ArticlePlant physiology1995
Is ATP Required for K+ Channel Activation in Vicia Guard Cells?
Article in Plant physiology, 1995. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.
What it found
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Who cites it
9 citing papers in PubMed, 38 citations in OpenAlex.
- cAMP activates hyperpolarization-activated Ca2+ channels in the pollen of Pyrus pyrifolia.Plant cell reports · 2011Article
- Abscisic acid regulation of guard-cell K+ and anion channels in Gbeta- and RGS-deficient Arabidopsis lines.Proceedings of the National Academy of Sciences of the United States of America · 2008Article
- Electrophysiology of turgor regulation in marine siphonous green algae.The Journal of membrane biology · 2006Review
- The Arabidopsis salt overly sensitive 4 mutants uncover a critical role for vitamin B6 in plant salt tolerance.The Plant cell · 2002Article
- A laser microsurgical method of cell wall removal allows detection of large-conductance ion channels in the guard cell plasma membrane.Protoplasma · 1999Article
- Voltage-dependent K+ channels as targets of osmosensing in guard cellsThe Plant cell · 1998Article
- Evidence for the existence of a sulfonylurea-receptor-like protein in plants: modulation of stomatal movements and guard cell potassium channels by sulfonylureas and potassium channel openers.Proceedings of the National Academy of Sciences of the United States of America · 1997Article
- Membrane-Delimited Phosphorylation Enables the Activation of the Outward-Rectifying K Channels in Motor Cell Protoplasts of Samanea saman.Plant physiology · 1996Article
- Role of the Plasma Membrane H+-ATPase in K+ Transport.Plant physiology · 1996Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
2 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
In vivo, K+ entry into guard cells via inward-rectifying K+ channels is indirectly driven by ATP via an H+-ATPase that hyperpolarizes the membrane potential. However, whether activation of the K+ channels of guard cells requires ATP remains unknown. In the present study, both whole-cell and single-channel patch-clamp techniques were used to address this question. Exogenous ATP, ADP, and adenosine-5[prime]-O-(3-thiotriphosphate) applied to the cytoplasm had no effect on whole-cell K+ currents of Vicia faba L. guard cells. Azide, an inhibitor of oxidative phosphorylation, also had no effect. However, an ATP-scavenging system, glucose plus hexokinase, inhibited whole-cell inward K+ currents by 30 to 40%. Single-channel results acquired from cytoplasm-free inside-out membrane patches showed definite activation of inward K+ channels by ATP. Other nucleotides, such as ADP, adenosine-5[prime]-O(3-thiotriphosphate), and GTP, did not increase channel activity in the membrane patches. Inward K+ channel activity in membrane patches preactivated by exogenous ATP was inhibited by glucose plus hexokinase. These results suggest that a low concentration of ATP is required for activation of the inward K+ channels of the guard-cell plasma membrane. The issue of how ATP as a signal regulates these K+ channels is discussed.
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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.