Pathre, U.V. ; Sinha, A.K. ; Shirke, P.A. ; Ranade, S.A. (2004) Diurnal and Seasonal Modulation of Sucrose Phosphate Synthase Activity in Leaves of Prosopis juliflora Biologia Plantarum, 48 (2). pp. 227-235. ISSN 0006-3134
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Official URL: http://doi.org/10.1023/B:BIOP.0000033449.19251.8a
Related URL: http://dx.doi.org/10.1023/B:BIOP.0000033449.19251.8a
Abstract
Diurnal changes of sucrose-phosphate synthase (SPS) activity in different seasons were measured in Prosopis juliflora (Swartz) DC. leaves. SPS activity showed large variations with two distinct peaks, one around 09:00 and another at 21:00. The diurnal pattern was apparently not due to circadian rhythm since the activities were directly related to the changes in environmental parameters (irradiance, temperature, and leaf to air vapour pressure deficit) in different seasons. During the day, the enzyme showed changes in kinetic properties, differential sensitivity to allosteric modulators, differential response to ATP concentration, to concentration of endogenous sucrose, and to protein phosphatase inhibitors. These results taken together indicate the modulation of SPS in synchrony with photosynthesis and suggest the existence of multiple levels of modulation, presumably as an adaptive response to changing environmental extremes.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs Institute of Experimental Botany, Academy of Sciences of the Czech Republic |
| Keywords: | Allosteric Modulation; Photosynthesis; Phosphorylation; Dephosphorylation; Sucrose Synthesis. |
| ID Code: | 120123 |
| Deposited On: | 23 Jun 2021 05:50 |
| Last Modified: | 23 Jun 2021 05:50 |
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