Effects of atmospheric CO/sub 2/ concentration and water stress on water relations of wheat
Water status and growth responses of wheat (Triticum aestivuum L. (GWO-1809)) to increased CO/sub 2/ concentration and water stress were studied in controlled-environment chambers. Plants were grown in 350 ..mu..l/liter or 1000 ..mu..1/liter CO/sub 2/ at similar temperature, irradiance, and photoperiod conditions. Groups of plants were subjected to water stress by withholding irrigation for one or two cycles of treatment. In most treatments, decreasing leaf water potential was correlated with decreasing osmotic potential. In leaves grown in both low and high CO/sub 2/ concentrations, the osmotic potentials were lower during the second stress cycle than during the first cycle. The stomata of plants in the low CO/sub 2/ concentration closed at a higher leaf water potential than those in the high CO/sub 2/ concentration. Stem and head production was greater in plants grown in high CO/sub 2/ concentrations than those grown in low CO/sub 2/, perhaps the result of turgor-pressure maintenance as leaf water potential decreased. In controlled-environment chambers, wheat plants adapted to water stress, apparently because of high CO/sub 2/ concentration and repeated stress cycles.
- Research Organization:
- Duke Univ., Durham, NC
- OSTI ID:
- 6119501
- Journal Information:
- Bot. Gaz. (Chicago); (United States), Vol. 142:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BIOLOGICAL STRESS
BIOLOGICAL EFFECTS
CARBON DIOXIDE
WHEAT
PRODUCTIVITY
LEAVES
OSMOSIS
PHOTOSYNTHESIS
PLANT GROWTH
QUANTITY RATIO
SOILS
WATER
CARBON COMPOUNDS
CARBON OXIDES
CEREALS
CHALCOGENIDES
CHEMICAL REACTIONS
DIFFUSION
GRAMINEAE
GRASS
GROWTH
HYDROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PLANTS
SYNTHESIS
560303* - Chemicals Metabolism & Toxicology- Plants- (-1987)