Leaf anatomy of four species grown under continuous CO/sub 2/ enrichment
The effects of continuous, atmospheric CO/sub 2/ enrichment on leaf anatomy and morphology were examined for corn, soybean, loblolly pine, and sweet gum. Plants were exposed to constantly monitored CO/sub 2/ levels of 340, 520, 718, and 910 ppM throughout the growing season in the field. Samples obtained from fully expanded leaves were subjected to routine anatomical procedures, sectioned transversely at 10 ..mu..m, and measured for total thickness and thicknesses of epidermal, palisade, and spongy mesophyll layers. Epidermal peels and scanning electron microscopy were used to observe possible changes in leaf surfaces. Significant increases were measured in leaf thickness for the three C/sub 3/, species under enriched CO/sub 2/ conditions, but not for corn, a C/sub 4/ plant. The influence of CO/sub 2/ treatment on changes in stomatal indices was not significant, and there were no clear patterns in variation of stomatal frequency among treatments. Chloroplasts in leaf tissues of plants from CO/sub 2/-enriched treatments appeared denser and were more deeply stained by the crystal violet. 19 refs., 5 figs., 5 tabs.
- Research Organization:
- Department of Botany, North Carolina State University, Raleigh, North Carolina 27650
- OSTI ID:
- 6328554
- Journal Information:
- Bot. Gaz. (Chicago); (United States), Journal Name: Bot. Gaz. (Chicago); (United States) Vol. 144:3; ISSN BOGAA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION
ANATOMY
BIOLOGICAL EFFECTS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CEREALS
CHALCOGENIDES
CONIFERS
DOSE-RESPONSE RELATIONSHIPS
ELECTRON MICROSCOPY
ENRICHMENT
FOOD
GRASS
GREENHOUSE EFFECT
LEAVES
LILIOPSIDA
MAGNOLIOPHYTA
MAIZE
MICROSCOPY
MODIFICATIONS
OPENINGS
OXIDES
OXYGEN COMPOUNDS
PINES
PINOPHYTA
PLANTS
POLLUTION
QUANTITY RATIO
SCANNING ELECTRON MICROSCOPY
SOYBEANS
STOMATA
TREES
VEGETABLES