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| Publication Type:
| Refereed |
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| Author(s): | Rogers, Alistair;
Fischer, Bernt U.;
Bryant, Jonathan;
Frehner, Marco;
Blum, Herbert;
Raines, Christine A.;
Long, Stephen P. |
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| Author Affiliation: | Rogers, Bryant, Raines and Long: Department of Biological Sciences, John Tabor Laboratories, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, United Kingdom; and Fischer, Frehner and Blum: Institute of Plant Sciences, Swiss Federal Institute of Technology, Universitätstrasse 2, 8092 Zurich, Switzerland; and Long: Instrumentation Division, Building 318, Brookhaven National Laboratory, Upton, New York 11973 |
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| Title: | Acclimation of photosynthesis to elevated CO₂ under low-nitrogen nutrition is affected by the capacity for assimilate utilization. Perennial ryegrass under free-air CO₂ enrichment |
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| Source: | Plant Physiology. Vol. 118, No. 2, October 1998, p. 683-689. |
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| Publishing Information: | Rockville, MD: American Society of Plant Physiologists |
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| # of Pages: | 7 |
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| Keywords: | TIC Keywords: Acclimatization; Photosynthesis; Carbon dioxide enrichment; Low nitrogen rates; Lolium perenne; Photosynthates; Assimilation
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| Abstract/Contents: | "Acclimation of photosynthesis to elevated CO₂ has previously been shown to be more pronounced when N supply is poor. Is this a direct effect of N or an indirect effect of N by limiting the development of sinks for photoassimilate? This question was tested by growing a perennial ryegrass (Lolium perenne) in the field under elevated (60 Pa) and current (36 Pa) partial pressures of CO₂ (pCO2) at low and high levels of N fertilization. Cutting of this herbage crop at 4- to 8-week intervals removed about 80% of the canopy, therefore decreasing the ratio of photosynthetic area to sinks for photoassimilate. Leaf photosynthesis, in vivo carboxylation capacity, carbohydrate, N, ribulose-1,5-bisphosphate carboxylase/oxygenase, sedohepulose-1,7-bisphosphate, and chloroplastic fructose-1,6-bisphosphatase levels were determined for mature lamina during two consecutive summers. Just before the cut, when the canopy was relatively large, growth at elevated pCO₂ and low N resulted in significant decreases in carboxylation capacity and the amount of ribulose-1,5 bisphosphate carboxlase/oxygenase protein. In high N there iwere no sinificant decreases in carboxylation capacity or proteins, but chloroplastic fructose-1,6-bisphosphatase protein levels increased significantly. Elevated pCO₂ resulted in a marked and significant increase in leaf carbohydrate content at low N, but had no effect at high N. This acclimation at low N was absent after the harvest, when the canopy size was small. These results suggest that acclimation under low N is caused by limitation of sink development rather than being a direct effect of N supply on photosynthesis." |
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| Language: | English |
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| References: | 37 |
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| See Also: | Other items relating to: Carbon sequestration of turf |
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| Note: | Figures |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Rogers, A., B. U. Fischer, J. Bryant, M. Frehner, H. Blum, C. A. Raines, et al. 1998. Acclimation of photosynthesis to elevated CO₂ under low-nitrogen nutrition is affected by the capacity for assimilate utilization. Perennial ryegrass under free-air CO₂ enrichment. Plant Physiol. 118(2):p. 683-689. |
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