growth defects at 10 mum K(+), but at K(+) concentrations of 20 mum and above, athak5 mutants were visibly indistinguishable from the wild type. While germination, scored as radicle emergence, was only slightly decreased in athak5 akt1 double mutants on low-K(+) medium, double mutants failed to grow on medium containing up to 100 mum K(+) and growth was impaired at concentrations up to 450 mum K(+). Moreover, transfer of 3-d-old plants from high to low K(+) concentrations led to growth defects and leaf chlorosis at 10 mum K(+) in athak5 akt1 double mutant plants. Determination of Rb(+)(K(+)) uptake kinetics in wild-type and mutant roots using rubidium ((86)Rb(+)) as a tracer for K(+) revealed that high-affinity Rb(+)(K(+)) uptake into roots is almost completely abolished in double mutants and impaired in single mutants. These results strongly indicate that AtHAK5 and AKT1 are the two major, physiologically relevant molecular entities mediating high-affinity K(+) uptake into roots during seedling establishment and postgermination growth and that residual Rb(+)(K(+)) uptake measured in athak5 akt1 double mutant roots is insufficient to enable plant growth.
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