ArticlePlant physiology2013
Role of the putative osmosensor Arabidopsis histidine kinase1 in dehydration avoidance and low-water-potential response.
Article in Plant physiology, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 52 papers.
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52 citing papers in PubMed, 105 citations in OpenAlex.
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- The Arabidopsis PM19L1 Protein Functions as a Regulator of Germination Under Osmotic Stress.Plant direct · 2025Article
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- How sterols affect protoplasts plasma membrane water permeability and their volume under osmotic shock.Journal of plant research · 2025Article
- Analysis on the salt tolerance of Nitraria sibirica Pall. based on Pacbio full-length transcriptome sequencing.Plant cell reports · 2023Article
- N6-methyladenosine RNA modification regulates cotton drought response in a CaPlant biotechnology journal · 2023Article
- Signals and Their Perception for Remodelling, Adjustment and Repair of the Plant Cell Wall.International journal of molecular sciences · 2023Review
- Searching for Osmosensing Determinants in Poplar Histidine-Aspartate Kinases.International journal of molecular sciences · 2023Article
- Burning questions for a warming and changing world: 15 unknowns in plant abiotic stress.The Plant cell · 2023Article
- Root osmotic sensing from local perception to systemic responses.Stress biology · 2022Review
- Combined Drought and Heat Stress Influences the Root Water Relation and Determine the Dry Root Rot Disease Development Under Field Conditions: A Study Using Contrasting Chickpea Genotypes.Frontiers in plant science · 2022Article
- Genome-wide identification and expression analysis of two-component system genes in sweet potato (Frontiers in plant science · 2022Article
- Cytokinin and abiotic stress tolerance -What has been accomplished and the way forward?Frontiers in genetics · 2022Review
- Molecular Mechanisms of Plant Responses to Salt Stress.Frontiers in plant science · 2022Review
- Inter-tissue and inter-organ signaling in drought stress response and phenotyping of drought tolerance.The Plant journal : for cell and molecular biology · 2022Review
- Ectopic expression of GmHP08 enhances resistance of transgenic Arabidopsis toward drought stress.Plant cell reports · 2021Article
- Gene Expression Analysis of Microtubers of PotatoPlants (Basel, Switzerland) · 2021Article
- Advances in Sensing, Response and Regulation Mechanism of Salt Tolerance in Rice.International journal of molecular sciences · 2021Review
- Signal Integration in Plant Abiotic Stress Responses via Multistep Phosphorelay Signaling.Frontiers in plant science · 2021Review
Corrections and comments
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3 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The molecular basis of plant osmosensing remains unknown. Arabidopsis (Arabidopsis thaliana) Histidine Kinase1 (AHK1) can complement the osmosensitivity of yeast (Saccharomyces cerevisiae) osmosensor mutants lacking Synthetic Lethal of N-end rule1 and SH3-containing Osmosensor and has been proposed to act as a plant osmosensor. We found that ahk1 mutants in either the Arabidopsis Nossen-0 or Columbia-0 background had increased stomatal density and stomatal index consistent with greater transpirational water loss. However, the growth of ahk1 mutants was not more sensitive to controlled moderate low water potential (ψ(w)) or to salt stress. Also, ahk1 mutants had increased, rather than reduced, solute accumulation across a range of low ψ(w) severities. ahk1 mutants had reduced low ψ(w) induction of Δ(1)-Pyrroline-5-Carboxylate Synthetase1 (P5CS1) and 9-cis-Epoxycarotenoid Dioxygenase3, which encode rate-limiting enzymes in proline and abscisic acid (ABA) synthesis, respectively. However, neither Pro nor ABA accumulation was reduced in ahk1 mutants at low ψ(w). P5CS1 protein level was not reduced in ahk1 mutants. This indicated that proline accumulation was regulated in part by posttranscriptional control of P5CS1 that was not affected by AHK1. Expression of AHK1 itself was reduced by low ψ(w), in contrast to previous reports. These results define a role of AHK1 in controlling stomatal density and the transcription of stress-responsive genes. These phenotypes may be mediated in part by reduced ABA sensitivity. More rapid transpiration and water depletion can also explain the previously reported sensitivity of ahk1 to uncontrolled soil drying. The unimpaired growth, ABA, proline, and solute accumulation of ahk1 mutants at low ψ(w) suggest that AHK1 may not be the main plant osmosensor required for low ψ(w) tolerance.
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