Light-stimulated inositolphospholipid turnover in Samanea saman leaf pulvini
Leaflets of Samanea saman open and close rhythmically, driven by an endogenous circadian clock. Light has a rapid, direct effect on the movements and also rephases the rhythm. The authors investigated whether light signals might be mediated by increased inositolphospholipid turnover, a mechanism for signal transduction that is widely utilized in animal systems. Samanea motor organs (pulvini) labeled with (/sup 3/H)inositol were irradiated briefly (5-30 sec) with white light, and membrane-localized phosphatidylinositol phosphates and their aqueous breakdown products, the inositol phosphates, were examined. After a 15-sec or longer light pulse, labeled phosphatidylinositol 4-phosphate and phosphatidylinositol 4,5-bisphosphate decreased and their labeled metabolic products inositol 1,4-biphosphate and inositol 1,4,5-trisphosphate increased changes characteristic of inositolphospholipid turnover. The authors conclude that inositolphospholipid turnover may act as a phototransduction mechanism in Samanea pulvini in a manner that is similar to that reported in animal systems.
- Research Organization:
- Univ. of Connecticut, Storrs (USA)
- OSTI ID:
- 7014999
- Journal Information:
- Proc. Natl. Acad. Sci. U.S.A.; (United States), Vol. 84:20
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
LEAVES
PHOTOCHEMISTRY
PHOSPHOLIPIDS
METABOLISM
TRITIUM COMPOUNDS
DAILY VARIATIONS
INOSITOLS
ION EXCHANGE CHROMATOGRAPHY
LIQUID COLUMN CHROMATOGRAPHY
VISIBLE RADIATION
CARBOHYDRATES
CHEMISTRY
CHROMATOGRAPHY
ELECTROMAGNETIC RADIATION
ESTERS
LABELLED COMPOUNDS
LIPIDS
MONOSACCHARIDES
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
RADIATIONS
SACCHARIDES
SEPARATION PROCESSES
VARIATIONS
140505* - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)