Effect of the long-term elevation of CO sub 2 concentration in the field on the quantum yield of photosynthesis of the C sub 3 sedge, Scirpus olneyi
- Univ. of Essex, Colchester (United Kingdom)
- Smithsonian Environmental Research Center, Edgewater, MD (United States)
CO{sub 2} concentration was elevated throughout 3 years around stands of the C{sub 3} sedge Scirpus olneyi on a tidal marsh of the Chesapeake Bay. The hypothesis that tissues developed in an elevated CO{sub 2} atmosphere will show an acclimatory decrease in photosynthetic capacity under light-limiting conditions was examined. The absorbed light quantum yield of CO{sub 2} uptake ({phi}{sub abs}) and the efficiency of photosystem II photochemistry were determined for plants which had developed in open top chambers with CO{sub 2} concentrations in air of 680 micromoles per mole, and of 351 micromoles per mole as controls. When measured in an atmosphere with 10 millimoles per mole O{sub 2} to suppress photorespiration, shoots showed a {phi}{sub abs} of 0.093 {plus minus} 0.003, with no statistically significant difference between shoots grown in elevated or control CO{sub 2} concentration. Efficiency of photosystem II photochemistry was also unchanged by development in an elevated CO{sub 2} atmosphere. Shoots grown and measured in 680 micromoles per mole of CO{sub 2} in air showed a {phi}{sub abs} of 0.078 {plus minus} 0.004 compared with 0.065 {plus minus} for leaves grown and measured in 351 micromoles per mole CO{sub 2} in air; a highly significant increase. In accordance with the change in {phi}{sub abs}, the light compensation point of photosynthesis decreased from 51 {plus minus} 3 to 31 {plus minus} 3 micromoles per square meter per second for stems grown and measured in 351 and 680 micromoles per mole of CO{sub 2} in air, respectively.
- OSTI ID:
- 7110440
- Journal Information:
- Plant Physiology; (United States), Vol. 96:1; ISSN 0032-0889
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
01 COAL, LIGNITE, AND PEAT
CALVIN CYCLE SPECIES
PHOTOSYNTHESIS
CARBON DIOXIDE
BIOLOGICAL EFFECTS
CHESAPEAKE BAY
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHETIC REACTION CENTERS
STIMULATION
WETLANDS
AQUATIC ECOSYSTEMS
ATLANTIC OCEAN
BAYS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COASTAL WATERS
ECOSYSTEMS
OXIDES
OXYGEN COMPOUNDS
PLANTS
SEAS
SURFACE WATERS
SYNTHESIS
560300* - Chemicals Metabolism & Toxicology
540120 - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)
010900 - Coal
Lignite
& Peat- Environmental Aspects