ArticlePlant physiology2002
Diurnal and circadian regulation of putative potassium channels in a leaf moving organ.
Article in Plant physiology, 2002. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 28 papers.
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Who cites it
28 citing papers in PubMed, 100 citations in OpenAlex.
- Bioorganic studies on the nyctinastic leaf-movement of plants.Proceedings of the Japan Academy. Series B, Physical and biological sciences · 2026Review
- Magnesium: An overlooked signalling ion in plant physiology and circadian regulation.Quantitative plant biology · 2026Review
- Expression analysis of genes enriched in the pulvinus ofPlant biotechnology (Tokyo, Japan) · 2025Article
- Research Progress on Plant Shaker KPlants (Basel, Switzerland) · 2024Review
- 12-Hydroxyjasmonic acid glucoside causes leaf-folding of Samanea saman through ROS accumulation.Scientific reports · 2022Article
- Multidimensional Gene Regulatory Landscape of Motor Organ Pulvinus in the Model LegumeInternational journal of molecular sciences · 2022Article
- Article
- Genome-Wide Identification, Genomic Organization, and Characterization of Potassium Transport-Related Genes inPlants (Basel, Switzerland) · 2021Article
- Brassinosteroid homeostasis is critical for the functionality of the Medicago truncatula pulvinus.Plant physiology · 2021Article
- Arbuscular Mycorrhizal FungusFrontiers in plant science · 2017Article
- Functional identification of a GORK potassium channel from the ancient desert shrub Ammopiptanthus mongolicus (Maxim.) Cheng f.Plant cell reports · 2016Article
- A vacuolar antiporter is differentially regulated in leaves and roots of the halophytic wild rice Porteresia coarctata (Roxb.) Tateoka.Molecular biology reports · 2015Article
- Comparative analysis of kdp and ktr mutants reveals distinct roles of the potassium transporters in the model cyanobacterium Synechocystis sp. strain PCC 6803.Journal of bacteriology · 2015Article
- Circadian rhythm leaf movement of Phaseolus vulgaris and the role of calcium ions.Plant signaling & behavior · 2011Article
- 12-hydroxyjasmonic acid glucoside is a COI1-JAZ-independent activator of leaf-closing movement in Samanea saman.Plant physiology · 2011Article
- Potassium (K+) gradients serve as a mobile energy source in plant vascular tissues.Proceedings of the National Academy of Sciences of the United States of America · 2011Article
- Glutamatergic elements in an excitability and circumnutation mechanism.Plant signaling & behavior · 2010Article
- Phototropism: mechanism and outcomes.The arabidopsis book · 2010Article
- The role of tobacco Aquaporin1 in improving water use efficiency, hydraulic conductivity, and yield production under salt stress.Plant physiology · 2010Article
- KT/HAK/KUP potassium transporters gene family and their whole-life cycle expression profile in rice (Oryza sativa).Molecular genetics and genomics : MGG · 2008Article
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Authors and funding
7 authors at 4 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
In a search for potassium channels involved in light- and clock-regulated leaf movements, we cloned four putative K channel genes from the leaf-moving organs, pulvini, of the legume Samanea saman. The S. saman SPOCK1 is homologous to KCO1, an Arabidopsis two-pore-domain K channel, the S. saman SPORK1 is similar to SKOR and GORK, Arabidopsis outward-rectifying Shaker-like K channels, and the S. saman SPICK1 and SPICK2 are homologous to AKT2, a weakly-inward-rectifying Shaker-like Arabidopsis K channel. All four S. saman sequences possess the universal K-channel-specific pore signature, TXXTXGYG, strongly suggesting a role in transmembrane K(+) transport. The four S. saman genes had different expression patterns within four leaf parts: "extensor" and "flexor" (the motor tissues), the leaf blades (mainly mesophyll), and the vascular bundle ("rachis"). Based on northern blot analysis, their transcript level was correlated with the rhythmic leaf movements: (a) all four genes were regulated diurnally (Spick2, Spork1, and Spock1 in extensor and flexor, Spick1 in extensor and rachis); (b) Spork1 and Spock1 rhythms were inverted upon the inversion of the day-night cycle; and (c) in extensor and/or flexor, the expression of Spork1, Spick1, and Spick2 was also under a circadian control. These findings parallel the circadian rhythm shown to govern the resting membrane K(+) permeability in extensor and flexor protoplasts and the susceptibility of this permeability to light stimulation (Kim et al., 1993). Thus, Samanea pulvinar motor cells are the first described system combining light and circadian regulation of K channels at the level of transcript and membrane transport.
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