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Potassium Flux and Leaf Movement in Samanea saman
Open accessAbstract
Samanea leaflets usually open in white light and fold together when darkened, but also open and dose with a circadian rhythm during prolonged darkness. Leaflet movement results from differential changes in the turgor and shape of motor cells on opposite sides of the pulvinus; extensor cells expand during opening and shrink during closure, while flexor cells shrink during opening and expand during closure but change shape more than size. Potassium in both open and closed pulvini is about 0.4 N. Flame photometric and electron microprobe analyses reveal that rhythmic and light-regulated postassium flux is the basis for pulvinar turgor movements. Rhythmic potassium flux during darkness in motor cells in the extensor region involves alternating predominance of inwardly directed ion pumps and leakage outward through diffusion channels, each lasting ca 12 h. White light affects the system by activating outwardly directed K+ pumps in motor cells in the flexor region.
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Changes in cell volume depend upon large changes in motor cell content of K+, Cl- and other ions.
“Changes in cell volume, in turn, depend upon large changes in motor cell content of K⁺, Cl⁻ and other ions.”
From Potassium Channels in Motor Cells of Samanea saman (1988) · cites this paper as [22]
The Results (pp. 417–418) link large changes in motor-cell K⁺ content with changes in cell size and turgor. But the Discussion (pp. 424–425) says the anions accompanying K⁺ through motor-cell membranes had not been identified; it identifies chloride only in guard cells. The source therefore does not establish the claim about motor-cell Cl⁻ content. (LLM, conf=0.90)
Experimental — accuracy not yet measuredCells in the extensor region of the pulvinus take up K+ and Cl- as they swell during leaflet opening, and lose both ions as they shrink during leaflet closure, while flexor cells behave in the reverse manner.
“Cells in the extensor region of the pulvinus take up K⁺ and Cl⁻ as they swell during leaflet opening, and lose both ions as they shrink during leaflet closure, while cells in the opposing (flexor) region behave in the reverse manner (12, 22, 23, 25, 30, 32).”
From Potassium Channels in Motor Cells of Samanea saman (1988) · cites this paper as [22]
The Results (pp. 417–419) link opening with higher K+ content and turgor in extensor cells, and describe the opposite pattern in flexor cells. But the Discussion (pp. 424–425) says the anions accompanying K+ through motor-cell membranes had not been identified, so this paper does not establish the claimed Cl− flux. (LLM, conf=0.91)
Experimental — accuracy not yet measuredLeaflet movements in Samanea saman are driven by the shrinking and swelling of cells in opposing extensor and flexor regions of the motor organ (pulvinus).
“Leaflet movements in Samanea saman are driven by the shrinking and swelling of cells in opposing (extensor and flexor) regions of the motor organ (pulvinus).”
From Potassium Channels in Motor Cells of Samanea saman (1988) · cites this paper as [22]
Assuming an average motor cell internal K+ concentration of 500 mM, an average cell measuring 32 μm in diameter would contain 8 pmol K+.
“Assuming the average motor cell internal [K⁺] = 500 mm (22), an average cell measuring 32 μm in diameter (see Results section) would contain 8 pmol K⁺.”
From Potassium Channels in Motor Cells of Samanea saman (1988) · cites this paper as [22]
The Results (pp. 417–419) report changes in motor-tissue K⁺ content, but do not give an average intracellular concentration of 500 mM. Searches for that concentration and for the 32 μm cell diameter or 8 pmol estimate found no matching passage in our copy; the citing sentence identifies the diameter as coming from its own Results section. (LLM, conf=0.76)
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Citations
Cited by
Sorted by citations
Light-stimulated inositolphospholipid turnover in Samanea saman leaf pulvini
Morse, M. J., Crain, R. C., & Satter, R. L. (1987) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.84.20.7075 · Cited by 125
Self-citationPotassium Channels in Motor Cells of Samanea saman
Moran, N., Ehrenstein, G., Iwasa, K., Mischke, C., Bare, C., & Satter, R. L. (1988) · Plant Physiology · doi:10.1104/pp.88.3.643 · Cited by 115
Self-citationRhythmic and phytochrome-regulated changes in transmembrane potential in Samanea pulvini
RACUSEN, R., & SATTER, R. L. (1975) · Nature · doi:10.1038/255408a0 · Cited by 96
Self-citation
Metadata
- Authors
- Satter, R. L., Geballe, G. T., Applewhite, P. B., & Galston, A. W.
- Affiliations
- Yale University (US)
- Venue
- The Journal of General Physiology
- Publisher
- Rockefeller University Press
- Published
- 1974-10-01
- Volume
- 64
- Issue
- 4
- Pages
- 413-430
- ISSN
- 0022-1295 (ISSN-L)
- 1540-7748
- PMC
- PMC2226155
- OpenAlex
- W2149057930
- Cited by
- 113
- References
- 0
- Citations by year
- 2026: 1 · 2025: 3 · 2024: 1 · 2023: 1 · 2022: 3 · 2021: 2 · 2019: 1 · 2015: 1 · 2012: 2
- FWCI
- 13.24
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- The Journal of General Physiology (publishedVersion)
- PubMed Central (publishedVersion, cc-by-nc-sa)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Light effects on plants
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant and Biological Electrophysiology Studies
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Molecular Biology Research
- Keywords
- Samanea saman, leaflet movement, pulvinus, potassium flux, circadian rhythm, turgor pressure, ion pumps, plant movement
- MeSH terms
- Biological Transport, Active, Circadian Rhythm, Electron Probe Microanalysis, Light, Movement, Plants, Potassium, Spectrophotometry, Atomic, Plant Physiological Phenomena
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