ArticlePlant physiology2007
Participation of endomembrane cation/H+ exchanger AtCHX20 in osmoregulation of guard cells.
Article in Plant physiology, 2007. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 52 papers.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
52 citing papers in PubMed, 119 citations in OpenAlex.
- Whole-plant spatiotemporal responses to salinity reveal osmotic and ionic drivers of salt tolerance in broccoli.BMC plant biology · 2026Article
- Evaluating LED parameters in a growth chamber to maintain potato yield and enhance minitubers production in greenhouse with molecular insights.Scientific reports · 2026Article
- Article
- Identification and Expression Analysis of theBiology · 2025Article
- Genome-wide analysis of cation-proton antiporter (CPA) family involved in salt stress tolerance in pepper (Capsicum annuum L.).Molecular biology reports · 2025Article
- Single-cell sequencing and mass spectrometry imaging reveal the multicellular compartmentalization map of plant triterpenes: A ginsenoside in Panax ginseng example.Plant biotechnology journal · 2025Article
- The genetic basis of chloride exclusion in grapevines.G3 (Bethesda, Md.) · 2025Article
- Genome-Wide Identification of the Cation/Proton Antiporter (International journal of molecular sciences · 2025Article
- Genome-wide characterization of the CPA gene family in potato and a preliminary functional analysis of its role in NaCl tolerance.BMC genomics · 2024Article
- Elemental profiling and genome-wide association studies reveal genomic variants modulating ionomic composition inFrontiers in plant science · 2024Article
- Overexpression ofCurrent issues in molecular biology · 2023Article
- Transcriptome, Biochemical and Phenotypic Analysis of the Effects of a Precision Engineered Biostimulant for Inducing Salinity Stress Tolerance in Tomato.International journal of molecular sciences · 2023Article
- Enhanced reactive oxygen detoxification occurs in salt-stressed soybean roots expressing GmSALT3.Physiologia plantarum · 2022Article
- The maize single-nucleus transcriptome comprehensively describes signaling networks governing movement and development of grass stomata.The Plant cell · 2022Article
- Genome-Environment Association Analysis for Bio-Climatic Variables in Common Bean (Plants (Basel, Switzerland) · 2021Article
- Identification of Genes Preferentially Expressed in Stomatal Guard Cells ofFrontiers in plant science · 2021Article
- Potential Networks of Nitrogen-Phosphorus-Potassium Channels and Transporters in Arabidopsis Roots at a Single Cell Resolution.Frontiers in plant science · 2021Article
- Phylogenetic Diversity and Physiological Roles of Plant Monovalent Cation/HFrontiers in plant science · 2020Review
- A cross population between D. kaki and D. virginiana shows high variability for saline tolerance and improved salt stress tolerance.PloS one · 2020Article
- The different tolerance to magnesium deficiency of two grapevine rootstocks relies on the ability to cope with oxidative stress.BMC plant biology · 2019Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
6 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Guard cell movement is induced by environmental and hormonal signals that cause changes in turgor through changes in uptake or release of solutes and water. Several transporters mediating these fluxes at the plasma membrane have been characterized; however, less is known about transport at endomembranes. CHX20, a member of a poorly understood cation/H+ exchanger gene family in Arabidopsis (Arabidopsis thaliana), is preferentially and highly expressed in guard cells as shown by promoterbeta-glucuronidase activity and by whole-genome microarray. Interestingly, three independent homozygous mutants carrying T-DNA insertions in CHX20 showed 35% reduction in light-induced stomatal opening compared to wild-type plants. To test the biochemical function of CHX20, cDNA was expressed in a yeast (Saccharomyces cerevisiae) mutant that lacks Na+(K+)/H+ antiporters (Deltanhx1 Deltanha1 Deltakha1) and plasma membrane Na+ pumps (Deltaena1-4). Curiously, CHX20 did not enhance tolerance of mutants to moderate Na+ or high K+ stress. Instead, it restored growth of the mutant on medium with low K+ at slightly alkaline pH, but had no effect on growth at acidic pH. Green fluorescent protein-tagged CHX20 expressed in mesophyll protoplasts was localized mainly to membranes of the endosomal system. Furthermore, light-induced stomatal opening of the Arabidopsis mutants was insensitive to external pH and was impaired at high KCl. The results are consistent with the idea that, in exchanging K+ for H+, CHX20 maintains K+ homeostasis and influences pH under certain conditions. Together, these results provide genetic and biochemical evidence that one CHX protein plays a critical role in osmoregulation through K+ fluxes and possibly pH modulation of an active endomembrane system in guard cells.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.