Effects of high atmospheric CO/sub 2/ and sink size on rates of photosynthesis of a soybean cultivar
The effect of sink strength on photosynthetic rates under conditions of long-term exposure to high CO/sub 2/ has been investigated in soybean. Soybean plants were grown in growth chambers. At that time, plants were trimmed to three trifoliolate leaves and either 21 pods (high sink treatment) or 6 pods (low sink treatment). Trimmed plants were either left in 350 microliters CO/sub 2/ per liter of air or placed in 1000 microliters CO/sub 2/ per liter of air (high CO/sub 2/ treatment) until pod maturity. Plants were also harvested at this time for dry weight measurements. Photosynthetic rates of high sink plants at both measurement CO/sub 2/ concentrations were consistently higher than those of low sink plants, and those of plants given the 350 microliter CO/sub 2/ per liter of air treatment were higher at both measurement CO/sub 2/ concentrations than those of plants given the 1000 microliters CO/sub 2/ per liter of air treatment. Dry weights of all plant parts were higher in the 1000 microliters CO/sub 2/ per liter air treatment than in the 350 microliters CO/sub 2/ per liter air treatment, and were higher in the low sink than in the high sink treatments.
- Research Organization:
- Duke Univ., Durham, NC
- OSTI ID:
- 6408191
- Journal Information:
- Plant Physiol.; (United States), Journal Name: Plant Physiol.; (United States) Vol. 67:5; ISSN PLPHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
560303* -- Chemicals Metabolism & Toxicology-- Plants-- (-1987)
59 BASIC BIOLOGICAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BIOCHEMICAL REACTION KINETICS
BIOLOGICAL EFFECTS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
EXPOSURE CHAMBERS
GLYCINE HISPIDA
KINETICS
LEGUMINOSAE
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PLANTS
REACTION KINETICS
SYNTHESIS
WEIGHT