[open quotes]Interactive effects of O[sub 3] and CO[sub 2] enrichment on photosynthetic acclimation. II. Non-biochemical limitations[close quotes]
- North Carolina State Univ., Raleigh, NC (United States)
Non-biochemical limitations in photosynthetic acclimation to elevated atmospheric CO[sub 2] and O[sub 3] may be partitioned between stomatal diffusion and energy capture. To determine the importance of these limitations on the mechanisms of photosynthetic acclimation, soybean (Glycine max) plants were grown in a 4 CO[sub 2] [times] 3 O[sub 3] combination in open-top field chambers for one growing seasons. Midday stomatal conductance was measured in the field at regular intervals through the season. Chlorophyll fluorescence measurements were made both in situ on leaf discs in the lab. Stomatal conductance was highest in ambient CO[sub 2] [times] charcoaled-filtered air (2.4 cm.s[sup [minus]1]) and decreased with increasing CO[sub 2] and/or O[sub 3], the lowest conductance being in high CO[sub 2] [times] 1.5 O[sub 3] (50% of control). Quantum efficiency was significantly reduced by O[sub 3] (72% of control) and although it was also reduced somewhat by high CO[sub 2] (90% of control), in combination the reductions due to O[sub 3] exposure lost statistical significance, indicating that high CO[sub 2] moderated this aspect of O[sub 3] damage. A shift among non-biochemical limitations of photosynthesis is suggested when plants are exposed to a combination of these trace gases.
- OSTI ID:
- 7272418
- Report Number(s):
- CONF-940894-; CODEN: BECLAG
- Journal Information:
- Bulletin of the Ecological Society of America; (United States), Vol. 75:2; Conference: Annual Ecological Society of America (ESA) meeting: science and public policy, Knoxville, TN (United States), 7-11 Aug 1994; ISSN 0012-9623
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CARBON DIOXIDE
BIOLOGICAL EFFECTS
ECOLOGICAL CONCENTRATION
OZONE
SOYBEANS
BIOLOGICAL ADAPTATION
PHOTOSYNTHESIS
EXPOSURE CHAMBERS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
FOOD
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PLANTS
SYNTHESIS
VEGETABLES
560300* - Chemicals Metabolism & Toxicology