Effect of temperature on the occurrence of O/sub 2/ and CO/sub 2/ insensitive photosynthesis in field grown plants. [Phaselous vulgaris; capsicum annum; lycopersicon esculentum; scrophularia desertorum; cardaria]
Conference
·
· Plant Physiol., Suppl.; (United States)
OSTI ID:5600888
The sensitivity of photosynthesis to O/sub 2/ and CO/sub 2/ was measured in field grown plants of six species (Phaseolus vulgaris, Capsicum annum, Lycopersicon esculentum, Scrophularia desertorum, Cardaria draba and Populus Fremontii) from 5/sup 0/C to 35/sup 0/C. Photosynthesis was insensitive to O/sub 2/ in normal air below a species dependent temperature. CO/sub 2/ insensitivity occurred under the same conditions that resulted in O/sub 2/ insensitivity. A complete loss of O/sub 2/ sensitivity was observed up to 22/sup 0/C (in Lycopersicon) but only up to 6/sup 0/C (in Scrophularia). In Lycopersicon and Populus, O/sub 2/ and CO/sub 2/ insensitivity occurred under conditions regularly encountered during the cooler portions of the day. The authors believe that O/sub 2/ insensitivity is an indicator of feedback limited photosynthesis, and that these results indicate that feedback limitations can play a role in determining plant carbon gain in the field. At higher partial pressures of CO/sub 2/ the temperature at which O/sub 2/ insensitivity occurred was higher, indicating that feedback limitations in the field will become more important as the CO/sub 2/ concentration in the atmosphere increases.
- Research Organization:
- Desert Research Institute, Reno, NV
- OSTI ID:
- 5600888
- Report Number(s):
- CONF-8707108-
- Conference Information:
- Journal Name: Plant Physiol., Suppl.; (United States) Journal Volume: 83:4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
560300* -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BACTERIA
BIOLOGICAL EFFECTS
CAPSICUM
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COTTONWOODS
ELEMENTS
FEEDBACK
HERBS
LEGUMINOSAE
MICROORGANISMS
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHASEOLUS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PLANTS
RHIZOBIUM
SYNTHESIS
TEMPERATURE EFFECTS
TREES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BACTERIA
BIOLOGICAL EFFECTS
CAPSICUM
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COTTONWOODS
ELEMENTS
FEEDBACK
HERBS
LEGUMINOSAE
MICROORGANISMS
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHASEOLUS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PLANTS
RHIZOBIUM
SYNTHESIS
TEMPERATURE EFFECTS
TREES